CVE-2026-90071 (GCVE-0-2026-90071)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:05 – Updated: 2026-09-18 17:52
VLAI
Title
net/sched: sch_teql: restore skb->dev on the slave failure path
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_teql: restore skb->dev on the slave failure path teql_master_xmit() sets skb->dev = slave before calling the slave's ndo_start_xmit(), but never restores it when that transmit fails. The skb then walks on to the next slave still pointing at the previous one. If a later slave has no resolved neighbour, teql_resolve() hands the skb to neigh_event_send(), which queues it on that neighbour's arp_queue with the stale skb->dev. skb->dev holds no reference, so deleting the previous slave frees the net_device while the skb is still queued. Whatever runs next on that skb - arp_error_report() on timeout, or neigh_direct_output() -> dev_queue_xmit() once the neighbour resolves - causes a UAF like the one below: BUG: KASAN: slab-use-after-free in __icmp_send (net/ipv4/icmp.c:914 (discriminator 2)) Read of size 4 at addr ffff888106e100b0 by task flood_packet/527 CPU: 0 UID: 0 PID: 527 Comm: flood_packet Not tainted 7.2.0-rc6-g594d90519502 #1 PREEMPT(lazy) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: <IRQ> dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) ? __pfx__raw_spin_lock_irqsave (./include/asm-generic/qrwlock.h:122 (discriminator 4)) ? __icmp_send (net/ipv4/icmp.c:914 (discriminator 2)) kasan_report (mm/kasan/report.c:595) ? __icmp_send (net/ipv4/icmp.c:914 (discriminator 2)) __icmp_send (net/ipv4/icmp.c:914 (discriminator 2)) [...] ipv4_link_failure (net/ipv4/route.c:1251 net/ipv4/route.c:1258) ? __pfx_ipv4_link_failure (./include/linux/skbuff.h:4327) ? _raw_write_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qrwlock.h:98 ./include/linux/rwlock_api_smp.h:230 kernel/locking/spinlock.c:304) ? __pfx__raw_write_lock (kernel/locking/spinlock.c:175) arp_error_report (./include/net/dst.h:438 net/ipv4/arp.c:296) neigh_invalidate (net/core/neighbour.c:1077) neigh_timer_handler (net/core/neighbour.c:1169) [...] Allocated by task 505: kasan_save_stack (mm/kasan/common.c:57) kasan_save_track (mm/kasan/common.c:78) __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415) __kvmalloc_node_noprof (./include/linux/kasan.h:263 mm/slub.c:5334 mm/slub.c:6905) alloc_netdev_mqs (net/core/dev.c:12055 (discriminator 2)) rtnl_create_link (net/core/rtnetlink.c:3721) rtnl_newlink (net/core/rtnetlink.c:3903 net/core/rtnetlink.c:4044 net/core/rtnetlink.c:4159) rtnetlink_rcv_msg (net/core/rtnetlink.c:7076) [...] Freed by task 536: kasan_save_stack (mm/kasan/common.c:57) kasan_save_track (mm/kasan/common.c:78) kasan_save_free_info (mm/kasan/generic.c:584) __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) kfree (./include/linux/kasan.h:235 mm/slub.c:2677 mm/slub.c:6377 mm/slub.c:6692) device_release (drivers/base/core.c:2636) kobject_put (lib/kobject.c:689 lib/kobject.c:720 ./include/linux/kref.h:65 lib/kobject.c:737) netdev_run_todo (net/core/dev.c:11756) rtnl_dellink (net/core/rtnetlink.c:157 ./include/linux/rtnetlink.h:135 net/core/rtnetlink.c:3651) rtnetlink_rcv_msg (net/core/rtnetlink.c:7076) [...] Fix this by restoring skb->dev to the master at the end of each slave's iteration.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 383493b9940e3d1b5517424081b3e072e20ec43c , < 1360bc93f5be1be3cf937ebea667b3418dd30a79 (git)
Affected: 6b1f563d670162e188a0f2aec39c24b67b106e17 , < d453bf439ef230b5743afc25e194adacca8c6e43 (git)
Affected: 57c153249143333bbf4ecf927bdf8aa2696ee397 , < 012559cf3c67ce8825a31d4f66b040b6fbaf775e (git)
Affected: 59b06d8b9bdb6b64b3c534c18da68bce5ccd31be , < aa39a790d56b40bfcf3861653ceb46a3a113adb6 (git)
Affected: 81a43e8005366f16e629d8c95dfe05beaa8d36a7 , < 00d8a387b23b7831ad9919256a6b9caaa10f19c3 (git)
Affected: 0bad9c86edd22dec4df83c2b29872d66fd8a2ff4 , < 96bc345a3f17543d0d92ada609e02198d6380e26 (git)
Affected: 0cc0c2e661af418bbf7074179ea5cfffc0a5c466 , < 0cd75037948567193f7f5767176538822ce23873 (git)
Affected: 0cc0c2e661af418bbf7074179ea5cfffc0a5c466 , < dc4b95b8fee95113587e93ca116356032d271371 (git)
Affected: 21ea283c2750c8307aa35ee832b0951cc993c27d (git)
Affected: 5.10.253 , < 5.10.270 (semver)
Affected: 5.15.203 , < 5.15.221 (semver)
Affected: 6.1.167 , < 6.1.188 (semver)
Affected: 6.6.130 , < 6.6.157 (semver)
Affected: 6.12.78 , < 6.12.110 (semver)
Affected: 6.18.19 , < 6.18.52 (semver)
Affected: 6.19.9 , < 6.20 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_teql.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1360bc93f5be1be3cf937ebea667b3418dd30a79",
              "status": "affected",
