CVE-2026-64518 (GCVE-0-2026-64518)
Vulnerability from cvelistv5
Published
2026-07-25 09:14
Modified
2026-07-25 09:14
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 051f49d5176613dea88ecf73a101c3a99f4720e9
Version: 6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6
Version: 6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6
Version: 6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6
Version: 6.12.5   ≤
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
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      "cpeApplicability": [
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T09:14:44.603Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/87bb3e719042f0030a6dad39118c6a6b2a491ad9"
        },
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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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  "cveMetadata": {
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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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