CVE-2026-22976 (GCVE-0-2026-22976)

Vulnerability from cvelistv5 – Published: 2026-01-21 06:57 – Updated: 2026-01-21 06:57
VLAI?
Title
net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset `qfq_class->leaf_qdisc->q.qlen > 0` does not imply that the class itself is active. Two qfq_class objects may point to the same leaf_qdisc. This happens when: 1. one QFQ qdisc is attached to the dev as the root qdisc, and 2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get() / qdisc_put()) and is pending to be destroyed, as in function tc_new_tfilter. When packets are enqueued through the root QFQ qdisc, the shared leaf_qdisc->q.qlen increases. At the same time, the second QFQ qdisc triggers qdisc_put and qdisc_destroy: the qdisc enters qfq_reset() with its own q->q.qlen == 0, but its class's leaf qdisc->q.qlen > 0. Therefore, the qfq_reset would wrongly deactivate an inactive aggregate and trigger a null-deref in qfq_deactivate_agg: [ 0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 0.903571] #PF: supervisor write access in kernel mode [ 0.903860] #PF: error_code(0x0002) - not-present page [ 0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0 [ 0.904502] Oops: Oops: 0002 [#1] SMP NOPTI [ 0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE [ 0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 [ 0.905754] RIP: 0010:qfq_deactivate_agg (include/linux/list.h:992 (discriminator 2) include/linux/list.h:1006 (discriminator 2) net/sched/sch_qfq.c:1367 (discriminator 2) net/sched/sch_qfq.c:1393 (discriminator 2)) [ 0.906046] Code: 0f 84 4d 01 00 00 48 89 70 18 8b 4b 10 48 c7 c2 ff ff ff ff 48 8b 78 08 48 d3 e2 48 21 f2 48 2b 13 48 8b 30 48 d3 ea 8b 4b 18 0 Code starting with the faulting instruction =========================================== 0: 0f 84 4d 01 00 00 je 0x153 6: 48 89 70 18 mov %rsi,0x18(%rax) a: 8b 4b 10 mov 0x10(%rbx),%ecx d: 48 c7 c2 ff ff ff ff mov $0xffffffffffffffff,%rdx 14: 48 8b 78 08 mov 0x8(%rax),%rdi 18: 48 d3 e2 shl %cl,%rdx 1b: 48 21 f2 and %rsi,%rdx 1e: 48 2b 13 sub (%rbx),%rdx 21: 48 8b 30 mov (%rax),%rsi 24: 48 d3 ea shr %cl,%rdx 27: 8b 4b 18 mov 0x18(%rbx),%ecx ... [ 0.907095] RSP: 0018:ffffc900004a39a0 EFLAGS: 00010246 [ 0.907368] RAX: ffff8881043a0880 RBX: ffff888102953340 RCX: 0000000000000000 [ 0.907723] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 0.908100] RBP: ffff888102952180 R08: 0000000000000000 R09: 0000000000000000 [ 0.908451] R10: ffff8881043a0000 R11: 0000000000000000 R12: ffff888102952000 [ 0.908804] R13: ffff888102952180 R14: ffff8881043a0ad8 R15: ffff8881043a0880 [ 0.909179] FS: 000000002a1a0380(0000) GS:ffff888196d8d000(0000) knlGS:0000000000000000 [ 0.909572] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.909857] CR2: 0000000000000000 CR3: 0000000102993002 CR4: 0000000000772ef0 [ 0.910247] PKRU: 55555554 [ 0.910391] Call Trace: [ 0.910527] <TASK> [ 0.910638] qfq_reset_qdisc (net/sched/sch_qfq.c:357 net/sched/sch_qfq.c:1485) [ 0.910826] qdisc_reset (include/linux/skbuff.h:2195 include/linux/skbuff.h:2501 include/linux/skbuff.h:3424 include/linux/skbuff.h:3430 net/sched/sch_generic.c:1036) [ 0.911040] __qdisc_destroy (net/sched/sch_generic.c:1076) [ 0.911236] tc_new_tfilter (net/sched/cls_api.c:2447) [ 0.911447] rtnetlink_rcv_msg (net/core/rtnetlink.c:6958) [ 0.911663] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6861) [ 0.911894] netlink_rcv_skb (net/netlink/af_netlink.c:2550) [ 0.912100] netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344) [ 0.912296] ? __alloc_skb (net/core/skbuff.c:706) [ 0.912484] netlink_sendmsg (net/netlink/af ---truncated---
Severity ?
