GHSA-PW2H-MP67-XJW4

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33
VLAI
Details

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

xfrm: Fix xfrm state cache insertion race

The xfrm input state cache insertion code checks the validity of the state before acquiring the global xfrm_state_lock. Thus it's possible for someone else to kill the state after it passed the validity check, and then the insertion will add the dead state to the cache.

Fix this by moving the validity check inside the lock.

This entire function is called on the input path, where BH must be off (e.g., the caller of this function xfrm_input acquires its spinlocks without disabling BH).

So there is no need to disable BH here or take the RCU read lock. Remove both and replace them with an assertion that trips if BH is accidentally enabled on some future calling path.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72451"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:19Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix xfrm state cache insertion race\n\nThe xfrm input state cache insertion code checks the validity of\nthe state before acquiring the global xfrm_state_lock.  Thus it\u0027s\npossible for someone else to kill the state after it passed the\nvalidity check, and then the insertion will add the dead state\nto the cache.\n\nFix this by moving the validity check inside the lock.\n\nThis entire function is called on the input path, where BH must\nbe off (e.g., the caller of this function xfrm_input acquires\nits spinlocks without disabling BH).\n\nSo there is no need to disable BH here or take the RCU read lock.\nRemove both and replace them with an assertion that trips if BH\nis accidentally enabled on some future calling path.",
  "id": "GHSA-pw2h-mp67-xjw4",
  "modified": "2026-08-17T06:33:30Z",
  "published": "2026-08-15T06:32:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72451"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/041859fd55c81ea55e76d051e39b7b79975b8c7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6dab4dec9a49121d079981ac913569f232c06b06"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1a3360a0c44b8b5c134db2a9d0667b61c9cf523"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ddd3d0132920319ac426e12456013eadbae67e15"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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