{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68240",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-68240"
  ],
  "published": "2025-12-16T14:21:47Z",
  "summary": "nilfs2: avoid having an active sc_timer before freeing sci",
  "details": "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, 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",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-68240"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36049e81dc7f077e0e24d5b9688a7458beacef8f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2f65799e2a736d556d306440c4e1e8906736117a"
    },
    {
      "type": "FIX",
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}