CVE-2026-23011 (GCVE-0-2026-23011)

Vulnerability from cvelistv5 – Published: 2026-01-25 14:36 – Updated: 2026-01-25 14:36
VLAI?
Title
ipv4: ip_gre: make ipgre_header() robust
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4: ip_gre: make ipgre_header() robust Analog to commit db5b4e39c4e6 ("ip6_gre: make ip6gre_header() robust") Over the years, syzbot found many ways to crash the kernel in ipgre_header() [1]. This involves team or bonding drivers ability to dynamically change their dev->needed_headroom and/or dev->hard_header_len In this particular crash mld_newpack() allocated an skb with a too small reserve/headroom, and by the time mld_sendpack() was called, syzbot managed to attach an ipgre device. [1] skbuff: skb_under_panic: text:ffffffff89ea3cb7 len:2030915468 put:2030915372 head:ffff888058b43000 data:ffff887fdfa6e194 tail:0x120 end:0x6c0 dev:team0 kernel BUG at net/core/skbuff.c:213 ! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 1322 Comm: kworker/1:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: mld mld_ifc_work RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213 Call Trace: <TASK> skb_under_panic net/core/skbuff.c:223 [inline] skb_push+0xc3/0xe0 net/core/skbuff.c:2641 ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:897 dev_hard_header include/linux/netdevice.h:3436 [inline] neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318 mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855 mld_send_cr net/ipv6/mcast.c:2154 [inline] mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c54419321455631079c7d6e60bc732dd0c5914c5 , < aa57bfea4674e6da8104fa3a37760a6f5f255dad (git)
Affected: c54419321455631079c7d6e60bc732dd0c5914c5 , < 554201ed0a8f4d32e719f42caeaeb2735a9ed6ca (git)
Affected: c54419321455631079c7d6e60bc732dd0c5914c5 , < e67c577d89894811ce4dcd1a9ed29d8b63476667 (git)
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    Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc6 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_gre.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aa57bfea4674e6da8104fa3a37760a6f5f255dad",
              "status": "affected",
              "version": "c54419321455631079c7d6e60bc732dd0c5914c5",
              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_gre.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.10"
            },
            {
              "lessThan": "3.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.67",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.67",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "6.18.7",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.19-rc6",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: ip_gre: make ipgre_header() robust\n\nAnalog to commit db5b4e39c4e6 (\"ip6_gre: make ip6gre_header() robust\")\n\nOver the years, syzbot found many ways to crash the kernel\nin ipgre_header() [1].\n\nThis involves team or bonding drivers ability to dynamically\nchange their dev-\u003eneeded_headroom and/or dev-\u003ehard_header_len\n\nIn this particular crash mld_newpack() allocated an skb\nwith a too small reserve/headroom, and by the time mld_sendpack()\nwas called, syzbot managed to attach an ipgre device.\n\n[1]\nskbuff: skb_under_panic: text:ffffffff89ea3cb7 len:2030915468 put:2030915372 head:ffff888058b43000 data:ffff887fdfa6e194 tail:0x120 end:0x6c0 dev:team0\n kernel BUG at net/core/skbuff.c:213 !\nOops: invalid opcode: 0000 [#1] SMP KASAN PTI\nCPU: 1 UID: 0 PID: 1322 Comm: kworker/1:9 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nWorkqueue: mld mld_ifc_work\n RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213\nCall Trace:\n \u003cTASK\u003e\n  skb_under_panic net/core/skbuff.c:223 [inline]\n  skb_push+0xc3/0xe0 net/core/skbuff.c:2641\n  ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:897\n  dev_hard_header include/linux/netdevice.h:3436 [inline]\n  neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618\n  NF_HOOK_COND include/linux/netfilter.h:307 [inline]\n  ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247\n  NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318\n  mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855\n  mld_send_cr net/ipv6/mcast.c:2154 [inline]\n  mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693\n  process_one_work kernel/workqueue.c:3257 [inline]\n  process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-25T14:36:24.455Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aa57bfea4674e6da8104fa3a37760a6f5f255dad"
        },
        {
          "url": "https://git.kernel.org/stable/c/554201ed0a8f4d32e719f42caeaeb2735a9ed6ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/e67c577d89894811ce4dcd1a9ed29d8b63476667"
        }
      ],
      "title": "ipv4: ip_gre: make ipgre_header() robust",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23011",
    "datePublished": "2026-01-25T14:36:24.455Z",
    "dateReserved": "2026-01-13T15:37:45.939Z",
    "dateUpdated": "2026-01-25T14:36:24.455Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23011\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-25T15:15:55.977\",\"lastModified\":\"2026-01-26T15:03:33.357\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv4: ip_gre: make ipgre_header() robust\\n\\nAnalog to commit db5b4e39c4e6 (\\\"ip6_gre: make ip6gre_header() robust\\\")\\n\\nOver the years, syzbot found many ways to crash the kernel\\nin ipgre_header() [1].\\n\\nThis involves team or bonding drivers ability to dynamically\\nchange their dev-\u003eneeded_headroom and/or dev-\u003ehard_header_len\\n\\nIn this particular crash mld_newpack() allocated an skb\\nwith a too small reserve/headroom, and by the time mld_sendpack()\\nwas called, syzbot managed to attach an ipgre device.\\n\\n[1]\\nskbuff: skb_under_panic: text:ffffffff89ea3cb7 len:2030915468 put:2030915372 head:ffff888058b43000 data:ffff887fdfa6e194 tail:0x120 end:0x6c0 dev:team0\\n kernel BUG at net/core/skbuff.c:213 !\\nOops: invalid opcode: 0000 [#1] SMP KASAN PTI\\nCPU: 1 UID: 0 PID: 1322 Comm: kworker/1:9 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\\nWorkqueue: mld mld_ifc_work\\n RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213\\nCall Trace:\\n \u003cTASK\u003e\\n  skb_under_panic net/core/skbuff.c:223 [inline]\\n  skb_push+0xc3/0xe0 net/core/skbuff.c:2641\\n  ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:897\\n  dev_hard_header include/linux/netdevice.h:3436 [inline]\\n  neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618\\n  NF_HOOK_COND include/linux/netfilter.h:307 [inline]\\n  ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247\\n  NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318\\n  mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855\\n  mld_send_cr net/ipv6/mcast.c:2154 [inline]\\n  mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693\\n  process_one_work kernel/workqueue.c:3257 [inline]\\n  process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\\n  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\\n  kthread+0x711/0x8a0 kernel/kthread.c:463\\n  ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/554201ed0a8f4d32e719f42caeaeb2735a9ed6ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa57bfea4674e6da8104fa3a37760a6f5f255dad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e67c577d89894811ce4dcd1a9ed29d8b63476667\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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