{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-47691",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-47691"
  ],
  "published": "2024-10-21T12:02:02Z",
  "summary": "f2fs: fix to avoid use-after-free in f2fs_stop_gc_thread()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid use-after-free in f2fs_stop_gc_thread()\n\nsyzbot reports a f2fs bug as below:\n\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\n print_report+0xe8/0x550 mm/kasan/report.c:491\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n kasan_check_range+0x282/0x290 mm/kasan/generic.c:189\n instrument_atomic_read_write include/linux/instrumented.h:96 [inline]\n atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline]\n __refcount_add include/linux/refcount.h:184 [inline]\n __refcount_inc include/linux/refcount.h:241 [inline]\n refcount_inc include/linux/refcount.h:258 [inline]\n get_task_struct include/linux/sched/task.h:118 [inline]\n kthread_stop+0xca/0x630 kernel/kthread.c:704\n f2fs_stop_gc_thread+0x65/0xb0 fs/f2fs/gc.c:210\n f2fs_do_shutdown+0x192/0x540 fs/f2fs/file.c:2283\n f2fs_ioc_shutdown fs/f2fs/file.c:2325 [inline]\n __f2fs_ioctl+0x443a/0xbe60 fs/f2fs/file.c:4325\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe root cause is below race condition, it may cause use-after-free\nissue in sbi->gc_th pointer.\n\n- remount\n - f2fs_remount\n  - f2fs_stop_gc_thread\n   - kfree(gc_th)\n\t\t\t\t- f2fs_ioc_shutdown\n\t\t\t\t - f2fs_do_shutdown\n\t\t\t\t  - f2fs_stop_gc_thread\n\t\t\t\t   - kthread_stop(gc_th->f2fs_gc_task)\n   : sbi->gc_thread = NULL;\n\nWe will call f2fs_do_shutdown() in two paths:\n- for f2fs_ioc_shutdown() path, we should grab sb->s_umount semaphore\nfor fixing.\n- for f2fs_shutdown() path, it's safe since caller has already grabbed\nsb->s_umount semaphore.",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-47691"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fc18e655b62ac6bc9f12f5de0d749b4a3fe1e812"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7c339dee7eb0f8e4cadc317c595f898ef04dae30"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d79343cd66343709e409d96b2abb139a0a55ce34"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c7f114d864ac91515bb07ac271e9824a20f5ed95"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}