No CVSS data available.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 0545a3037773512d3448557ba048cebb73b3e4af , < 6116a83ec167d3ab1390cded854d237481f41b63 (git)
Affected: 0545a3037773512d3448557ba048cebb73b3e4af , < 0809c4bc06c9c961222df29f2eccfd449304056f (git)
Affected: 0545a3037773512d3448557ba048cebb73b3e4af , < cdb24200b043438a144df501f1ebbd926bb1a2c7 (git)
Affected: 0545a3037773512d3448557ba048cebb73b3e4af , < 11bf9134613f6c71fc0ff36c5d8d33856f6ae3bb (git)
Affected: 0545a3037773512d3448557ba048cebb73b3e4af , < 43497313d0da3e12b5cfcd97aa17bf48ee663f95 (git)
Affected: 0545a3037773512d3448557ba048cebb73b3e4af , < 51ffd447bc37bf1a5776b85523f51d2bc69977f6 (git)
Affected: 0545a3037773512d3448557ba048cebb73b3e4af , < c1d73b1480235731e35c81df70b08f4714a7d095 (git)
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    Linux Linux Affected: 3.0
Unaffected: 0 , < 3.0 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.161 , ≤ 6.1.* (semver)
Unaffected: 6.6.121 , ≤ 6.6.* (semver)
Unaffected: 6.12.66 , ≤ 6.12.* (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc5 , ≤ * (original_commit_for_fix)
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Show details on NVD website

{
  "containers": {
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              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.161",
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              "version": "6.6.121",
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.66",
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.6",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc5",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset\n\n`qfq_class-\u003eleaf_qdisc-\u003eq.qlen \u003e 0` does not imply that the class\nitself is active.\n\nTwo qfq_class objects may point to the same leaf_qdisc. This happens\nwhen:\n\n1. one QFQ qdisc is attached to the dev as the root qdisc, and\n\n2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get()\n/ qdisc_put()) and is pending to be destroyed, as in function\ntc_new_tfilter.\n\nWhen packets are enqueued through the root QFQ qdisc, the shared\nleaf_qdisc-\u003eq.qlen increases. At the same time, the second QFQ\nqdisc triggers qdisc_put and qdisc_destroy: the qdisc enters\nqfq_reset() with its own q-\u003eq.qlen == 0, but its class\u0027s leaf\nqdisc-\u003eq.qlen \u003e 0. Therefore, the qfq_reset would wrongly deactivate\nan inactive aggregate and trigger a null-deref in qfq_deactivate_agg:\n\n[    0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[    0.903571] #PF: supervisor write access in kernel mode\n[    0.903860] #PF: error_code(0x0002) - not-present page\n[    0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0\n[    0.904502] Oops: Oops: 0002 [#1] SMP NOPTI\n[    0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE\n[    0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n[    0.905754] RIP: 0010:qfq_deactivate_agg (include/linux/list.h:992 (discriminator 2) include/linux/list.h:1006 (discriminator 2) net/sched/sch_qfq.c:1367 (discriminator 2) net/sched/sch_qfq.c:1393 (discriminator 2))\n[    0.906046] Code: 0f 84 4d 01 00 00 48 89 70 18 8b 4b 10 48 c7 c2 ff ff ff ff 48 8b 78 08 48 d3 e2 48 21 f2 48 2b 13 48 8b 30 48 d3 ea 8b 4b 18 0\n\nCode starting with the faulting instruction\n===========================================\n   0:\t0f 84 4d 01 00 00    \tje     0x153\n   6:\t48 89 70 18          \tmov    %rsi,0x18(%rax)\n   a:\t8b 4b 10             \tmov    0x10(%rbx),%ecx\n   d:\t48 c7 c2 ff ff ff ff \tmov    $0xffffffffffffffff,%rdx\n  14:\t48 8b 78 08          \tmov    0x8(%rax),%rdi\n  18:\t48 d3 e2             \tshl    %cl,%rdx\n  1b:\t48 21 f2             \tand    %rsi,%rdx\n  1e:\t48 2b 13             \tsub    (%rbx),%rdx\n  21:\t48 8b 30             \tmov    (%rax),%rsi\n  24:\t48 d3 ea             \tshr    %cl,%rdx\n  27:\t8b 4b 18             \tmov    0x18(%rbx),%ecx\n\t...