{
  "cveId": "CVE-2026-52906",
  "url": "https://patchblox.com/security/cve/CVE-2026-52906",
  "summary": "CVE-2026-52906 is fixed in linux on 1 platform by DEBIAN-CVE-2026-52906 (version 7.0.4-1), released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  9p: fix access mode flags being ORed instead of...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  9p: fix access mode flags being ORed instead of replaced  Since commit 1f3e4142c0eb (\u00229p: convert to the new mount API\u0022), v9fs_apply_options() applies parsed mount flags with |= onto flags already set by v9fs_session_init(). For 9P2000.L, session_init sets V9FS_ACCESS_CLIENT as the default, so when the user mounts with \u0022access=user\u0022, both bits end up set. Access mode checks compare against exact values, so having both bits set matches neither mode.  This causes v9fs_fid_lookup() to fall through to the default switch case, using INVALID_UID (nobody/65534) instead of current_fsuid() for all fid lookups. Root is then unable to chown or perform other privileged operations.  Fix by clearing the access mask before applying the user\u0027s choice.",
  "published": "2026-06-09T14:16:45Z",
  "severity": "high",
  "cvss": 7.7,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00121,
  "epssPercentile": 0.01891,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.4-1",
      "fix": "DEBIAN-CVE-2026-52906",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-52906",
      "released": "2026-06-24T14:07:24Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}