{"id":"CVE-2026-89831","state":"PUBLISHED","title":"f2fs: protect critical_task_priority updates with s_umount","description":"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.","publishedAt":"2026-09-16T10:31:03.702Z","updatedAt":"2026-10-19T08:53:24.792Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"52190933c37a96164b271f3f30c16099d9eb8c09","status":"affected","lessThan":"bee6dfcc111b1dffdb3e13d73b7028b699fa0165","versionType":"git"},{"version":"52190933c37a96164b271f3f30c16099d9eb8c09","status":"affected","lessThan":"8e4692c6c165e81b2cbb847d8da4b45a53483b33","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/sysfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/sysfs.c"]}],"references":["https://git.kernel.org/stable/c/bee6dfcc111b1dffdb3e13d73b7028b699fa0165","https://git.kernel.org/stable/c/8e4692c6c165e81b2cbb847d8da4b45a53483b33"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89831.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89831","state":"PUBLISHED","datePublished":"2026-09-16T10:31:03.702Z","dateUpdated":"2026-10-19T08:53:24.792Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.769Z"},"containers":{"cna":{"title":"f2fs: protect critical_task_priority updates with s_umount","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"52190933c37a96164b271f3f30c16099d9eb8c09","status":"affected","lessThan":"bee6dfcc111b1dffdb3e13d73b7028b699fa0165","versionType":"git"},{"version":"52190933c37a96164b271f3f30c16099d9eb8c09","status":"affected","lessThan":"8e4692c6c165e81b2cbb847d8da4b45a53483b33","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/sysfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/sysfs.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bee6dfcc111b1dffdb3e13d73b7028b699fa0165"},{"url":"https://git.kernel.org/stable/c/8e4692c6c165e81b2cbb847d8da4b45a53483b33"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:53:24.792Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}