CVE-2023-52707 (GCVE-0-2023-52707)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:22 – Updated: 2026-05-11 19:32
VLAI?
Title
sched/psi: Fix use-after-free in ep_remove_wait_queue()
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/psi: Fix use-after-free in ep_remove_wait_queue() If a non-root cgroup gets removed when there is a thread that registered trigger and is polling on a pressure file within the cgroup, the polling waitqueue gets freed in the following path: do_rmdir cgroup_rmdir kernfs_drain_open_files cgroup_file_release cgroup_pressure_release psi_trigger_destroy However, the polling thread still has a reference to the pressure file and will access the freed waitqueue when the file is closed or upon exit: fput ep_eventpoll_release ep_free ep_remove_wait_queue remove_wait_queue This results in use-after-free as pasted below. The fundamental problem here is that cgroup_file_release() (and consequently waitqueue's lifetime) is not tied to the file's real lifetime. Using wake_up_pollfree() here might be less than ideal, but it is in line with the comment at commit 42288cb44c4b ("wait: add wake_up_pollfree()") since the waitqueue's lifetime is not tied to file's one and can be considered as another special case. While this would be fixable by somehow making cgroup_file_release() be tied to the fput(), it would require sizable refactoring at cgroups or higher layer which might be more justifiable if we identify more cases like this. BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0 Write of size 4 at addr ffff88810e625328 by task a.out/4404 CPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 #38 Hardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017 Call Trace: <TASK> dump_stack_lvl+0x73/0xa0 print_report+0x16c/0x4e0 kasan_report+0xc3/0xf0 kasan_check_range+0x2d2/0x310 _raw_spin_lock_irqsave+0x60/0xc0 remove_wait_queue+0x1a/0xa0 ep_free+0x12c/0x170 ep_eventpoll_release+0x26/0x30 __fput+0x202/0x400 task_work_run+0x11d/0x170 do_exit+0x495/0x1130 do_group_exit+0x100/0x100 get_signal+0xd67/0xde0 arch_do_signal_or_restart+0x2a/0x2b0 exit_to_user_mode_prepare+0x94/0x100 syscall_exit_to_user_mode+0x20/0x40 do_syscall_64+0x52/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Allocated by task 4404: kasan_set_track+0x3d/0x60 __kasan_kmalloc+0x85/0x90 psi_trigger_create+0x113/0x3e0 pressure_write+0x146/0x2e0 cgroup_file_write+0x11c/0x250 kernfs_fop_write_iter+0x186/0x220 vfs_write+0x3d8/0x5c0 ksys_write+0x90/0x110 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4407: kasan_set_track+0x3d/0x60 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x11d/0x170 slab_free_freelist_hook+0x87/0x150 __kmem_cache_free+0xcb/0x180 psi_trigger_destroy+0x2e8/0x310 cgroup_file_release+0x4f/0xb0 kernfs_drain_open_files+0x165/0x1f0 kernfs_drain+0x162/0x1a0 __kernfs_remove+0x1fb/0x310 kernfs_remove_by_name_ns+0x95/0xe0 cgroup_addrm_files+0x67f/0x700 cgroup_destroy_locked+0x283/0x3c0 cgroup_rmdir+0x29/0x100 kernfs_iop_rmdir+0xd1/0x140 vfs_rmdir+0xfe/0x240 do_rmdir+0x13d/0x280 __x64_sys_rmdir+0x2c/0x30 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0e94682b73bfa6c44c98af7a26771c9c08c055d5 , < 7caeb5457bd01ccba0df1d6f4872f20d28e50b38 (git)
Affected: 0e94682b73bfa6c44c98af7a26771c9c08c055d5 , < ec9c7aa08819f976b2492fa63c41b5712d2924b5 (git)
Affected: 0e94682b73bfa6c44c98af7a26771c9c08c055d5 , < cca2b3feb70170ef6f0fbc4b4d91eea235a2b73a (git)
Affected: 0e94682b73bfa6c44c98af7a26771c9c08c055d5 , < c6879a4dcefe92d870ab68cabaa9caeda4f2af5a (git)
Affected: 0e94682b73bfa6c44c98af7a26771c9c08c055d5 , < c2dbe32d5db5c4ead121cf86dabd5ab691fb47fe (git)
Create a notification for this product.
Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.4.232 , ≤ 5.4.* (semver)
Unaffected: 5.10.169 , ≤ 5.10.* (semver)
Unaffected: 5.15.95 , ≤ 5.15.* (semver)
Unaffected: 6.1.13 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/psi: Fix use-after-free in ep_remove_wait_queue()\\n\\nIf a non-root cgroup gets removed when there is a thread that registered\\ntrigger and is polling on a pressure file within the cgroup, the polling\\nwaitqueue gets freed in the following path:\\n\\n do_rmdir\\n   cgroup_rmdir\\n     kernfs_drain_open_files\\n       cgroup_file_release\\n         cgroup_pressure_release\\n           psi_trigger_destroy\\n\\nHowever, the polling thread still has a reference to the pressure file and\\nwill access the freed waitqueue when the file is closed or upon exit:\\n\\n fput\\n   ep_eventpoll_release\\n     ep_free\\n       ep_remove_wait_queue\\n         remove_wait_queue\\n\\nThis results in use-after-free as pasted below.\\n\\nThe fundamental problem here is that cgroup_file_release() (and\\nconsequently waitqueue\u0027s lifetime) is not tied to the file\u0027s real lifetime.\\nUsing wake_up_pollfree() here might be less than ideal, but it is in line\\nwith the comment at commit 42288cb44c4b (\\\"wait: add wake_up_pollfree()\\\")\\nsince the waitqueue\u0027s lifetime is not tied to file\u0027s one and can be\\nconsidered as another special case. While this would be fixable by somehow\\nmaking cgroup_file_release() be tied to the fput(), it would require\\nsizable refactoring at cgroups or higher layer which might be more\\njustifiable if we identify more cases like this.\\n\\n  BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0\\n  Write of size 4 at addr ffff88810e625328 by task a.out/4404\\n\\n\\tCPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 #38\\n\\tHardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017\\n\\tCall Trace:\\n\\t\u003cTASK\u003e\\n\\tdump_stack_lvl+0x73/0xa0\\n\\tprint_report+0x16c/0x4e0\\n\\tkasan_report+0xc3/0xf0\\n\\tkasan_check_range+0x2d2/0x310\\n\\t_raw_spin_lock_irqsave+0x60/0xc0\\n\\tremove_wait_queue+0x1a/0xa0\\n\\tep_free+0x12c/0x170\\n\\tep_eventpoll_release+0x26/0x30\\n\\t__fput+0x202/0x400\\n\\ttask_work_run+0x11d/0x170\\n\\tdo_exit+0x495/0x1130\\n\\tdo_group_exit+0x100/0x100\\n\\tget_signal+0xd67/0xde0\\n\\tarch_do_signal_or_restart+0x2a/0x2b0\\n\\texit_to_user_mode_prepare+0x94/0x100\\n\\tsyscall_exit_to_user_mode+0x20/0x40\\n\\tdo_syscall_64+0x52/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\t\u003c/TASK\u003e\\n\\n Allocated by task 4404:\\n\\n\\tkasan_set_track+0x3d/0x60\\n\\t__kasan_kmalloc+0x85/0x90\\n\\tpsi_trigger_create+0x113/0x3e0\\n\\tpressure_write+0x146/0x2e0\\n\\tcgroup_file_write+0x11c/0x250\\n\\tkernfs_fop_write_iter+0x186/0x220\\n\\tvfs_write+0x3d8/0x5c0\\n\\tksys_write+0x90/0x110\\n\\tdo_syscall_64+0x43/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\n Freed by task 4407:\\n\\n\\tkasan_set_track+0x3d/0x60\\n\\tkasan_save_free_info+0x27/0x40\\n\\t____kasan_slab_free+0x11d/0x170\\n\\tslab_free_freelist_hook+0x87/0x150\\n\\t__kmem_cache_free+0xcb/0x180\\n\\tpsi_trigger_destroy+0x2e8/0x310\\n\\tcgroup_file_release+0x4f/0xb0\\n\\tkernfs_drain_open_files+0x165/0x1f0\\n\\tkernfs_drain+0x162/0x1a0\\n\\t__kernfs_remove+0x1fb/0x310\\n\\tkernfs_remove_by_name_ns+0x95/0xe0\\n\\tcgroup_addrm_files+0x67f/0x700\\n\\tcgroup_destroy_locked+0x283/0x3c0\\n\\tcgroup_rmdir+0x29/0x100\\n\\tkernfs_iop_rmdir+0xd1/0x140\\n\\tvfs_rmdir+0xfe/0x240\\n\\tdo_rmdir+0x13d/0x280\\n\\t__x64_sys_rmdir+0x2c/0x30\\n\\tdo_syscall_64+0x43/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: