FKIE_CVE-2026-64518

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-11-03 18:15
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03cb001ef87b3f8d859cf7f96329acf3d6235d29
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29cf64d128c94cf98d1c69d8b2962d39db5ff4c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/510db031ba6eb40134f84c90ef963ea4b6dfb878
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/87bb3e719042f0030a6dad39118c6a6b2a491ad9
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_ao.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "87bb3e719042f0030a6dad39118c6a6b2a491ad9",
              "status": "affected",
              "version": "051f49d5176613dea88ecf73a101c3a99f4720e9",
              "versionType": "git"
            },
            {
              "lessThan": "510db031ba6eb40134f84c90ef963ea4b6dfb878",
              "status": "affected",
              "version": "6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6",
              "versionType": "git"
            },
            {
              "lessThan": "29cf64d128c94cf98d1c69d8b2962d39db5ff4c6",
              "status": "affected",
              "version": "6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6",
              "versionType": "git"
            },
            {
              "lessThan": "03cb001ef87b3f8d859cf7f96329acf3d6235d29",
              "status": "affected",
              "version": "6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.92",
              "status": "affected",
              "version": "6.12.5",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_ao.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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",
      "url": "https://git.kernel.org/stable/c/03cb001ef87b3f8d859cf7f96329acf3d6235d29"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/29cf64d128c94cf98d1c69d8b2962d39db5ff4c6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/510db031ba6eb40134f84c90ef963ea4b6dfb878"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/87bb3e719042f0030a6dad39118c6a6b2a491ad9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}



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