GHSA-6X4X-6P4P-6F5F

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:

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types

Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases

  • protected by region lock
  • in a set destroy phase
  • in a new/temporary set creation phase
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-2026-72436"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:17Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: Don\u0027t use test_bit() in lockless RCU readers in hash types\n\nSashiko pointed out that there are a few lockless RCU readers\nusing test_bit() which is a relaxed atomic operation and\nprovides no memory barrier guarantees. Use test_bit_acquire()\ninstead where the operation may run parallel with add/del/gc,\ni.e. is not one from the next cases\n\n- protected by region lock\n- in a set destroy phase\n- in a new/temporary set creation phase",
  "id": "GHSA-6x4x-6p4p-6f5f",
  "modified": "2026-08-17T06:33:29Z",
  "published": "2026-08-15T06:32:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72436"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e"
    }
  ],
  "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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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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