sched/psi: corrige el use after free en ep_remove_wait_queue() si se elimina un cgroup no ra\\u00edz cuando hay un subproceso que registr\\u00f3 un activador y est\\u00e1 sondeando un archivo de presi\\u00f3n dentro en cgroup, la cola de espera de sondeo se libera en la siguiente ruta: do_rmdir cgroup_rmdir kernfs_drain_open_files cgroup_file_release cgroup_pression_release psi_trigger_destroy Sin embargo, el hilo de sondeo a\\u00fan tiene una referencia al archivo de presi\\u00f3n y acceder\\u00e1 a la cola de espera liberada cuando el archivo se cierre o al salir: fput ep_eventpoll_release ep_free ep_remove_wait_queue remove_wait_queue Esto da como resultado un use after free como se pega a continuaci\\u00f3n. El problema fundamental aqu\\u00ed es que cgroup_file_release() (y en consecuencia la vida \\u00fatil de la cola de espera) no est\\u00e1 ligada a la vida real del archivo. Usar wake_up_pollfree() aqu\\u00ed puede no ser ideal, pero est\\u00e1 en l\\u00ednea con el comentario en la confirmaci\\u00f3n 42288cb44c4b (\\\"espera: agregar wake_up_pollfree()\\\") ya que la vida \\u00fatil de la cola de espera no est\\u00e1 ligada a la del archivo y puede considerarse como otro caso especial. . Si bien esto se podr\\u00eda solucionar haciendo que cgroup_file_release() est\\u00e9 vinculado de alguna manera a fput(), requerir\\u00eda una refactorizaci\\u00f3n considerable en cgroups o en una capa superior, lo que podr\\u00eda ser m\\u00e1s justificable si identificamos m\\u00e1s casos como este. ERROR: KASAN: use-after-free en _raw_spin_lock_irqsave+0x60/0xc0 Escritura de tama\\u00f1o 4 en la direcci\\u00f3n ffff88810e625328 por tarea a.out/4404 CPU: 19 PID: 4404 Comm: a.out No contaminado 6.2.0-rc6 #38 Hardware nombre: Amazon EC2 c5a.8xlarge/, BIOS 1.0 16/10/2017 Seguimiento de llamadas:  dump_stack_lvl+0x73/0xa0 print_report+0x16c/0x4e0 kasan_report+0xc3/0xf0 kasan_check_range+0x2d2/0x310 _raw_spin_lock_irqsave+0x60/0x c0 remove_wait_queue+0x1a /0xa0 ep_free+0x12c/0x170 ep_eventpoll_release+0x26/0x30 __fput+0x202/0x400 task_work_run+0x11d/0x170 do_exit+0x495/0x1130 do_group_exit+0x100/0x100 get_signal+0xd67/0xde0 arch _do_signal_or_restart+0x2a/0x2b0 exit_to_user_mode_prepare+0x94/0x100 syscall_exit_to_user_mode+0x20 /0x40 do_syscall_64+0x52/0x90 Entry_SYSCALL_64_after_hwframe+0x63/0xcd  Asignado por tarea 4404: kasan_set_track+0x3d/0x60 __kasan_kmalloc+0x85/0x90 psi_trigger_create+0x113/0x3e0 Pressure_write+0x1 46/0x2e0 cgroup_file_write+0x11c/0x250 kernfs_fop_write_iter+0x186/ 0x220 vfs_write+0x3d8/0x5c0 ksys_write+0x90/0x110 do_syscall_64+0x43/0x90 Entry_SYSCALL_64_after_hwframe+0x63/0xcd Liberado por la tarea 4407: kasan_set_track+0x3d/0x60 kasan_save_free_info+0x27/ 0x40 ____kasan_slab_free+0x11d/0x170 slab_free_freelist_hook+0x87/0x150 __kmem_cache_free+0xcb/ 0x180 psi_trigger_destroy+0x2e8/0x310 cgroup_file_release+0x4f/0xb0 kernfs_drain_open_files+0x165/0x1f0 kernfs_drain+0x162/0x1a0 __kernfs_remove+0x1fb/0x310 ns+0x95/0xe0 cgroup_addrm_files+0x67f/0x700 cgroup_destroy_locked+0x283/0x3c0 cgroup_rmdir+0x29/0x100 kernfs_iop_rmdir+0xd1/ 0x140 vfs_rmdir+0xfe/0x240 do_rmdir+0x13d/0x280 __x64_sys_rmdir+0x2c/0x30 do_syscall_64+0x43/0x90 Entry_SYSCALL_64_after_hwframe+0x63/0xcd\"}]",
