Vulnerability-Lookup

GHSA-5445-W6X8-6HFQ

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32

Details

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.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74490"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:53Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: avoid use-after-free in poll trace queue dumps\n\nTIPC socket tracepoints dump queue state through tipc_sk_dump(). Most\nqueue-dump callsites already serialize that walk under the socket lock or\nsk-\u003esk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(...,\nTIPC_DUMP_ALL, ...) without holding either lock.\n\nThat lets the poll trace path reach tipc_list_dump() and backlog head/tail\ndumping while another context dequeues and frees an skb, leaving the trace\nhelper dereferencing a stale queue entry.\n\nStop the unlocked poll trace site from requesting queue dumps. Other queue\ndump trace callsites keep their existing output under the locking they\nalready provide, while poll still emits the event itself without walking\nlive queue members from an unlocked context.",
  "id": "GHSA-5445-w6x8-6hfq",
  "modified": "2026-08-19T18:32:28Z",
  "published": "2026-08-15T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74490"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78706367fe1b98aee0a6de27c62b7f1e3035f38d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac2f787980fdf4364cd5651a4c8128e59b8de3aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae7fc824970888b4fdaa076819c9a6f2fcede275"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4f1719dfea023220e0e6bd892b087d76b2a6a49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bed792737b5f1ba773054dbe984502958bdfe6ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d7940bb6a8e7ab28f972c2875cb05783216312dc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74490 (GCVE-0-2026-74490)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37

