Vulnerability-Lookup

OESA-2025-1669 (CVE-2024-57896)

Vulnerability from osv_openeuler – Published: 2025-06-27 11:08 – Updated: 2026-08-06 11:08 – Source website

Summary

kernel security update

Details

The Linux Kernel, the operating system core itself.

Security Fix(es):

In the Linux kernel, the following vulnerability has been resolved:

btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount

During the unmount path, at close_ctree(), we first stop the cleaner kthread, using kthread_stop() which frees the associated task_struct, and then stop and destroy all the work queues. However after we stopped the cleaner we may still have a worker from the delalloc_workers queue running inode.c:submit_compressed_extents(), which calls btrfs_add_delayed_iput(), which in turn tries to wake up the cleaner kthread - which was already destroyed before, resulting in a use-after-free on the task_struct.

Syzbot reported this with the following stack traces:

BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089 Read of size 8 at addr ffff8880259d2818 by task kworker/u8:3/52

CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.13.0-rc1-syzkaller-00002-gcdd30ebb1b9f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: btrfs-delalloc btrfs_work_helper Call Trace: <TASK> __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:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __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+0xc2/0x1470 kernel/sched/core.c:4205 submit_compressed_extents+0xdf/0x16e0 fs/btrfs/inode.c:1615 run_ordered_work fs/btrfs/async-thread.c:288 [inline] btrfs_work_helper+0x96f/0xc40 fs/btrfs/async-thread.c:324 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 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 </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:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct+0x57/0x8c0 kernel/fork.c:1113 copy_process+0x5d1/0x3d50 kernel/fork.c:2225 kernel_clone+0x223/0x870 kernel/fork.c:2807 kernel_thread+0x1bc/0x240 kernel/fork.c:2869 create_kthread kernel/kthread.c:412 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:767 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 24: 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:582 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:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kmem_cache_free+0x195/0x410 mm/slub.c:4700 put_task_struct include/linux/sched/task.h:144 [inline] delayed_put_task_struct+0x125/0x300 kernel/exit.c:227 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:943

---truncated---(CVE-2024-57896)

Severity

7.8 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2024-57896	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "bpftool-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "bpftool-debuginfo-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-debuginfo-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-debugsource-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-devel-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-headers-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-source-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-tools-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-tools-debuginfo-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "kernel-tools-devel-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "perf-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "perf-debuginfo-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "python3-perf-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm",
          "python3-perf-debuginfo-6.6.0-98.0.0.101.oe2403sp1.aarch64.rpm"
        ],
        "src": [
          "kernel-6.6.0-98.0.0.101.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "bpftool-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "bpftool-debuginfo-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-debuginfo-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-debugsource-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-devel-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-headers-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-source-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-tools-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-tools-debuginfo-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "kernel-tools-devel-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "perf-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "perf-debuginfo-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "python3-perf-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm",
          "python3-perf-debuginfo-6.6.0-98.0.0.101.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "kernel",
        "purl": "pkg:rpm/openEuler/kernel\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.0-98.0.0.101.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: flush delalloc workers queue before stopping cleaner kthread during unmount\n\nDuring the unmount path, at close_ctree(), we first stop the cleaner\nkthread, using kthread_stop() which frees the associated task_struct, and\nthen stop and destroy all the work queues. However after we stopped the\ncleaner we may still have a worker from the delalloc_workers queue running\ninode.c:submit_compressed_extents(), which calls btrfs_add_delayed_iput(),\nwhich in turn tries to wake up the cleaner kthread - which was already\ndestroyed before, resulting in a use-after-free on the task_struct.\n\nSyzbot reported this with the following stack traces:\n\n  BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089\n  Read of size 8 at addr ffff8880259d2818 by task kworker/u8:3/52\n\n  CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.13.0-rc1-syzkaller-00002-gcdd30ebb1b9f #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\n  Workqueue: btrfs-delalloc btrfs_work_helper\n  Call Trace:\n   \u0026lt;TASK\u0026gt;\n   __dump_stack lib/dump_stack.c:94 [inline]\n   dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n   print_address_description mm/kasan/report.c:378 [inline]\n   print_report+0x169/0x550 mm/kasan/report.c:489\n   kasan_report+0x143/0x180 mm/kasan/report.c:602\n   __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089\n   lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849\n   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n   _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162\n   class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]\n   try_to_wake_up+0xc2/0x1470 kernel/sched/core.c:4205\n   submit_compressed_extents+0xdf/0x16e0 fs/btrfs/inode.c:1615\n   run_ordered_work fs/btrfs/async-thread.c:288 [inline]\n   btrfs_work_helper+0x96f/0xc40 fs/btrfs/async-thread.c:324\n   process_one_work kernel/workqueue.c:3229 [inline]\n   process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310\n   worker_thread+0x870/0xd30 kernel/workqueue.c:3391\n   kthread+0x2f0/0x390 kernel/kthread.c:389\n   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n   \u0026lt;/TASK\u0026gt;\n\n  Allocated by task 2:\n   kasan_save_stack mm/kasan/common.c:47 [inline]\n   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n   unpoison_slab_object mm/kasan/common.c:319 [inline]\n   __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345\n   kasan_slab_alloc include/linux/kasan.h:250 [inline]\n   slab_post_alloc_hook mm/slub.c:4104 [inline]\n   slab_alloc_node mm/slub.c:4153 [inline]\n   kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205\n   alloc_task_struct_node kernel/fork.c:180 [inline]\n   dup_task_struct+0x57/0x8c0 kernel/fork.c:1113\n   copy_process+0x5d1/0x3d50 kernel/fork.c:2225\n   kernel_clone+0x223/0x870 kernel/fork.c:2807\n   kernel_thread+0x1bc/0x240 kernel/fork.c:2869\n   create_kthread kernel/kthread.c:412 [inline]\n   kthreadd+0x60d/0x810 kernel/kthread.c:767\n   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\n  Freed by task 24:\n   kasan_save_stack mm/kasan/common.c:47 [inline]\n   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n   kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582\n   poison_slab_object mm/kasan/common.c:247 [inline]\n   __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264\n   kasan_slab_free include/linux/kasan.h:233 [inline]\n   slab_free_hook mm/slub.c:2338 [inline]\n   slab_free mm/slub.c:4598 [inline]\n   kmem_cache_free+0x195/0x410 mm/slub.c:4700\n   put_task_struct include/linux/sched/task.h:144 [inline]\n   delayed_put_task_struct+0x125/0x300 kernel/exit.c:227\n   rcu_do_batch kernel/rcu/tree.c:2567 [inline]\n   rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823\n   handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:554\n   run_ksoftirqd+0xca/0x130 kernel/softirq.c:943\n  \n---truncated---(CVE-2024-57896)",
  "id": "OESA-2025-1669",
  "modified": "2026-08-06T11:08:45Z",
  "published": "2025-06-27T11:08:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1669"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-57896"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kernel security update",
  "upstream": [
    "CVE-2024-57896"
  ]
}