      "id": "CVE-2023-52707",
      "lastModified": "2025-01-06T20:39:33.220",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
      "published": "2024-05-21T16:15:12.993",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/7caeb5457bd01ccba0df1d6f4872f20d28e50b38\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c2dbe32d5db5c4ead121cf86dabd5ab691fb47fe\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c6879a4dcefe92d870ab68cabaa9caeda4f2af5a\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/cca2b3feb70170ef6f0fbc4b4d91eea235a2b73a\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ec9c7aa08819f976b2492fa63c41b5712d2924b5\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/7caeb5457bd01ccba0df1d6f4872f20d28e50b38\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c2dbe32d5db5c4ead121cf86dabd5ab691fb47fe\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/c6879a4dcefe92d870ab68cabaa9caeda4f2af5a\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/cca2b3feb70170ef6f0fbc4b4d91eea235a2b73a\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/ec9c7aa08819f976b2492fa63c41b5712d2924b5\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52707\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T16:15:12.993\",\"lastModified\":\"2025-01-06T20:39:33.220\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/psi: Fix use-after-free in ep_remove_wait_queue()\\n\\nIf a non-root cgroup gets removed when there is a thread that registered\\ntrigger and is polling on a pressure file within the cgroup, the polling\\nwaitqueue gets freed in the following path:\\n\\n do_rmdir\\n   cgroup_rmdir\\n     kernfs_drain_open_files\\n       cgroup_file_release\\n         cgroup_pressure_release\\n           psi_trigger_destroy\\n\\nHowever, the polling thread still has a reference to the pressure file and\\nwill access the freed waitqueue when the file is closed or upon exit:\\n\\n fput\\n   ep_eventpoll_release\\n     ep_free\\n       ep_remove_wait_queue\\n         remove_wait_queue\\n\\nThis results in use-after-free as pasted below.\\n\\nThe fundamental problem here is that cgroup_file_release() (and\\nconsequently waitqueue\u0027s lifetime) is not tied to the file\u0027s real lifetime.\\nUsing wake_up_pollfree() here might be less than ideal, but it is in line\\nwith the comment at commit 42288cb44c4b (\\\"wait: add wake_up_pollfree()\\\")\\nsince the waitqueue\u0027s lifetime is not tied to file\u0027s one and can be\\nconsidered as another special case. While this would be fixable by somehow\\nmaking cgroup_file_release() be tied to the fput(), it would require\\nsizable refactoring at cgroups or higher layer which might be more\\njustifiable if we identify more cases like this.