              "version": "383493b9940e3d1b5517424081b3e072e20ec43c",
              "versionType": "git"
            },
            {
              "lessThan": "d453bf439ef230b5743afc25e194adacca8c6e43",
              "status": "affected",
              "version": "6b1f563d670162e188a0f2aec39c24b67b106e17",
              "versionType": "git"
            },
            {
              "lessThan": "012559cf3c67ce8825a31d4f66b040b6fbaf775e",
              "status": "affected",
              "version": "57c153249143333bbf4ecf927bdf8aa2696ee397",
              "versionType": "git"
            },
            {
              "lessThan": "aa39a790d56b40bfcf3861653ceb46a3a113adb6",
              "status": "affected",
              "version": "59b06d8b9bdb6b64b3c534c18da68bce5ccd31be",
              "versionType": "git"
            },
            {
              "lessThan": "00d8a387b23b7831ad9919256a6b9caaa10f19c3",
              "status": "affected",
              "version": "81a43e8005366f16e629d8c95dfe05beaa8d36a7",
              "versionType": "git"
            },
            {
              "lessThan": "96bc345a3f17543d0d92ada609e02198d6380e26",
              "status": "affected",
              "version": "0bad9c86edd22dec4df83c2b29872d66fd8a2ff4",
              "versionType": "git"
            },
            {
              "lessThan": "0cd75037948567193f7f5767176538822ce23873",
              "status": "affected",
              "version": "0cc0c2e661af418bbf7074179ea5cfffc0a5c466",
              "versionType": "git"
            },
            {
              "lessThan": "dc4b95b8fee95113587e93ca116356032d271371",
              "status": "affected",
              "version": "0cc0c2e661af418bbf7074179ea5cfffc0a5c466",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "21ea283c2750c8307aa35ee832b0951cc993c27d",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.270",
              "status": "affected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.221",
              "status": "affected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.188",
              "status": "affected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.157",
              "status": "affected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.110",
              "status": "affected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.52",
              "status": "affected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.9",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_teql.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.10.253",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.15.203",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "6.1.167",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.6.130",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.12.78",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.18.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.19.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_teql: restore skb-\u003edev on the slave failure path\n\nteql_master_xmit() sets skb-\u003edev = slave before calling the slave\u0027s\nndo_start_xmit(), but never restores it when that transmit fails. The\nskb then walks on to the next slave still pointing at the previous one.\n\nIf a later slave has no resolved neighbour, teql_resolve() hands the skb\nto neigh_event_send(), which queues it on that neighbour\u0027s arp_queue\nwith the stale skb-\u003edev. skb-\u003edev holds no reference, so deleting the\nprevious slave frees the net_device while the skb is still queued.\nWhatever runs next on that skb - arp_error_report() on timeout, or\nneigh_direct_output() -\u003e dev_queue_xmit() once the neighbour resolves -\ncauses a UAF like the one below:\n\nBUG: KASAN: slab-use-after-free in __icmp_send (net/ipv4/icmp.c:914 (discriminator 2))\nRead of size 4 at addr ffff888106e100b0 by task flood_packet/527\nCPU: 0 UID: 0 PID: 527 Comm: flood_packet Not tainted 7.2.0-rc6-g594d90519502 #1 PREEMPT(lazy)\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n\u003cIRQ\u003e\ndump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)\nprint_report (mm/kasan/report.c:378 mm/kasan/report.c:482)\n? __pfx__raw_spin_lock_irqsave (./include/asm-generic/qrwlock.h:122 (discriminator 4))\n? __icmp_send (net/ipv4/icmp.c:914 (discriminator 2))\nkasan_report (mm/kasan/report.c:595)\n? __icmp_send (net/ipv4/icmp.c:914 (discriminator 2))\n__icmp_send (net/ipv4/icmp.c:914 (discriminator 2))\n[...]