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.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/3cd57c6b210d50fd1…
https://git.kernel.org/stable/c/ae7fc824970888b4f…
https://git.kernel.org/stable/c/78706367fe1b98aee…
https://git.kernel.org/stable/c/d7940bb6a8e7ab28f…
https://git.kernel.org/stable/c/5e82beba4bc1f91d0…
https://git.kernel.org/stable/c/bed792737b5f1ba77…
https://git.kernel.org/stable/c/ac2f787980fdf4364…
https://git.kernel.org/stable/c/b4f1719dfea023220…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b4b9771bcbbd5839b0f77aba55e2f85989ed6779 , < 3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8 (git) Affected: b4b9771bcbbd5839b0f77aba55e2f85989ed6779 , < ae7fc824970888b4fdaa076819c9a6f2fcede275 (git) Affected: b4b9771bcbbd5839b0f77aba55e2f85989ed6779 , < 78706367fe1b98aee0a6de27c62b7f1e3035f38d (git) Affected: b4b9771bcbbd5839b0f77aba55e2f85989ed6779 , < d7940bb6a8e7ab28f972c2875cb05783216312dc (git) Affected: b4b9771bcbbd5839b0f77aba55e2f85989ed6779 , < 5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d (git) Affected: b4b9771bcbbd5839b0f77aba55e2f85989ed6779 , < bed792737b5f1ba773054dbe984502958bdfe6ce (git) Affected: b4b9771bcbbd5839b0f77aba55e2f85989ed6779 , < ac2f787980fdf4364cd5651a4c8128e59b8de3aa (git) Affected: b4b9771bcbbd5839b0f77aba55e2f85989ed6779 , < b4f1719dfea023220e0e6bd892b087d76b2a6a49 (git)
Linux	Linux	Affected: 5.0 Unaffected: 0 , < 5.0 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8",
              "status": "affected",
              "version": "b4b9771bcbbd5839b0f77aba55e2f85989ed6779",
              "versionType": "git"
            },
            {
              "lessThan": "ae7fc824970888b4fdaa076819c9a6f2fcede275",
              "status": "affected",
              "version": "b4b9771bcbbd5839b0f77aba55e2f85989ed6779",
              "versionType": "git"
            },
            {
              "lessThan": "78706367fe1b98aee0a6de27c62b7f1e3035f38d",
              "status": "affected",
              "version": "b4b9771bcbbd5839b0f77aba55e2f85989ed6779",
              "versionType": "git"
            },
            {
              "lessThan": "d7940bb6a8e7ab28f972c2875cb05783216312dc",
              "status": "affected",
              "version": "b4b9771bcbbd5839b0f77aba55e2f85989ed6779",
              "versionType": "git"
            },
            {
              "lessThan": "5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d",
              "status": "affected",
              "version": "b4b9771bcbbd5839b0f77aba55e2f85989ed6779",
              "versionType": "git"
            },
            {
              "lessThan": "bed792737b5f1ba773054dbe984502958bdfe6ce",
              "status": "affected",
              "version": "b4b9771bcbbd5839b0f77aba55e2f85989ed6779",
              "versionType": "git"
            },
            {
              "lessThan": "ac2f787980fdf4364cd5651a4c8128e59b8de3aa",
              "status": "affected",
              "version": "b4b9771bcbbd5839b0f77aba55e2f85989ed6779",
              "versionType": "git"
            },
            {
              "lessThan": "b4f1719dfea023220e0e6bd892b087d76b2a6a49",
              "status": "affected",
              "version": "b4b9771bcbbd5839b0f77aba55e2f85989ed6779",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: avoid use-after-free in poll trace queue dumps\n\nTIPC socket tracepoints dump queue state through tipc_sk_dump(). Most\nqueue-dump callsites already serialize that walk under the socket lock or\nsk-\u003esk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(...,\nTIPC_DUMP_ALL, ...) without holding either lock.\n\nThat lets the poll trace path reach tipc_list_dump() and backlog head/tail\ndumping while another context dequeues and frees an skb, leaving the trace\nhelper dereferencing a stale queue entry.\n\nStop the unlocked poll trace site from requesting queue dumps. Other queue\ndump trace callsites keep their existing output under the locking they\nalready provide, while poll still emits the event itself without walking\nlive queue members from an unlocked context."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The UAF is a race between tipc_poll()\u0027s unlocked trace queue walk and concurrent skb dequeue/free on the TIPC receive path; on cluster nodes a remote TIPC peer can supply the freeing side while poll/epoll runs on the victim socket processing that network traffic.\nAC:L - The attacker controls both sides of the race by concurrently polling/epolling a TIPC socket while sending/receiving TIPC traffic (or having a remote peer deliver packets), and can repeat attempts until the unlocked head/tail dump overlaps skb free.\nPR:L - Exploitation requires only an unprivileged local process with an AF_TIPC socket calling poll/epoll while TIPC traffic is processed; no real-root capability is needed beyond participation in an operational TIPC cluster where tracing may be enabled for diagnostics.\nUI:N - No end-user interaction is required; the race is triggered by normal daemon poll/epoll loops and incoming TIPC packet processing on cluster nodes.\nS:U - Impact is confined to kernel memory corruption and privilege boundaries within the host kernel; this is not a cross-VM or cross-container sandbox escape scenario.\nC:H - The bug is a use-after-free where tipc_list_dump()/tipc_skb_dump() dereference head/tail skbs after concurrent dequeue/kfree, enabling reads of freed skb and message memory usable for kernel information disclosure.\nI:H - UAF on skb queue entries can be leveraged with heap grooming for arbitrary kernel writes and control-flow hijack, not merely a benign crash, because freed skbs can be reallocated under attacker-influenced TIPC traffic.\nA:H - Accessing freed skbs from the poll trace path can cause kernel oops/panic or hang during tipc_skb_dump(), and repeated triggering yields reliable denial of service on affected cluster nodes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:37:45.610Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae7fc824970888b4fdaa076819c9a6f2fcede275"
        },
        {
          "url": "https://git.kernel.org/stable/c/78706367fe1b98aee0a6de27c62b7f1e3035f38d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7940bb6a8e7ab28f972c2875cb05783216312dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/bed792737b5f1ba773054dbe984502958bdfe6ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac2f787980fdf4364cd5651a4c8128e59b8de3aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4f1719dfea023220e0e6bd892b087d76b2a6a49"
        }
      ],
      "title": "tipc: avoid use-after-free in poll trace queue dumps",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74490",
    "datePublished": "2026-08-15T12:27:20.107Z",
    "dateReserved": "2026-08-15T05:44:03.905Z",
    "dateUpdated": "2026-08-19T16:37:45.610Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-5445-W6X8-6HFQ

CVE-2026-74490 (GCVE-0-2026-74490)

Tags

Sightings

Nomenclature