\\n\\n  BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0\\n  Write of size 4 at addr ffff88810e625328 by task a.out/4404\\n\\n\\tCPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 #38\\n\\tHardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017\\n\\tCall Trace:\\n\\t\u003cTASK\u003e\\n\\tdump_stack_lvl+0x73/0xa0\\n\\tprint_report+0x16c/0x4e0\\n\\tkasan_report+0xc3/0xf0\\n\\tkasan_check_range+0x2d2/0x310\\n\\t_raw_spin_lock_irqsave+0x60/0xc0\\n\\tremove_wait_queue+0x1a/0xa0\\n\\tep_free+0x12c/0x170\\n\\tep_eventpoll_release+0x26/0x30\\n\\t__fput+0x202/0x400\\n\\ttask_work_run+0x11d/0x170\\n\\tdo_exit+0x495/0x1130\\n\\tdo_group_exit+0x100/0x100\\n\\tget_signal+0xd67/0xde0\\n\\tarch_do_signal_or_restart+0x2a/0x2b0\\n\\texit_to_user_mode_prepare+0x94/0x100\\n\\tsyscall_exit_to_user_mode+0x20/0x40\\n\\tdo_syscall_64+0x52/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\t\u003c/TASK\u003e\\n\\n Allocated by task 4404:\\n\\n\\tkasan_set_track+0x3d/0x60\\n\\t__kasan_kmalloc+0x85/0x90\\n\\tpsi_trigger_create+0x113/0x3e0\\n\\tpressure_write+0x146/0x2e0\\n\\tcgroup_file_write+0x11c/0x250\\n\\tkernfs_fop_write_iter+0x186/0x220\\n\\tvfs_write+0x3d8/0x5c0\\n\\tksys_write+0x90/0x110\\n\\tdo_syscall_64+0x43/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\n Freed by task 4407:\\n\\n\\tkasan_set_track+0x3d/0x60\\n\\tkasan_save_free_info+0x27/0x40\\n\\t____kasan_slab_free+0x11d/0x170\\n\\tslab_free_freelist_hook+0x87/0x150\\n\\t__kmem_cache_free+0xcb/0x180\\n\\tpsi_trigger_destroy+0x2e8/0x310\\n\\tcgroup_file_release+0x4f/0xb0\\n\\tkernfs_drain_open_files+0x165/0x1f0\\n\\tkernfs_drain+0x162/0x1a0\\n\\t__kernfs_remove+0x1fb/0x310\\n\\tkernfs_remove_by_name_ns+0x95/0xe0\\n\\tcgroup_addrm_files+0x67f/0x700\\n\\tcgroup_destroy_locked+0x283/0x3c0\\n\\tcgroup_rmdir+0x29/0x100\\n\\tkernfs_iop_rmdir+0xd1/0x140\\n\\tvfs_rmdir+0xfe/0x240\\n\\tdo_rmdir+0x13d/0x280\\n\\t__x64_sys_rmdir+0x2c/0x30\\n\\tdo_syscall_64+0x43/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: sched/psi: corrige el use after free en ep_remove_wait_queue() si se elimina un cgroup no ra\u00edz cuando hay un subproceso que registr\u00f3 un activador y est\u00e1 sondeando un archivo de presi\u00f3n dentro en cgroup, la cola de espera de sondeo se libera en la siguiente ruta: do_rmdir cgroup_rmdir kernfs_drain_open_files cgroup_file_release cgroup_pression_release psi_trigger_destroy Sin embargo, el hilo de sondeo a\u00fan tiene una referencia al archivo de presi\u00f3n y acceder\u00e1 a la cola de espera liberada cuando el archivo se cierre o al salir: fput ep_eventpoll_release ep_free ep_remove_wait_queue remove_wait_queue Esto da como resultado un use after free como se pega a continuaci\u00f3n. El problema fundamental aqu\u00ed es que cgroup_file_release() (y en consecuencia la vida \u00fatil de la cola de espera) no est\u00e1 ligada a la vida real del archivo. Usar wake_up_pollfree() aqu\u00ed puede no ser ideal, pero est\u00e1 en l\u00ednea con el comentario en la confirmaci\u00f3n 42288cb44c4b (\\\"espera: agregar wake_up_pollfree()\\\") ya que la vida \u00fatil de la cola de espera no est\u00e1 ligada a la del archivo y puede considerarse como otro caso especial. . Si bien esto se podr\u00eda solucionar haciendo que cgroup_file_release() est\u00e9 vinculado de alguna manera a fput(), requerir\u00eda una refactorizaci\u00f3n considerable en cgroups o en una capa superior, lo que podr\u00eda ser m\u00e1s justificable si identificamos m\u00e1s casos como este. ERROR: KASAN: use-after-free en _raw_spin_lock_irqsave+0x60/0xc0 Escritura de tama\u00f1o 4 en la direcci\u00f3n ffff88810e625328 por tarea a.out/4404 CPU: 19 PID: 4404 Comm: a.out No contaminado 6.2.0-rc6 #38 Hardware nombre: Amazon EC2 c5a.8xlarge/, BIOS 1.0 16/10/2017 Seguimiento de llamadas:  dump_stack_lvl+0x73/0xa0 