\nipv4_link_failure (net/ipv4/route.c:1251 net/ipv4/route.c:1258)\n? __pfx_ipv4_link_failure (./include/linux/skbuff.h:4327)\n? _raw_write_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qrwlock.h:98 ./include/linux/rwlock_api_smp.h:230 kernel/locking/spinlock.c:304)\n? __pfx__raw_write_lock (kernel/locking/spinlock.c:175)\narp_error_report (./include/net/dst.h:438 net/ipv4/arp.c:296)\nneigh_invalidate (net/core/neighbour.c:1077)\nneigh_timer_handler (net/core/neighbour.c:1169)\n[...]\nAllocated by task 505:\nkasan_save_stack (mm/kasan/common.c:57)\nkasan_save_track (mm/kasan/common.c:78)\n__kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415)\n__kvmalloc_node_noprof (./include/linux/kasan.h:263 mm/slub.c:5334 mm/slub.c:6905)\nalloc_netdev_mqs (net/core/dev.c:12055 (discriminator 2))\nrtnl_create_link (net/core/rtnetlink.c:3721)\nrtnl_newlink (net/core/rtnetlink.c:3903 net/core/rtnetlink.c:4044 net/core/rtnetlink.c:4159)\nrtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n[...]\nFreed by task 536:\nkasan_save_stack (mm/kasan/common.c:57)\nkasan_save_track (mm/kasan/common.c:78)\nkasan_save_free_info (mm/kasan/generic.c:584)\n__kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285)\nkfree (./include/linux/kasan.h:235 mm/slub.c:2677 mm/slub.c:6377 mm/slub.c:6692)\ndevice_release (drivers/base/core.c:2636)\nkobject_put (lib/kobject.c:689 lib/kobject.c:720 ./include/linux/kref.h:65 lib/kobject.c:737)\nnetdev_run_todo (net/core/dev.c:11756)\nrtnl_dellink (net/core/rtnetlink.c:157 ./include/linux/rtnetlink.h:135 net/core/rtnetlink.c:3651)\nrtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n[...]\n\nFix this by restoring skb-\u003edev to the master at the end of each slave\u0027s\niteration."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - teql_master_xmit() itself writes skb-\u003edev to the slave, and the UAF is completed by a local RTM_DELLINK (rtnl_dellink \u2192 netdev_run_todo) of that slave while the skb sits on another slave\u0027s arp_queue; the packet reaches teql_master_xmit via sendto/udp_sendmsg \u2192 ip_finish_output2 \u2192 __dev_queue_xmit on teql0, not via a remote protocol field.\nAC:L - The attacker chooses the slaves, sends on teql0 so teql_master_xmit() leaves skb-\u003edev on a failed ndo_start_xmit/netif_xmit_frozen_or_stopped slave, then teql_resolve()/neigh_event_send() queues that skb for an unresolved neighbour, then issues RTM_DELLINK; flood_packet plus an unanswered ARP destination make this repeatable without third-party timing.\nPR:L - RTM_NEWLINK, RTM_NEWQDISC (tc_modify_qdisc \u2192 teql_qdisc_init) and the freeing RTM_DELLINK all go through rtnetlink_rcv_msg(), which requires netlink_net_capable(skb, CAP_NET_ADMIN) against sock_net(skb-\u003esk)-\u003euser_ns; unshare -Urn grants that namespaced capability without init-namespace root.\nUI:N - The attacker alone creates the slaves, grafts the teql0 qdisc, injects packets into teql_master_xmit(), and deletes the stale skb-\u003edev slave with RTM_DELLINK; no other user must open a file, mount a volume, or otherwise act.\nS:U - The freed object is a kernel net_device from alloc_netdev_mqs()/rtnl_newlink, used later on the same host via skb-\u003edev in __icmp_send() or dev_queue_xmit(); this is in-kernel memory corruption, not a VM, IOMMU, or hypervisor boundary crossing.\nC:H - KASAN reports a slab-use-after-free read of the freed net_device in __icmp_send() (skb_in-\u003edev-\u003eflags) from arp_error_report(); the same dangling skb-\u003edev is consumed by neigh_direct_output() \u2192 dev_queue_xmit(), and reclaim of that slab object yields an arbitrary kernel read.\nI:H - Once the neighbour resolves, neigh_update_process_arp_queue() calls neigh_direct_output() \u2192 dev_queue_xmit() on the dangling skb-\u003edev, so a reclaimed net_device\u0027s netdev_ops (ndo_start_xmit) become attacker-controlled, giving an arbitrary kernel write and control-flow hijack.\nA:H - The reported path is neigh_timer_handler() \u2192 neigh_invalidate() \u2192 arp_error_report() \u2192 ipv4_link_failure() \u2192 __icmp_send() hitting a KASAN slab-use-after-free of the deleted slave net_device, which oopses/panics the kernel even without further exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:52:54.125Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1360bc93f5be1be3cf937ebea667b3418dd30a79"
        },
        {
          "url": "https://git.kernel.org/stable/c/d453bf439ef230b5743afc25e194adacca8c6e43"
        },
        {
          "url": "https://git.kernel.org/stable/c/012559cf3c67ce8825a31d4f66b040b6fbaf775e"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa39a790d56b40bfcf3861653ceb46a3a113adb6"
        },
        {
