[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2024-49867":6},{"stargazers_count":4,"fetched_at":5},7,"2026-06-04T08:53:30.047Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":16,"duplicates":21,"related":22,"reserved_at":9,"published_at":23,"modified_at":24,"state":9,"summary":25,"references_raw":27,"kevs":34,"epss":9,"epss_history":35,"metrics":36,"affected":43},"DEBIAN-CVE-2024-49867","In the Linux kernel, the following vulnerability has been resolved:  btrfs: wait for fixup workers before stopping cleaner kthread during umount  During unmount, at close_ctree(), we have the following steps in this order:  1) Park the cleaner kthread - this doesn't destroy the kthread, it basically    halts its execution (wake ups against it work but do nothing);  2) We stop the cleaner kthread - this results in freeing the respective    struct task_struct;  3) We call btrfs_stop_all_workers() which waits for any jobs running in all    the work queues and then free the work queues.  Syzbot reported a case where a fixup worker resulted in a crash when doing a delayed iput on its inode while attempting to wake up the cleaner at btrfs_add_delayed_iput(), because the task_struct of the cleaner kthread was already freed. This can happen during unmount because we don't wait for any fixup workers still running before we call kthread_stop() against the cleaner kthread, which stops and free all its resources.  Fix this by waiting for any fixup workers at close_ctree() before we call kthread_stop() against the cleaner and run pending delayed iputs.  The stack traces reported by syzbot were the following:    BUG: KASAN: slab-use-after-free in __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065   Read of size 8 at addr ffff8880272a8a18 by task kworker/u8:3/52    CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.12.0-rc1-syzkaller #0   Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024   Workqueue: btrfs-fixup btrfs_work_helper   Call Trace:    \u003CTASK>    __dump_stack lib/dump_stack.c:94 [inline]    dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120    print_address_description mm/kasan/report.c:377 [inline]    print_report+0x169/0x550 mm/kasan/report.c:488    kasan_report+0x143/0x180 mm/kasan/report.c:601    __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065    lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825    __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]    _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162    class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]    try_to_wake_up+0xb0/0x1480 kernel/sched/core.c:4154    btrfs_writepage_fixup_worker+0xc16/0xdf0 fs/btrfs/inode.c:2842    btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314    process_one_work kernel/workqueue.c:3229 [inline]    process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310    worker_thread+0x870/0xd30 kernel/workqueue.c:3391    kthread+0x2f0/0x390 kernel/kthread.c:389    ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244    \u003C/TASK>    Allocated by task 2:    kasan_save_stack mm/kasan/common.c:47 [inline]    kasan_save_track+0x3f/0x80 mm/kasan/common.c:68    unpoison_slab_object mm/kasan/common.c:319 [inline]    __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345    kasan_slab_alloc include/linux/kasan.h:247 [inline]    slab_post_alloc_hook mm/slub.c:4086 [inline]    slab_alloc_node mm/slub.c:4135 [inline]    kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4187    alloc_task_struct_node kernel/fork.c:180 [inline]    dup_task_struct+0x57/0x8c0 kernel/fork.c:1107    copy_process+0x5d1/0x3d50 kernel/fork.c:2206    kernel_clone+0x223/0x880 kernel/fork.c:2787    kernel_thread+0x1bc/0x240 kernel/fork.c:2849    create_kthread kernel/kthread.c:412 [inline]    kthreadd+0x60d/0x810 kernel/kthread.c:765    ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244    Freed by task 61:    kasan_save_stack mm/kasan/common.c:47 [inline]    kasan_save_track+0x3f/0x80 mm/kasan/common.c:68    kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579    poison_slab_object mm/kasan/common.c:247 [inline]    __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264    kasan_slab_free include/linux/kasan.h:230 [inline]    slab_free_h ---truncated---",null,[],[],[],[14],{"_key":15},"CVE-2024-49867",[17,19],{"_key":18},"DLA-4008-1",{"_key":20},"DLA-4075-1",[],[],"2024-10-21T18:15:06.403Z","2026-04-28T20:28:45.322112Z",{"cisa_kev":26,"cisa_ransomware":26,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[28],{"url":29,"sources":30,"tags":32},"https://security-tracker.debian.org/tracker/CVE-2024-49867",[31],"osv_debian",[33],"Advisory",[],[],[37],{"source":31,"cvss_v2_0":9,"cvss_v3_0":9,"cvss_v3_1":38,"cvss_v4_0":9},{"baseScore":39,"baseSeverity":9,"vectorString":40,"impactScore":41,"exploitabilityScore":42},5.5,"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",6,4.6,[44,63],{"ecosystem":45,"name":46,"vendor":47,"product":46,"cpe_part":9,"purl_type":48,"purl_namespace":47,"purl_name":46,"source":9,"versions":49},"Debian","linux","debian","deb",[50,56,59,62],{"version":51,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":54,"version_end_type":55,"fixed_in":9},"lt5_10_234_1",true,"ecosystem","5.10.234-1","excluding",{"version":57,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":58,"version_end_type":55,"fixed_in":9},"lt6_1_115_1","6.1.115-1",{"version":60,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":61,"version_end_type":55,"fixed_in":9},"lt6_11_4_1","6.11.4-1",{"version":60,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":61,"version_end_type":55,"fixed_in":9},{"ecosystem":45,"name":64,"vendor":47,"product":64,"cpe_part":9,"purl_type":48,"purl_namespace":47,"purl_name":64,"source":9,"versions":65},"linux-6.1",[66],{"version":67,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":68,"version_end_type":55,"fixed_in":9},"lt6_1_119_1~deb11u1","6.1.119-1~deb11u1"]