\n[    0.907095] RSP: 0018:ffffc900004a39a0 EFLAGS: 00010246\n[    0.907368] RAX: ffff8881043a0880 RBX: ffff888102953340 RCX: 0000000000000000\n[    0.907723] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n[    0.908100] RBP: ffff888102952180 R08: 0000000000000000 R09: 0000000000000000\n[    0.908451] R10: ffff8881043a0000 R11: 0000000000000000 R12: ffff888102952000\n[    0.908804] R13: ffff888102952180 R14: ffff8881043a0ad8 R15: ffff8881043a0880\n[    0.909179] FS:  000000002a1a0380(0000) GS:ffff888196d8d000(0000) knlGS:0000000000000000\n[    0.909572] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[    0.909857] CR2: 0000000000000000 CR3: 0000000102993002 CR4: 0000000000772ef0\n[    0.910247] PKRU: 55555554\n[    0.910391] Call Trace:\n[    0.910527]  \u003cTASK\u003e\n[    0.910638]  qfq_reset_qdisc (net/sched/sch_qfq.c:357 net/sched/sch_qfq.c:1485)\n[    0.910826]  qdisc_reset (include/linux/skbuff.h:2195 include/linux/skbuff.h:2501 include/linux/skbuff.h:3424 include/linux/skbuff.h:3430 net/sched/sch_generic.c:1036)\n[    0.911040]  __qdisc_destroy (net/sched/sch_generic.c:1076)\n[    0.911236]  tc_new_tfilter (net/sched/cls_api.c:2447)\n[    0.911447]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)\n[    0.911663]  ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6861)\n[    0.911894]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)\n[    0.912100]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)\n[    0.912296]  ? __alloc_skb (net/core/skbuff.c:706)\n[    0.912484]  netlink_sendmsg (net/netlink/af\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-21T06:57:23.939Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6116a83ec167d3ab1390cded854d237481f41b63"
        },
        {
          "url": "https://git.kernel.org/stable/c/0809c4bc06c9c961222df29f2eccfd449304056f"
        },
        {
          "url": "https://git.kernel.org/stable/c/cdb24200b043438a144df501f1ebbd926bb1a2c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/11bf9134613f6c71fc0ff36c5d8d33856f6ae3bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/43497313d0da3e12b5cfcd97aa17bf48ee663f95"
        },
        {
          "url": "https://git.kernel.org/stable/c/51ffd447bc37bf1a5776b85523f51d2bc69977f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1d73b1480235731e35c81df70b08f4714a7d095"
        }
      ],
      "title": "net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-22976",
    "datePublished": "2026-01-21T06:57:23.939Z",
    "dateReserved": "2026-01-13T15:37:45.935Z",
    "dateUpdated": "2026-01-21T06:57:23.939Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-22976\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-21T07:16:01.433\",\"lastModified\":\"2026-01-21T07:16:01.433\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset\\n\\n`qfq_class-\u003eleaf_qdisc-\u003eq.qlen \u003e 0` does not imply that the class\\nitself is active.\\n\\nTwo qfq_class objects may point to the same leaf_qdisc. This happens\\nwhen:\\n\\n1. one QFQ qdisc is attached to the dev as the root qdisc, and\\n\\n2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get()\\n/ qdisc_put()) and is pending to be destroyed, as in function\\ntc_new_tfilter.