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HighFix available

tipc: avoid use-after-free in poll trace queue dumps

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free in poll trace queue dumps TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most queue-dump callsites already serialize that walk under the socket lock or sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(..., TIPC_DUMP_ALL, ...) without holding either lock. That lets the poll trace path reach tipc_list_dump() and backlog head/tail dumping while another context dequeues and frees an skb, leaving the trace helper dereferencing a stale queue entry. Stop the unlocked poll trace site from requesting queue dumps. Other queue dump trace callsites keep their existing output under the locking they already provide, while poll still emits the event itself without walking live queue members from an unlocked context.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.265, 5.15.216, 6.1.183, 6.12.103, 6.18.44, 6.6.151, 7.1.8
CVEs
CVE-2026-74490
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 17:45 UTC · Revision 1

Source evidence

tipc: avoid use-after-free in poll trace queue dumps

core-osv · Original source

Published 15 Aug 2026, 12:27 UTC

In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free in poll trace queue dumps TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most queue-dump callsites already serialize that walk under the socket lock or sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(..., TIPC_DUMP_ALL, ...) without holding either lock. That lets the poll trace path reach tipc_list_dump() and backlog head/tail dumping while another context dequeues and frees an skb, leaving the trace helper dereferencing a stale queue entry. Stop the unlocked poll trace site from requesting queue dumps. Other queue dump trace callsites keep their existing output under the locking they already provide, while poll still emits the event itself without walking live queue members from an unlocked context.

osv:CVE-2026-74490

Kernel

Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8

Complete source record
{
  "id": "763d315acb913eee12fc0892114aa7127c8d375a7bb5728bd91dcd89daddfb21",
  "url": "https://osv.dev/vulnerability/CVE-2026-74490",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tipc: avoid use-after-free in poll trace queue dumps",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free in poll trace queue dumps TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most queue-dump callsites already serialize that walk under the socket lock or sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(..., TIPC_DUMP_ALL, ...) without holding either lock. That lets the poll trace path reach tipc_list_dump() and backlog head/tail dumping while another context dequeues and frees an skb, leaving the trace helper dereferencing a stale queue entry. Stop the unlocked poll trace site from requesting queue dumps. Other queue dump trace callsites keep their existing output under the locking they already provide, while poll still emits the event itself without walking live queue members from an unlocked context.",
    "evidence": "osv:CVE-2026-74490",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.265",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.15.216",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.183",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.151",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.103",
            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-74490",
      "aliases": [
        "CVE-2026-74490"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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                },
                {
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                  "fixed": "78706367fe1b98aee0a6de27c62b7f1e3035f38d"
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                {
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
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                {
                  "fixed": "5.15.216"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.16.0"
                },
                {
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              ]
            },
            {
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              ]
            },
            {
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                {
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            },
            {
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                  "introduced": "6.19.0"
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          "package": {
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            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:38.111039056Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8",
        "https://git.kernel.org/stable/c/5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d",
        "https://git.kernel.org/stable/c/78706367fe1b98aee0a6de27c62b7f1e3035f38d",
        "https://git.kernel.org/stable/c/ac2f787980fdf4364cd5651a4c8128e59b8de3aa",
        "https://git.kernel.org/stable/c/ae7fc824970888b4fdaa076819c9a6f2fcede275",
        "https://git.kernel.org/stable/c/b4f1719dfea023220e0e6bd892b087d76b2a6a49",
        "https://git.kernel.org/stable/c/bed792737b5f1ba773054dbe984502958bdfe6ce",
        "https://git.kernel.org/stable/c/d7940bb6a8e7ab28f972c2875cb05783216312dc",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74490.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74490",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74490.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74490",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505452,
  "published_at": "2026-08-15T12:27:20.107+00:00"
}