# CVE-2025-68240: linux: In the Linux kernel, the following vulnerability has been resolved:  nilfs2: avoid having an active sc_timer before f...

CVE-2025-68240 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-68240, released December 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-68240
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 16, 2025

## Description

In 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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.63-1 | [DEBIAN-CVE-2025-68240](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68240.md) | Dec 16, 2025 |
| Linux | linux Debian 14 | 6.17.9-1 | [DEBIAN-CVE-2025-68240](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68240.md) | Dec 16, 2025 |

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