CVE-2024-57896 (GCVE-0-2024-57896)

Vulnerability from cvelistv5 – Published: 2025-01-15 13:05 – Updated: 2026-08-05 11:46

Title

btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount During the unmount path, at close_ctree(), we first stop the cleaner kthread, using kthread_stop() which frees the associated task_struct, and then stop and destroy all the work queues. However after we stopped the cleaner we may still have a worker from the delalloc_workers queue running inode.c:submit_compressed_extents(), which calls btrfs_add_delayed_iput(), which in turn tries to wake up the cleaner kthread - which was already destroyed before, resulting in a use-after-free on the task_struct. Syzbot reported this with the following stack traces: BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089 Read of size 8 at addr ffff8880259d2818 by task kworker/u8:3/52 CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.13.0-rc1-syzkaller-00002-gcdd30ebb1b9f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: btrfs-delalloc btrfs_work_helper Call Trace: <TASK> __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:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __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+0xc2/0x1470 kernel/sched/core.c:4205 submit_compressed_extents+0xdf/0x16e0 fs/btrfs/inode.c:1615 run_ordered_work fs/btrfs/async-thread.c:288 [inline] btrfs_work_helper+0x96f/0xc40 fs/btrfs/async-thread.c:324 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 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 </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:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct+0x57/0x8c0 kernel/fork.c:1113 copy_process+0x5d1/0x3d50 kernel/fork.c:2225 kernel_clone+0x223/0x870 kernel/fork.c:2807 kernel_thread+0x1bc/0x240 kernel/fork.c:2869 create_kthread kernel/kthread.c:412 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:767 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 24: 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:582 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:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kmem_cache_free+0x195/0x410 mm/slub.c:4700 put_task_struct include/linux/sched/task.h:144 [inline] delayed_put_task_struct+0x125/0x300 kernel/exit.c:227 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:943 ---truncated---

