GHSA-G967-C7QH-8Q49

Vulnerability from github – Published: 2026-04-22 15:31 – Updated: 2026-04-27 15:30
VLAI?
Details

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

xfrm: prevent policy_hthresh.work from racing with netns teardown

A XFRM_MSG_NEWSPDINFO request can queue the per-net work item policy_hthresh.work onto the system workqueue.

The queued callback, xfrm_hash_rebuild(), retrieves the enclosing struct net via container_of(). If the net namespace is torn down before that work runs, the associated struct net may already have been freed, and xfrm_hash_rebuild() may then dereference stale memory.

xfrm_policy_fini() already flushes policy_hash_work during teardown, but it does not synchronize policy_hthresh.work.

Synchronize policy_hthresh.work in xfrm_policy_fini() as well, so the queued work cannot outlive the net namespace teardown and access a freed struct net.

Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-31516"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-22T14:16:51Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: prevent policy_hthresh.work from racing with netns teardown\n\nA XFRM_MSG_NEWSPDINFO request can queue the per-net work item\npolicy_hthresh.work onto the system workqueue.\n\nThe queued callback, xfrm_hash_rebuild(), retrieves the enclosing\nstruct net via container_of(). If the net namespace is torn down\nbefore that work runs, the associated struct net may already have\nbeen freed, and xfrm_hash_rebuild() may then dereference stale memory.\n\nxfrm_policy_fini() already flushes policy_hash_work during teardown,\nbut it does not synchronize policy_hthresh.work.\n\nSynchronize policy_hthresh.work in xfrm_policy_fini() as well, so the\nqueued work cannot outlive the net namespace teardown and access a\nfreed struct net.",
  "id": "GHSA-g967-c7qh-8q49",
  "modified": "2026-04-27T15:30:39Z",
  "published": "2026-04-22T15:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31516"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29fe3a61bcdce398ee3955101c39f89c01a8a77e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e2e77843fef473ef47e322d52436d8308582a96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56ea2257b83ee29a543f158159e3d1abc1e3e4fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8854e9367465d784046362698731c1111e3b39b8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/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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