\\n\\nWhen packets are enqueued through the root QFQ qdisc, the shared\\nleaf_qdisc-\u003eq.qlen increases. At the same time, the second QFQ\\nqdisc triggers qdisc_put and qdisc_destroy: the qdisc enters\\nqfq_reset() with its own q-\u003eq.qlen == 0, but its class\u0027s leaf\\nqdisc-\u003eq.qlen \u003e 0. Therefore, the qfq_reset would wrongly deactivate\\nan inactive aggregate and trigger a null-deref in qfq_deactivate_agg:\\n\\n[    0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000\\n[    0.903571] #PF: supervisor write access in kernel mode\\n[    0.903860] #PF: error_code(0x0002) - not-present page\\n[    0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0\\n[    0.904502] Oops: Oops: 0002 [#1] SMP NOPTI\\n[    0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE\\n[    0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\\n[    0.905754] RIP: 0010:qfq_deactivate_agg (include/linux/list.h:992 (discriminator 2) include/linux/list.h:1006 (discriminator 2) net/sched/sch_qfq.c:1367 (discriminator 2) net/sched/sch_qfq.c:1393 (discriminator 2))\\n[    0.906046] Code: 0f 84 4d 01 00 00 48 89 70 18 8b 4b 10 48 c7 c2 ff ff ff ff 48 8b 78 08 48 d3 e2 48 21 f2 48 2b 13 48 8b 30 48 d3 ea 8b 4b 18 0\\n\\nCode starting with the faulting instruction\\n===========================================\\n   0:\\t0f 84 4d 01 00 00    \\tje     0x153\\n   6:\\t48 89 70 18          \\tmov    %rsi,0x18(%rax)\\n   a:\\t8b 4b 10             \\tmov    0x10(%rbx),%ecx\\n   d:\\t48 c7 c2 ff ff ff ff \\tmov    $0xffffffffffffffff,%rdx\\n  14:\\t48 8b 78 08          \\tmov    0x8(%rax),%rdi\\n  18:\\t48 d3 e2             \\tshl    %cl,%rdx\\n  1b:\\t48 21 f2             \\tand    %rsi,%rdx\\n  1e:\\t48 2b 13             \\tsub    (%rbx),%rdx\\n  21:\\t48 8b 30             \\tmov    (%rax),%rsi\\n  24:\\t48 d3 ea             \\tshr    %cl,%rdx\\n  27:\\t8b 4b 18             \\tmov    0x18(%rbx),%ecx\\n\\t...\\n[    0.907095] RSP: 0018:ffffc900004a39a0 EFLAGS: 00010246\\n[    0.907368] RAX: ffff8881043a0880 RBX: ffff888102953340 RCX: 0000000000000000\\n[    0.907723] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\\n[    0.908100] RBP: ffff888102952180 R08: 0000000000000000 R09: 0000000000000000\\n[    0.908451] R10: ffff8881043a0000 R11: 0000000000000000 R12: ffff888102952000\\n[    0.908804] R13: ffff888102952180 R14: ffff8881043a0ad8 R15: ffff8881043a0880\\n[    0.909179] FS:  000000002a1a0380(0000) GS:ffff888196d8d000(0000) knlGS:0000000000000000\\n[    0.909572] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[    0.909857] CR2: 0000000000000000 CR3: 0000000102993002 CR4: 0000000000772ef0\\n[    0.910247] PKRU: 55555554\\n[    0.910391] Call Trace:\\n[    0.910527]  \u003cTASK\u003e\\n[    0.910638]  qfq_reset_qdisc (net/sched/sch_qfq.c:357 net/sched/sch_qfq.c:1485)\\n[    0.910826]  qdisc_reset (include/linux/skbuff.h:2195 include/linux/skbuff.h:2501 include/linux/skbuff.h:3424 include/linux/skbuff.h:3430 net/sched/sch_generic.c:1036)\\n[    0.911040]  __qdisc_destroy (net/sched/sch_generic.c:1076)\\n[    0.911236]  tc_new_tfilter (net/sched/cls_api.c:2447)\\n[    0.911447]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)\\n[    0.911663]  ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6861)\\n[    0.911894]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)\\n[    0.912100]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)\\n[    0.912296]  ? __alloc_skb (net/core/skbuff.c:706)\\n[    0.912484]  netlink_sendmsg (net/netlink/af\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0809c4bc06c9c961222df29f2eccfd449304056f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/11bf9134613f6c71fc0ff36c5d8d33856f6ae3bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43497313d0da3e12b5cfcd97aa17bf48ee663f95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51ffd447bc37bf1a5776b85523f51d2bc69977f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6116a83ec167d3ab1390cded854d237481f41b63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c1d73b1480235731e35c81df70b08f4714a7d095\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdb24200b043438a144df501f1ebbd926bb1a2c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Sightings

Author Source Type Date

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.


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