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

Vulnerability from cvelistv5 – Published: 2026-07-25 09:14 – Updated: 2026-07-25 09:14
VLAI
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 CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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{
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          "product": "Linux",
          "programFiles": [
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      "cpeApplicability": [
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          "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."
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/03cb001ef87b3f8d859cf7f96329acf3d6235d29"
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      ],
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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",
  "vulnerability-lookup:meta": {
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      "date": "2026-11-08",
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      "percentile": "0.06132"
    },
    "nvd": {
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "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."
          }
        ],
        "id": "CVE-2026-64518",
        "lastModified": "2026-11-03T18:15:39.353",
        "metrics": {},
        "published": "2026-07-25T10:17:38.080",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "cve": "CVE-2026-64518",
      "id": "CVE-2026-64518",
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      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64518.json",
      "version": "3"
    }
  }
}



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