{
  "cveId": "CVE-2026-89835",
  "url": "https://patchblox.com/security/cve/CVE-2026-89835",
  "summary": "CVE-2026-89835 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89835, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: avoid NULL checkpoint thread access in sys...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: avoid NULL checkpoint thread access in sysfs  checkpoint_merge can be enabled even when no checkpoint merge thread is running. A read-only mount is one case: f2fs does not start f2fs_issue_ckpt there, but ckpt_thread_ioprio is still writable through sysfs.  The ckpt_thread_ioprio store path updates the saved ioprio value and, when checkpoint_merge is enabled, calls set_task_ioprio() for the checkpoint thread. If cprc-\u003Ef2fs_issue_ckpt is NULL, that dereferences a NULL task pointer.  Protect ckpt_thread_ioprio sysfs writes with s_umount as well, so the checkpoint thread cannot disappear under the store path while updating its ioprio.",
  "published": "2026-09-16T11:16:50Z",
  "severity": "",
  "epss": 0.00215,
  "epssPercentile": 0.11903,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-89835",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89835",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89835",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89835",
      "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-2026-89835",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89835",
      "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"
  }
}