{
  "cveId": "CVE-2026-99131",
  "url": "https://patchblox.com/security/cve/CVE-2026-99131",
  "summary": "CVE-2026-99131 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99131, released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "xfs: fix capability check in xfs",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  xfs: fix capability check in xfs  An user reported a bug where he managed to evade group\u0027s quota by changing a file\u0027s gid to a different group id the same user belonged to, even though quotas were enforced on both gids and the file\u0027s size was big enough to exceed the quota\u0027s hardlimit.  Commit eba0549bc7d1 replaced a capable() call by a has_capability_noaudit() to prevent unnecessary selinux audit messages. Turns out that both calls have slightly different semantics even though their documentation seems similar. Where in a nutshell:  capable() - Tests the task\u0027s effective credentials has_ns_capability_noaudit() - Tests the task\u0027s real credentials  This most of the time has no practical difference but in some cases like changing attrs (specifically group id in this case) through a NFS client this will allow the quota code to use XFS_QMOPT_FORCE_RES, effectively bypassing quota accounting checks.  Using instead ns_capable_noaudit() should fix this issue and prevent selinux audit messages.  This also fix the remaining calls to has_capability_noaudit()",
  "published": "2026-10-28T11:17:32Z",
  "severity": "Moderate",
  "cvss": 8.2,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
  "epss": 0.0045,
  "epssPercentile": 0.3934,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99131",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-99131",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99131",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.13-1",
      "fix": "DEBIAN-CVE-2026-99131",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99131",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}