{
  "cveId": "CVE-2026-89695",
  "url": "https://patchblox.com/security/cve/CVE-2026-89695",
  "summary": "CVE-2026-89695 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89695 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nfsd: cap decoded POSIX ACL count to bound sort...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nfsd: cap decoded POSIX ACL count to bound sort cost  nfsd4_decode_posixacl() reads a u32 entry count off the wire and passes it straight to posix_acl_alloc() and sort_pacl_range(). The latter is an O(n^2) bubble sort, so a client-chosen count drives unbounded CPU in the server\u0027s compound processing path.      nfsd4_decode_posixacl()       xdr_stream_decode_u32(\u0026count)       /* uncapped u32 */       posix_acl_alloc(count, GFP_KERNEL)       sort_pacl_range(*acl, 0, count - 1) /* O(n^2) bubble sort */  The encoder side in the same file already rejects ACLs whose a_count exceeds NFS_ACL_MAX_ENTRIES, but the decoder introduced in commit 5fc51dfc2eb1 (\u0022NFSD: Add support for XDR decoding POSIX draft ACLs\u0022) omitted the symmetric check.  Fix by rejecting a wire count greater than NFS_ACL_MAX_ENTRIES with nfserr_inval, before any allocation, so the sort is bounded by NFS_ACL_MAX_ENTRIES^2 comparisons.  While we\u0027re in here, also fix the nfserr_resource return if posix_acl_alloc() fails. That\u0027s not a legal error code for v4.1\u002B. Change it to return nfserr_jukebox as that\u0027s more appropriate for memory allocation failures.",
  "published": "2026-09-11T20:19:56Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00488,
  "epssPercentile": 0.42256,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89695",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89695",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}