{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-38583","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-06-18T19:36:34.928Z","datePublished":"2024-06-19T13:37:39.858Z","dateUpdated":"2026-08-05T11:32:58.962Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:32:58.962Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix use-after-free of timer for log writer thread\n\nPatch series \"nilfs2: fix log writer related issues\".\n\nThis bug fix series covers three nilfs2 log writer-related issues,\nincluding a timer use-after-free issue and potential deadlock issue on\nunmount, and a potential freeze issue in event synchronization found\nduring their analysis.  Details are described in each commit log.\n\n\nThis patch (of 3):\n\nA use-after-free issue has been reported regarding the timer sc_timer on\nthe nilfs_sc_info structure.\n\nThe problem is that even though it is used to wake up a sleeping log\nwriter thread, sc_timer is not shut down until the nilfs_sc_info structure\nis about to be freed, and is used regardless of the thread's lifetime.\n\nFix this issue by limiting the use of sc_timer only while the log writer\nthread is alive."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug lives in the nilfs2 log-writer (segctord) lifecycle and is triggered through local filesystem activity plus teardown of the mount (nilfs_put_super → nilfs_detach_log_writer); there is no remote or network-facing path to fs/nilfs2/segment.c.\nAC:L - The attacker controls both sides of the race — ordinary file writes arm sc_timer via nilfs_transaction_commit() → nilfs_segctor_start_timer() (expires = jiffies + sc_interval, 5s default), and the log-writer thread's exit is driven by the unmount, while the window can be widened arbitrarily by leaving lots of dirty data so nilfs_segctor_write_out() spends seconds in disk I/O (and nilfs_segctor_notify() even re-arms the timer after the thread is dead).\nPR:L - The dangling-timer condition is created by ordinary unprivileged file writes on the mounted nilfs2 volume, and in realistic deployments (desktops/kiosks with udisks2 or autofs managing removable nilfs2 media, appliances where mount lifecycle is user-driven) an unprivileged local user also controls when the volume is unmounted, so no root capability is inherently needed beyond basic access to the mount.\nUI:N - No victim action is needed — the attacker's own file writes and the mount teardown (automounter expiry, media eject, or routine unmount) suffice; nothing must be opened or accepted by another user.\nS:U - The corruption occurs in kernel memory (a freed task_struct) within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - nilfs_construction_timeout() dereferences sci->sc_timer_task, which is never cleared when nilfs_segctor_thread() exits, so wake_up_process() operates on a freed kthread task_struct; this use-after-free lets an attacker who reclaims that memory read and infer kernel state, and per kernel scoring practice a UAF is treated as High confidentiality impact.\nI:H - try_to_wake_up() writes into the freed task_struct (p->__state, p->on_rq, scheduler entity fields) and dereferences p->sched_class function pointers, giving a write primitive and potential control-flow hijack if the slab memory is reallocated with attacker-sprayed content.\nA:H - Even without successful heap grooming, the stale timer firing on freed memory corrupts scheduler state and reliably produces a KASAN splat, oops, or kernel panic, and the fault occurs during unmount so the system is left in an inconsistent state."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/segment.c"],"versions":[{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"822ae5a8eac30478578a75f7e064f0584931bf2d","status":"affected","versionType":"git"},{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"82933c84f188dcfe89eb26b0b48ab5d1ca99d164","status":"affected","versionType":"git"},{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"67fa90d4a2ccd9ebb0e1e168c7d0b5d0cf3c7148","status":"affected","versionType":"git"},{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"e65ccf3a4de4f0c763d94789615b83e11f204438","status":"affected","versionType":"git"},{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"86a30d6302deddb9fb97ba6fc4b04d0e870b582a","status":"affected","versionType":"git"},{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"f9186bba4ea282b07293c1c892441df3a5441cb0","status":"affected","versionType":"git"},{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"2f12b2c03c5dae1a0de0a9e5853177e3d6eee3c6","status":"affected","versionType":"git"},{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"68e738be5c518fc3c4e9146b66f67c8fee0135fb","status":"affected","versionType":"git"},{"version":"fdce895ea5dd4e24edf1f4d693827349a4e5b3b4","lessThan":"f5d4e04634c9cf68bdf23de08ada0bb92e8befe7","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/segment.c"],"versions":[{"version":"2.6.35","status":"affected"},{"version":"0","lessThan":"2.6.35","status":"unaffected","versionType":"semver"},{"version":"4.19.316","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.278","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.219","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.161","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.94","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.33","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.8.12","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9.3","lessThanOrEqual":"6.9.*","status":"unaffected","versionType":"semver"},{"version":"6.10","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"4.19.316"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"5.4.278"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"5.10.219"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"5.15.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.1.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.6.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.8.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.9.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.35","versionEndExcluding":"6.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/822ae5a8eac30478578a75f7e064f0584931bf2d"},{"url":"https://git.kernel.org/stable/c/82933c84f188dcfe89eb26b0b48ab5d1ca99d164"},{"url":"https://git.kernel.org/stable/c/67fa90d4a2ccd9ebb0e1e168c7d0b5d0cf3c7148"},{"url":"https://git.kernel.org/stable/c/e65ccf3a4de4f0c763d94789615b83e11f204438"},{"url":"https://git.kernel.org/stable/c/86a30d6302deddb9fb97ba6fc4b04d0e870b582a"},{"url":"https://git.kernel.org/stable/c/f9186bba4ea282b07293c1c892441df3a5441cb0"},{"url":"https://git.kernel.org/stable/c/2f12b2c03c5dae1a0de0a9e5853177e3d6eee3c6"},{"url":"https://git.kernel.org/stable/c/68e738be5c518fc3c4e9146b66f67c8fee0135fb"},{"url":"https://git.kernel.org/stable/c/f5d4e04634c9cf68bdf23de08ada0bb92e8befe7"}],"title":"nilfs2: 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