Vulnerability-Lookup

CVE-2026-64518 (GCVE-0-2026-64518)

Vulnerability from cvelistv5 – Published: 2026-07-25 09:14 – Updated: 2026-07-25 09:14

Title

tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().

Summary

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key(). lockdep_sock_is_held() was added in tcp_ao_established_key() by the cited commit. It can be called from tcp_v[46]_timewait_ack() with twsk. Since it does not have sk->sk_lock, the lockdep annotation results in out-of-bound access. $ pahole -C tcp_timewait_sock vmlinux | grep size /* size: 288, cachelines: 5, members: 8 */ $ pahole -C sock vmlinux | grep sk_lock socket_lock_t sk_lock; /* 440 192 */ Let's not use lockdep_sock_is_held() for TCP_TIME_WAIT.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/87bb3e719042f0030…
https://git.kernel.org/stable/c/510db031ba6eb4013…
https://git.kernel.org/stable/c/29cf64d128c94cf98…
https://git.kernel.org/stable/c/03cb001ef87b3f8d8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 051f49d5176613dea88ecf73a101c3a99f4720e9 , < 87bb3e719042f0030a6dad39118c6a6b2a491ad9 (git) Affected: 6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 , < 510db031ba6eb40134f84c90ef963ea4b6dfb878 (git) Affected: 6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 , < 29cf64d128c94cf98d1c69d8b2962d39db5ff4c6 (git) Affected: 6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 , < 03cb001ef87b3f8d859cf7f96329acf3d6235d29 (git) Affected: 6.12.5 , < 6.12.92 (semver)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
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          "programFiles": [
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              "versionType": "git"
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            {
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              "version": "6.13"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().\n\nlockdep_sock_is_held() was added in tcp_ao_established_key()\nby the cited commit.\n\nIt can be called from tcp_v[46]_timewait_ack() with twsk.\n\nSince it does not have sk-\u003esk_lock, the lockdep annotation\nresults in out-of-bound access.\n\n  $ pahole -C tcp_timewait_sock vmlinux | grep size\n  \t/* size: 288, cachelines: 5, members: 8 */\n  $ pahole -C sock vmlinux | grep sk_lock\n  \tsocket_lock_t              sk_lock;              /*   440   192 */\n\nLet\u0027s not use lockdep_sock_is_held() for TCP_TIME_WAIT."
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      "providerMetadata": {
        "dateUpdated": "2026-07-25T09:14:44.603Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/510db031ba6eb40134f84c90ef963ea4b6dfb878"
        },
        {
          "url": "https://git.kernel.org/stable/c/29cf64d128c94cf98d1c69d8b2962d39db5ff4c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/03cb001ef87b3f8d859cf7f96329acf3d6235d29"
        }
      ],
      "title": "tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64518",
    "datePublished": "2026-07-25T09:14:44.603Z",
    "dateReserved": "2026-07-19T15:36:31.794Z",
    "dateUpdated": "2026-07-25T09:14:44.603Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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  }
}

GHSA-MFG2-PH7G-PF6H

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().

lockdep_sock_is_held() was added in tcp_ao_established_key() by the cited commit.

It can be called from tcp_v[46]_timewait_ack() with twsk.

Since it does not have sk->sk_lock, the lockdep annotation results in out-of-bound access.

$ pahole -C tcp_timewait_sock vmlinux | grep size / size: 288, cachelines: 5, members: 8 / $ pahole -C sock vmlinux | grep sk_lock socket_lock_t sk_lock; / 440 192 /

Let's not use lockdep_sock_is_held() for TCP_TIME_WAIT.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64518"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().\n\nlockdep_sock_is_held() was added in tcp_ao_established_key()\nby the cited commit.\n\nIt can be called from tcp_v[46]_timewait_ack() with twsk.\n\nSince it does not have sk-\u003esk_lock, the lockdep annotation\nresults in out-of-bound access.\n\n  $ pahole -C tcp_timewait_sock vmlinux | grep size\n  \t/* size: 288, cachelines: 5, members: 8 */\n  $ pahole -C sock vmlinux | grep sk_lock\n  \tsocket_lock_t              sk_lock;              /*   440   192 */\n\nLet\u0027s not use lockdep_sock_is_held() for TCP_TIME_WAIT.",
  "id": "GHSA-mfg2-ph7g-pf6h",
  "modified": "2026-07-25T12:31:39Z",
  "published": "2026-07-25T12:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64518"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03cb001ef87b3f8d859cf7f96329acf3d6235d29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29cf64d128c94cf98d1c69d8b2962d39db5ff4c6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/510db031ba6eb40134f84c90ef963ea4b6dfb878"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87bb3e719042f0030a6dad39118c6a6b2a491ad9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-64518 (GCVE-0-2026-64518)

GHSA-MFG2-PH7G-PF6H

Tags

Sightings

Nomenclature