{"id":"CVE-2026-89831","summary":"f2fs: protect critical_task_priority updates with s_umount","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.","modified":"2026-09-18T03:48:33.262644913Z","published":"2026-09-16T10:31:03.702Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89831.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"52190933c37a96164b271f3f30c16099d9eb8c09"},{"fixed":"bee6dfcc111b1dffdb3e13d73b7028b699fa0165"},{"fixed":"8e4692c6c165e81b2cbb847d8da4b45a53483b33"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89831.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0"},{"fixed":"7.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89831.json"}}],"schema_version":"1.9.0"}