{
  "cveId": "CVE-2026-89723",
  "url": "https://patchblox.com/security/cve/CVE-2026-89723",
  "summary": "CVE-2026-89723 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89723, 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:  nilfs2: fix slab-out-of-bounds in nilfs_direct_p...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation  Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error in nilfs_direct_propagate() during testing.  Analysis revealed that after truncating a file, a node block immediately below the B-tree root was not deleted.  Instead, it remained in the B-tree node cache in a dirty state.  The log writer subsequently detected this block and incorrectly invoked nilfs_direct_propagate() on it, which is designed to handle only data blocks in direct mapping.  B-tree nodes in the cache are managed by virtual block numbers, and their logical keys typically exceed the range expected by direct mapping. Consequently, processing such a node as a direct mapping entry triggers a slab-out-of-bounds access.  The root cause is that when a B-tree mapping collapses into a direct mapping during truncation, an intermediate node block pointed to by the root node is left behind as garbage instead of being explicitly deleted.  This resolves the issue by adding a nilfs_btree_discard() operation to delete the remaining intermediate node block during the conversion. A \u0027deform\u0027 flag is added to the bop_delete interface to explicitly signal that the deletion is part of a mapping transformation.  This allows the B-tree mapping implementation to perform the necessary cleanup and discarding of the residual node structure that would be otherwise be left orphaned after the transition.",
  "published": "2026-09-11T20:20:01Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00169,
  "epssPercentile": 0.06258,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.190-1",
      "fix": "DEBIAN-CVE-2026-89723",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89723",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-89723",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89723",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89723",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89723",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-89723",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89723",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}