          "url": "https://git.kernel.org/stable/c/00d8a387b23b7831ad9919256a6b9caaa10f19c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/96bc345a3f17543d0d92ada609e02198d6380e26"
        },
        {
          "url": "https://git.kernel.org/stable/c/0cd75037948567193f7f5767176538822ce23873"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc4b95b8fee95113587e93ca116356032d271371"
        }
      ],
      "title": "net/sched: sch_teql: restore skb-\u003edev on the slave failure path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90071",
    "datePublished": "2026-09-17T16:05:52.245Z",
    "dateReserved": "2026-09-11T19:38:34.784Z",
    "dateUpdated": "2026-09-18T17:52:54.125Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-90071",
      "date": "2026-09-25",
      "epss": "0.00171",
      "percentile": "0.05713"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-23T02:55:10.000Z",
      "cve": "CVE-2026-90071",
      "id": "msrc_CVE-2026-90071",
      "initial_release_date": "2026-09-19T01:05:16.000Z",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/sched: sch_teql: restore skb-\u003edev on the slave failure path",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90071.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/sched/sch_teql.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "1360bc93f5be1be3cf937ebea667b3418dd30a79",
                    "status": "affected",
                    "version": "383493b9940e3d1b5517424081b3e072e20ec43c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "d453bf439ef230b5743afc25e194adacca8c6e43",
                    "status": "affected",
                    "version": "6b1f563d670162e188a0f2aec39c24b67b106e17",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "012559cf3c67ce8825a31d4f66b040b6fbaf775e",
                    "status": "affected",
                    "version": "57c153249143333bbf4ecf927bdf8aa2696ee397",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "aa39a790d56b40bfcf3861653ceb46a3a113adb6",
                    "status": "affected",
                    "version": "59b06d8b9bdb6b64b3c534c18da68bce5ccd31be",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "00d8a387b23b7831ad9919256a6b9caaa10f19c3",
                    "status": "affected",
                    "version": "81a43e8005366f16e629d8c95dfe05beaa8d36a7",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "96bc345a3f17543d0d92ada609e02198d6380e26",
                    "status": "affected",
                    "version": "0bad9c86edd22dec4df83c2b29872d66fd8a2ff4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "0cd75037948567193f7f5767176538822ce23873",
                    "status": "affected",
                    "version": "0cc0c2e661af418bbf7074179ea5cfffc0a5c466",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "dc4b95b8fee95113587e93ca116356032d271371",
                    "status": "affected",
                    "version": "0cc0c2e661af418bbf7074179ea5cfffc0a5c466",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "21ea283c2750c8307aa35ee832b0951cc993c27d",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5.10.270",
                    "status": "affected",
                    "version": "5.10.253",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "5.15.221",
                    "status": "affected",
                    "version": "5.15.203",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.1.188",
                    "status": "affected",
                    "version": "6.1.167",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.6.157",
                    "status": "affected",
                    "version": "6.6.130",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.12.110",
                    "status": "affected",
                    "version": "6.12.78",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.18.52",
                    "status": "affected",
                    "version": "6.18.19",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.20",
                    "status": "affected",
                    "version": "6.19.9",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/sched/sch_teql.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "7.0"
                  },
                  {