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-11 15:40 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/a2718ed1eb8c3611b…
https://git.kernel.org/stable/c/63f4b594a688bf922…
https://git.kernel.org/stable/c/1ea629e7bb2fb4055…
https://git.kernel.org/stable/c/35916b2f96505a18d…
https://git.kernel.org/stable/c/d77a3a99b53d12c06…
https://git.kernel.org/stable/c/f10bef73fb355e3fc…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fd340d0f68cc87badfc9efcb226f23a5428826a0 , < a2718ed1eb8c3611b63f8933c7e68c8821fe2808 (git) Affected: fd340d0f68cc87badfc9efcb226f23a5428826a0 , < 63f4b594a688bf922e8691f0784679aa7af7988c (git) Affected: fd340d0f68cc87badfc9efcb226f23a5428826a0 , < 1ea629e7bb2fb40555e5e01a1b5095df31287017 (git) Affected: fd340d0f68cc87badfc9efcb226f23a5428826a0 , < 35916b2f96505a18dc7242a115611b718d9de725 (git) Affected: fd340d0f68cc87badfc9efcb226f23a5428826a0 , < d77a3a99b53d12c061c007cdc96df38825dee476 (git) Affected: fd340d0f68cc87badfc9efcb226f23a5428826a0 , < f10bef73fb355e3fc85e63a50386798be68ff486 (git)
Linux	Linux	Affected: 5.0 Unaffected: 0 , < 5.0 (semver) Unaffected: 5.10.233 , ≤ 5.10.* (semver) Unaffected: 5.15.176 , ≤ 5.15.* (semver) Unaffected: 6.1.124 , ≤ 6.1.* (semver) Unaffected: 6.6.70 , ≤ 6.6.* (semver) Unaffected: 6.12.9 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-57896",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-11T15:40:57.951586Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-11T15:45:19.574Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:55:11.913Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/disk-io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a2718ed1eb8c3611b63f8933c7e68c8821fe2808",
              "status": "affected",
              "version": "fd340d0f68cc87badfc9efcb226f23a5428826a0",
              "versionType": "git"
            },
            {
              "lessThan": "63f4b594a688bf922e8691f0784679aa7af7988c",
              "status": "affected",
              "version": "fd340d0f68cc87badfc9efcb226f23a5428826a0",
              "versionType": "git"
            },
            {
              "lessThan": "1ea629e7bb2fb40555e5e01a1b5095df31287017",
              "status": "affected",
              "version": "fd340d0f68cc87badfc9efcb226f23a5428826a0",
              "versionType": "git"
            },
            {
              "lessThan": "35916b2f96505a18dc7242a115611b718d9de725",
              "status": "affected",
              "version": "fd340d0f68cc87badfc9efcb226f23a5428826a0",
              "versionType": "git"
            },
            {
              "lessThan": "d77a3a99b53d12c061c007cdc96df38825dee476",
              "status": "affected",
              "version": "fd340d0f68cc87badfc9efcb226f23a5428826a0",
              "versionType": "git"
            },
            {
              "lessThan": "f10bef73fb355e3fc85e63a50386798be68ff486",
              "status": "affected",
              "version": "fd340d0f68cc87badfc9efcb226f23a5428826a0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/disk-io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.233",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.124",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.70",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.233",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.176",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.124",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.70",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.9",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: flush delalloc workers queue before stopping cleaner kthread during unmount\n\nDuring the unmount path, at close_ctree(), we first stop the cleaner\nkthread, using kthread_stop() which frees the associated task_struct, and\nthen stop and destroy all the work queues. However after we stopped the\ncleaner we may still have a worker from the delalloc_workers queue running\ninode.c:submit_compressed_extents(), which calls btrfs_add_delayed_iput(),\nwhich in turn tries to wake up the cleaner kthread - which was already\ndestroyed before, resulting in a use-after-free on the task_struct.\n\nSyzbot reported this with the following stack traces:\n\n  BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089\n  Read of size 8 at addr ffff8880259d2818 by task kworker/u8:3/52\n\n  CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.13.0-rc1-syzkaller-00002-gcdd30ebb1b9f #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\n  Workqueue: btrfs-delalloc btrfs_work_helper\n  Call Trace:\n   \u003cTASK\u003e\n   __dump_stack lib/dump_stack.c:94 [inline]\n   dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n   print_address_description mm/kasan/report.c:378 [inline]\n   print_report+0x169/0x550 mm/kasan/report.c:489\n   kasan_report+0x143/0x180 mm/kasan/report.c:602\n   __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089\n   lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849\n   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n   _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162\n   