{"id":"CVE-2025-68240","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: avoid having an active sc_timer before freeing sci\n\nBecause kthread_stop did not stop sc_task properly and returned -EINTR,\nthe sc_timer was not properly closed…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: avoid having an active sc_timer before freeing sci\n\nBecause kthread_stop did not stop sc_task properly and returned -EINTR,\nthe sc_timer was not properly closed…","severity":"none","published":"2025-12-16","updated":"2026-10-14","sourceUpdated":"2026-10-14T13:10:00.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-68240","references":[{"url":"https://git.kernel.org/stable/c/2f65799e2a736d556d306440c4e1e8906736117a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/36049e81dc7f077e0e24d5b9688a7458beacef8f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9a6b60cb147d53968753a34805211d2e5e08c027","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00184,"epssPercentile":0.07378,"ingestedAt":"2026-10-14T13:30:58.464Z","slug":"CVE-2025-68240","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: avoid having an active sc_timer before freeing sci\n\nBecause kthread_stop did not stop sc_task properly and returned -EINTR,\nthe sc_timer was not properly closed, ultimately causing the problem [1]\nreported by syzbot when freeing sci due to the sc_timer not being closed.\n\nBecause the thread sc_task main function nilfs_segctor_thread() returns 0\nwhen it succeeds, when the return value of kthread_stop() is not 0 in\nnilfs_segctor_destroy(), we believe that it has not properly closed\nsc_timer.\n\nWe use timer_shutdown_sync() to sync wait for sc_timer to shutdown, and\nset the value of sc_task to NULL under the protection of lock\nsc_state_lock, so as to avoid the issue caused by sc_timer not being\nproperly shutdowned.\n\n[1]\nODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: nilfs_construction_timeout\nCall trace:\n nilfs_segctor_destroy fs/nilfs2/segment.c:2811 [inline]\n nilfs_detach_log_writer+0x668/0x8cc fs/nilfs2/segment.c:2877\n nilfs_put_super+0x4c/0x12c fs/nilfs2/super.c:509\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}