                    "lessThan": "7.0",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.270",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.221",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.188",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.157",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.110",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.52",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_teql: restore skb-\u003edev on the slave failure path\n\nteql_master_xmit() sets skb-\u003edev = slave before calling the slave\u0027s\nndo_start_xmit(), but never restores it when that transmit fails. The\nskb then walks on to the next slave still pointing at the previous one.\n\nIf a later slave has no resolved neighbour, teql_resolve() hands the skb\nto neigh_event_send(), which queues it on that neighbour\u0027s arp_queue\nwith the stale skb-\u003edev. skb-\u003edev holds no reference, so deleting the\nprevious slave frees the net_device while the skb is still queued.\nWhatever runs next on that skb - arp_error_report() on timeout, or\nneigh_direct_output() -\u003e dev_queue_xmit() once the neighbour resolves -\ncauses a UAF like the one below:\n\nBUG: KASAN: slab-use-after-free in __icmp_send (net/ipv4/icmp.c:914 (discriminator 2))\nRead of size 4 at addr ffff888106e100b0 by task flood_packet/527\nCPU: 0 UID: 0 PID: 527 Comm: flood_packet Not tainted 7.2.0-rc6-g594d90519502 #1 PREEMPT(lazy)\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n\u003cIRQ\u003e\ndump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)\nprint_report (mm/kasan/report.c:378 mm/kasan/report.c:482)\n? __pfx__raw_spin_lock_irqsave (./include/asm-generic/qrwlock.h:122 (discriminator 4))\n? __icmp_send (net/ipv4/icmp.c:914 (discriminator 2))\nkasan_report (mm/kasan/report.c:595)\n? __icmp_send (net/ipv4/icmp.c:914 (discriminator 2))\n__icmp_send (net/ipv4/icmp.c:914 (discriminator 2))\n[...]\nipv4_link_failure (net/ipv4/route.c:1251 net/ipv4/route.c:1258)\n? __pfx_ipv4_link_failure (./include/linux/skbuff.h:4327)\n? _raw_write_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qrwlock.h:98 ./include/linux/rwlock_api_smp.h:230 kernel/locking/spinlock.c:304)\n? __pfx__raw_write_lock (kernel/locking/spinlock.c:175)\narp_error_report (./include/net/dst.h:438 net/ipv4/arp.c:296)\nneigh_invalidate (net/core/neighbour.c:1077)\nneigh_timer_handler (net/core/neighbour.c:1169)\n[...]\nAllocated by task 505:\nkasan_save_stack (mm/kasan/common.c:57)\nkasan_save_track (mm/kasan/common.c:78)\n__kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415)\n__kvmalloc_node_noprof (./include/linux/kasan.h:263 mm/slub.c:5334 mm/slub.c:6905)\nalloc_netdev_mqs (net/core/dev.c:12055 (discriminator 2))\nrtnl_create_link (net/core/rtnetlink.c:3721)\nrtnl_newlink (net/core/rtnetlink.c:3903 net/core/rtnetlink.c:4044 net/core/rtnetlink.c:4159)\nrtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n[...]\nFreed by task 536:\nkasan_save_stack (mm/kasan/common.c:57)\nkasan_save_track (mm/kasan/common.c:78)\nkasan_save_free_info (mm/kasan/generic.c:584)\n__kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285)\nkfree (./include/linux/kasan.h:235 mm/slub.c:2677 mm/slub.c:6377 mm/slub.c:6692)\ndevice_release (drivers/base/core.c:2636)\nkobject_put (lib/kobject.c:689 lib/kobject.c:720 ./include/linux/kref.h:65 lib/kobject.c:737)\nnetdev_run_todo (net/core/dev.c:11756)\nrtnl_dellink (net/core/rtnetlink.c:157 ./include/linux/rtnetlink.h:135 net/core/rtnetlink.c:3651)\nrtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n[...]\n\nFix this by restoring skb-\u003edev to the master at the end of each slave\u0027s\niteration."
          }
        ],
        "id": "CVE-2026-90071",
        "lastModified": "2026-09-18T18:17:40.850",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-17T17:16:56.073",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/00d8a387b23b7831ad9919256a6b9caaa10f19c3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/012559cf3c67ce8825a31d4f66b040b6fbaf775e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0cd75037948567193f7f5767176538822ce23873"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1360bc93f5be1be3cf937ebea667b3418dd30a79"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/96bc345a3f17543d0d92ada609e02198d6380e26"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/aa39a790d56b40bfcf3861653ceb46a3a113adb6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d453bf439ef230b5743afc25e194adacca8c6e43"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dc4b95b8fee95113587e93ca116356032d271371"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-21T16:34:05Z",
      "cve": "CVE-2026-90071",
      "id": "CVE-2026-90071",
      "initial_release_date": "2026-09-18T00:21:59Z",
      "product_status:known_affected": "163",
      "product_status:known_not_affected": "184",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90071",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90071.json",
      "version": "4"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.