{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "52190933c37a96164b271f3f30c16099d9eb8c09"
            },
            {
              "fixed": "bee6dfcc111b1dffdb3e13d73b7028b699fa0165"
            },
            {
              "fixed": "8e4692c6c165e81b2cbb847d8da4b45a53483b33"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89831.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: protect critical_task_priority updates with s_umount\n\nThe sysfs store path already takes s_umount for GC thread control\nentries, and ckpt_thread_ioprio is covered as well.\n\ncritical_task_priority also updates checkpoint or GC kthread scheduling\nstate, but it is not covered by that serialization. It can race with\nremount or teardown paths that are stopping those threads.\n\nProtect critical_task_priority sysfs writes with s_umount too.",
  "id": "CVE-2026-89831",
  "modified": "2026-09-18T03:30:27.128788208Z",
  "published": "2026-09-16T10:31:03.702Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e4692c6c165e81b2cbb847d8da4b45a53483b33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bee6dfcc111b1dffdb3e13d73b7028b699fa0165"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89831.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89831"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "f2fs: protect critical_task_priority updates with s_umount"
}