print_report+0x16c/0x4e0 kasan_report+0xc3/0xf0 kasan_check_range+0x2d2/0x310 _raw_spin_lock_irqsave+0x60/0x c0 remove_wait_queue+0x1a /0xa0 ep_free+0x12c/0x170 ep_eventpoll_release+0x26/0x30 __fput+0x202/0x400 task_work_run+0x11d/0x170 do_exit+0x495/0x1130 do_group_exit+0x100/0x100 get_signal+0xd67/0xde0 arch _do_signal_or_restart+0x2a/0x2b0 exit_to_user_mode_prepare+0x94/0x100 syscall_exit_to_user_mode+0x20 /0x40 do_syscall_64+0x52/0x90 Entry_SYSCALL_64_after_hwframe+0x63/0xcd  Asignado por tarea 4404: kasan_set_track+0x3d/0x60 __kasan_kmalloc+0x85/0x90 psi_trigger_create+0x113/0x3e0 Pressure_write+0x1 46/0x2e0 cgroup_file_write+0x11c/0x250 kernfs_fop_write_iter+0x186/ 0x220 vfs_write+0x3d8/0x5c0 ksys_write+0x90/0x110 do_syscall_64+0x43/0x90 Entry_SYSCALL_64_after_hwframe+0x63/0xcd Liberado por la tarea 4407: kasan_set_track+0x3d/0x60 kasan_save_free_info+0x27/ 0x40 ____kasan_slab_free+0x11d/0x170 slab_free_freelist_hook+0x87/0x150 __kmem_cache_free+0xcb/ 0x180 psi_trigger_destroy+0x2e8/0x310 cgroup_file_release+0x4f/0xb0 kernfs_drain_open_files+0x165/0x1f0 kernfs_drain+0x162/0x1a0 __kernfs_remove+0x1fb/0x310 ns+0x95/0xe0 cgroup_addrm_files+0x67f/0x700 cgroup_destroy_locked+0x283/0x3c0 cgroup_rmdir+0x29/0x100 kernfs_iop_rmdir+0xd1/ 0x140 vfs_rmdir+0xfe/0x240 do_rmdir+0x13d/0x280 __x64_sys_rmdir+0x2c/0x30 do_syscall_64+0x43/0x90 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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7caeb5457bd01ccba0df1d6f4872f20d28e50b38\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/ec9c7aa08819f976b2492fa63c41b5712d2924b5\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/cca2b3feb70170ef6f0fbc4b4d91eea235a2b73a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c6879a4dcefe92d870ab68cabaa9caeda4f2af5a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c2dbe32d5db5c4ead121cf86dabd5ab691fb47fe\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T23:11:35.459Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-52707\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-17T17:37:08.537145Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T17:37:09.497Z\"}}], \"cna\": {\"title\": \"sched/psi: Fix use-after-free in ep_remove_wait_queue()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0e94682b73bfa6c44c98af7a26771c9c08c055d5\", \"lessThan\": \"7caeb5457bd01ccba0df1d6f4872f20d28e50b38\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0e94682b73bfa6c44c98af7a26771c9c08c055d5\", \"lessThan\": \"ec9c7aa08819f976b2492fa63c41b5712d2924b5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": 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\"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/psi: Fix use-after-free in ep_remove_wait_queue()\\n\\nIf a non-root cgroup gets removed when there is a thread that registered\\ntrigger and is polling on a pressure file within the cgroup, the polling\\nwaitqueue gets freed in the following path:\\n\\n do_rmdir\\n   cgroup_rmdir\\n     kernfs_drain_open_files\\n       cgroup_file_release\\n         cgroup_pressure_release\\n           psi_trigger_destroy\\n\\nHowever, the polling thread still has a reference to the pressure file and\\nwill access the freed waitqueue when the file is closed or upon exit:\\n\\n fput\\n   ep_eventpoll_release\\n     ep_free\\n       ep_remove_wait_queue\\n         remove_wait_queue\\n\\nThis results in use-after-free as pasted below.