{
  "cveId": "CVE-2026-90277",
  "url": "https://patchblox.com/security/cve/CVE-2026-90277",
  "summary": "CVE-2026-90277 is fixed in linux on 1 platform by DEBIAN-CVE-2026-90277 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "md/md-llbitmap: prevent create failure bitmap UAF",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  md/md-llbitmap: prevent create failure bitmap UAF  llbitmap_create() publishes mddev-\u003Ebitmap before reading the bitmap superblock. This is needed because llbitmap_read_sb() can initialize a new bitmap and flush it through helpers that use mddev-\u003Ebitmap.  If llbitmap_read_sb() fails, the old cleanup dropped bitmap_info.mutex and freed llbitmap before clearing mddev-\u003Ebitmap. Readers such as /proc/mdstat rely on bitmap_info.mutex to keep the bitmap pointer stable while collecting bitmap stats, so they could observe the stale pointer after the failed create path released the mutex.  Clear mddev-\u003Ebitmap while still holding bitmap_info.mutex, then free the failed llbitmap after dropping the mutex. This makes mutex-protected readers see either a live bitmap or no bitmap.",
  "published": "2026-09-17T17:17:24Z",
  "severity": "",
  "epss": 0.00206,
  "epssPercentile": 0.10772,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90277",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90277",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90277",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "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"
  }
}