nilfs2: avoid having an active sc_timer before freeing sci

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-68240
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-16 15:15:53 UTC
Updated2026-10-14 13:10:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nilfs2: avoid having an active sc_timer before freeing sci Because kthread_stop did not stop sc_task properly and returned -EINTR, the sc_timer was not properly closed, ultimately causing the problem [1] reported by syzbot when freeing sci due to the sc_timer not being closed. Because the thread sc_task main function nilfs_segctor_thread() returns 0 when it succeeds, when the return value of kthread_stop() is not 0 in nilfs_segctor_destroy(), we believe that it has not properly closed sc_timer. We use timer_shutdown_sync() to sync wait for sc_timer to shutdown, and set the value of sc_task to NULL under the protection of lock sc_state_lock, so as to avoid the issue caused by sc_timer not being properly shutdowned. [1] ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: nilfs_construction_timeout Call trace: nilfs_segctor_destroy fs/nilfs2/segment.c:2811 [inline] nilfs_detach_log_writer+0x668/0x8cc fs/nilfs2/segment.c:2877 nilfs_put_super+0x4c/0x12c fs/nilfs2/super.c:509

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3f66cc261ccb54a8e4d8d5aa51c389c19453b00c 36049e81dc7f077e0e24d5b9688a7458beacef8f git Not specified
CNA Linux Linux affected 3f66cc261ccb54a8e4d8d5aa51c389c19453b00c 2f65799e2a736d556d306440c4e1e8906736117a git Not specified
CNA Linux Linux affected 3f66cc261ccb54a8e4d8d5aa51c389c19453b00c 9a6b60cb147d53968753a34805211d2e5e08c027 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.59 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.9 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/36049e81dc7f077e0e24d5b9688a7458beacef8f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f65799e2a736d556d306440c4e1e8906736117a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a6b60cb147d53968753a34805211d2e5e08c027 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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