\\n\\nThe fundamental problem here is that cgroup_file_release() (and\\nconsequently waitqueue\u0027s lifetime) is not tied to the file\u0027s real lifetime.\\nUsing wake_up_pollfree() here might be less than ideal, but it is in line\\nwith the comment at commit 42288cb44c4b (\\\"wait: add wake_up_pollfree()\\\")\\nsince the waitqueue\u0027s lifetime is not tied to file\u0027s one and can be\\nconsidered as another special case. While this would be fixable by somehow\\nmaking cgroup_file_release() be tied to the fput(), it would require\\nsizable refactoring at cgroups or higher layer which might be more\\njustifiable if we identify more cases like this.\\n\\n  BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0\\n  Write of size 4 at addr ffff88810e625328 by task a.out/4404\\n\\n\\tCPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 #38\\n\\tHardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017\\n\\tCall Trace:\\n\\t\u003cTASK\u003e\\n\\tdump_stack_lvl+0x73/0xa0\\n\\tprint_report+0x16c/0x4e0\\n\\tkasan_report+0xc3/0xf0\\n\\tkasan_check_range+0x2d2/0x310\\n\\t_raw_spin_lock_irqsave+0x60/0xc0\\n\\tremove_wait_queue+0x1a/0xa0\\n\\tep_free+0x12c/0x170\\n\\tep_eventpoll_release+0x26/0x30\\n\\t__fput+0x202/0x400\\n\\ttask_work_run+0x11d/0x170\\n\\tdo_exit+0x495/0x1130\\n\\tdo_group_exit+0x100/0x100\\n\\tget_signal+0xd67/0xde0\\n\\tarch_do_signal_or_restart+0x2a/0x2b0\\n\\texit_to_user_mode_prepare+0x94/0x100\\n\\tsyscall_exit_to_user_mode+0x20/0x40\\n\\tdo_syscall_64+0x52/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\t\u003c/TASK\u003e\\n\\n Allocated by task 4404:\\n\\n\\tkasan_set_track+0x3d/0x60\\n\\t__kasan_kmalloc+0x85/0x90\\n\\tpsi_trigger_create+0x113/0x3e0\\n\\tpressure_write+0x146/0x2e0\\n\\tcgroup_file_write+0x11c/0x250\\n\\tkernfs_fop_write_iter+0x186/0x220\\n\\tvfs_write+0x3d8/0x5c0\\n\\tksys_write+0x90/0x110\\n\\tdo_syscall_64+0x43/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\n Freed by task 4407:\\n\\n\\tkasan_set_track+0x3d/0x60\\n\\tkasan_save_free_info+0x27/0x40\\n\\t____kasan_slab_free+0x11d/0x170\\n\\tslab_free_freelist_hook+0x87/0x150\\n\\t__kmem_cache_free+0xcb/0x180\\n\\tpsi_trigger_destroy+0x2e8/0x310\\n\\tcgroup_file_release+0x4f/0xb0\\n\\tkernfs_drain_open_files+0x165/0x1f0\\n\\tkernfs_drain+0x162/0x1a0\\n\\t__kernfs_remove+0x1fb/0x310\\n\\tkernfs_remove_by_name_ns+0x95/0xe0\\n\\tcgroup_addrm_files+0x67f/0x700\\n\\tcgroup_destroy_locked+0x283/0x3c0\\n\\tcgroup_rmdir+0x29/0x100\\n\\tkernfs_iop_rmdir+0xd1/0x140\\n\\tvfs_rmdir+0xfe/0x240\\n\\tdo_rmdir+0x13d/0x280\\n\\t__x64_sys_rmdir+0x2c/0x30\\n\\tdo_syscall_64+0x43/0x90\\n\\tentry_SYSCALL_64_after_hwframe+0x63/0xcd\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.232\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.169\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.95\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.13\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"5.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:42:03.735Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52707\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:42:03.735Z\", \"dateReserved\": \"2024-03-07T14:49:46.891Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:22:55.315Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.