class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]\n   try_to_wake_up+0xc2/0x1470 kernel/sched/core.c:4205\n   submit_compressed_extents+0xdf/0x16e0 fs/btrfs/inode.c:1615\n   run_ordered_work fs/btrfs/async-thread.c:288 [inline]\n   btrfs_work_helper+0x96f/0xc40 fs/btrfs/async-thread.c:324\n   process_one_work kernel/workqueue.c:3229 [inline]\n   process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310\n   worker_thread+0x870/0xd30 kernel/workqueue.c:3391\n   kthread+0x2f0/0x390 kernel/kthread.c:389\n   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n   \u003c/TASK\u003e\n\n  Allocated by task 2:\n   kasan_save_stack mm/kasan/common.c:47 [inline]\n   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n   unpoison_slab_object mm/kasan/common.c:319 [inline]\n   __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345\n   kasan_slab_alloc include/linux/kasan.h:250 [inline]\n   slab_post_alloc_hook mm/slub.c:4104 [inline]\n   slab_alloc_node mm/slub.c:4153 [inline]\n   kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205\n   alloc_task_struct_node kernel/fork.c:180 [inline]\n   dup_task_struct+0x57/0x8c0 kernel/fork.c:1113\n   copy_process+0x5d1/0x3d50 kernel/fork.c:2225\n   kernel_clone+0x223/0x870 kernel/fork.c:2807\n   kernel_thread+0x1bc/0x240 kernel/fork.c:2869\n   create_kthread kernel/kthread.c:412 [inline]\n   kthreadd+0x60d/0x810 kernel/kthread.c:767\n   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\n  Freed by task 24:\n   kasan_save_stack mm/kasan/common.c:47 [inline]\n   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n   kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582\n   poison_slab_object mm/kasan/common.c:247 [inline]\n   __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264\n   kasan_slab_free include/linux/kasan.h:233 [inline]\n   slab_free_hook mm/slub.c:2338 [inline]\n   slab_free mm/slub.c:4598 [inline]\n   kmem_cache_free+0x195/0x410 mm/slub.c:4700\n   put_task_struct include/linux/sched/task.h:144 [inline]\n   delayed_put_task_struct+0x125/0x300 kernel/exit.c:227\n   rcu_do_batch kernel/rcu/tree.c:2567 [inline]\n   rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823\n   handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:554\n   run_ksoftirqd+0xca/0x130 kernel/softirq.c:943\n  \n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attack requires local access to write compressed data to a mounted btrfs filesystem and the local unmount path (`umount(2)` \u2192 `close_ctree()`); there is no remote protocol handler involved.\nAC:L - The attacker fully controls one side of the race and can keep the `delalloc_workers` queue continuously saturated with compressed writeback so that a worker is essentially always in flight, making the UAF fire on any unmount rather than requiring a narrow timing window; where the attacker can also trigger the unmount (removable media via udisks2, container teardown) they control both sides.\nPR:L - Generating the compressed delalloc work needs only an unprivileged user with write access to a btrfs mount \u2014 per-inode compression is settable by the file owner via `chattr +c` (`inode_owner_or_capable`), and many distros mount with `compress=zstd` by default.\nUI:N - No victim action is needed; the unmount that closes the race occurs automatically at shutdown, on container teardown, or on media eject, and in the removable-media case the attacker performs it themselves.\nS:U - The use-after-free is on a kernel `task_struct` and impacts only the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `task_struct` slab object can be reallocated with attacker-groomed content, and the wakeup path reads scheduler fields and pointers from it, giving a path to kernel memory disclosure.\nI:H - `try_to_wake_up()` writes into the freed object (`pi_lock` acquisition, `__state`/`on_rq` updates) and performs indirect calls through `p-\u003esched_class`, providing write and control-flow-hijack primitives on a sprayable slab.\nA:H - The bug is a KASAN-confirmed slab-use-after-free reported by syzbot that reliably oopses or panics the kernel during unmount."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:46:49.998Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a2718ed1eb8c3611b63f8933c7e68c8821fe2808"
        },
        {
          "url": "https://git.kernel.org/stable/c/63f4b594a688bf922e8691f0784679aa7af7988c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ea629e7bb2fb40555e5e01a1b5095df31287017"
        },
        {
          "url": "https://git.kernel.org/stable/c/35916b2f96505a18dc7242a115611b718d9de725"
        },
        {
          "url": "https://git.kernel.org/stable/c/d77a3a99b53d12c061c007cdc96df38825dee476"
        },
        {
          "url": "https://git.kernel.org/stable/c/f10bef73fb355e3fc85e63a50386798be68ff486"
        }
      ],
      "title": "btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-57896",
    "datePublished": "2025-01-15T13:05:48.310Z",
    "dateReserved": "2025-01-11T14:45:42.029Z",
    "dateUpdated": "2026-08-05T11:46:49.998Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.