CVE-2024-26987

Estado: ModificadaMedia (5.5)—

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

mm/memory-failure: fix deadlock when hugetlb_optimize_vmemmap is enabled

When I did hard offline test with hugetlb pages, below deadlock occurs:

====================================================== WARNING: possible circular locking dependency detected 6.8.0-11409-gf6cef5f8c37f #1 Not tainted ------------------------------------------------------ bash/46904 is trying to acquire lock: ffffffffabe68910 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_slow_dec+0x16/0x60

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

Leer descripción completaMostrar menos

other info that might help us debug this:

Possible unsafe locking scenario:

*** DEADLOCK ***

In short, below scene breaks the ---truncated---

Detalles técnicos trazas, registros y código del informe original

but task is already holding lock:
ffffffffabf92ea8 (pcp_batch_high_lock){+.+.}-{3:3}, at: zone_pcp_disable+0x16/0x40

-> #1 (pcp_batch_high_lock){+.+.}-{3:3}:
       __mutex_lock+0x6c/0x770
       page_alloc_cpu_online+0x3c/0x70
       cpuhp_invoke_callback+0x397/0x5f0
       __cpuhp_invoke_callback_range+0x71/0xe0
       _cpu_up+0xeb/0x210
       cpu_up+0x91/0xe0
       cpuhp_bringup_mask+0x49/0xb0
       bringup_nonboot_cpus+0xb7/0xe0
       smp_init+0x25/0xa0
       kernel_init_freeable+0x15f/0x3e0
       kernel_init+0x15/0x1b0
       ret_from_fork+0x2f/0x50
       ret_from_fork_asm+0x1a/0x30

-> #0 (cpu_hotplug_lock){++++}-{0:0}:
       __lock_acquire+0x1298/0x1cd0
       lock_acquire+0xc0/0x2b0
       cpus_read_lock+0x2a/0xc0
       static_key_slow_dec+0x16/0x60
       __hugetlb_vmemmap_restore_folio+0x1b9/0x200
       dissolve_free_huge_page+0x211/0x260
       __page_handle_poison+0x45/0xc0
       memory_failure+0x65e/0xc70
       hard_offline_page_store+0x55/0xa0
       kernfs_fop_write_iter+0x12c/0x1d0
       vfs_write+0x387/0x550
       ksys_write+0x64/0xe0
       do_syscall_64+0xca/0x1e0
       entry_SYSCALL_64_after_hwframe+0x6d/0x75

       CPU0                    CPU1
       ----                    ----
  lock(pcp_batch_high_lock);
                               lock(cpu_hotplug_lock);
                               lock(pcp_batch_high_lock);
  rlock(cpu_hotplug_lock);

5 locks held by bash/46904:
 #0: ffff98f6c3bb23f0 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x64/0xe0
 #1: ffff98f6c328e488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0xf8/0x1d0
 #2: ffff98ef83b31890 (kn->active#113){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x100/0x1d0
 #3: ffffffffabf9db48 (mf_mutex){+.+.}-{3:3}, at: memory_failure+0x44/0xc70
 #4: ffffffffabf92ea8 (pcp_batch_high_lock){+.+.}-{3:3}, at: zone_pcp_disable+0x16/0x40

stack backtrace:
CPU: 10 PID: 46904 Comm: bash Kdump: loaded Not tainted 6.8.0-11409-gf6cef5f8c37f #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x68/0xa0
 check_noncircular+0x129/0x140
 __lock_acquire+0x1298/0x1cd0
 lock_acquire+0xc0/0x2b0
 cpus_read_lock+0x2a/0xc0
 static_key_slow_dec+0x16/0x60
 __hugetlb_vmemmap_restore_folio+0x1b9/0x200
 dissolve_free_huge_page+0x211/0x260
 __page_handle_poison+0x45/0xc0
 memory_failure+0x65e/0xc70
 hard_offline_page_store+0x55/0xa0
 kernfs_fop_write_iter+0x12c/0x1d0
 vfs_write+0x387/0x550
 ksys_write+0x64/0xe0
 do_syscall_64+0xca/0x1e0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fc862314887
Code: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
RSP: 002b:00007fff19311268 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007fc862314887
RDX: 000000000000000c RSI: 000056405645fe10 RDI: 0000000000000001
RBP: 000056405645fe10 R08: 00007fc8623d1460 R09: 000000007fffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c
R13: 00007fc86241b780 R14: 00007fc862417600 R15: 00007fc862416a00

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.18%
Percentil entre todas las CVEs puntuadas: 6
Fecha de la puntuación: 7/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Fedoraproject — Fedora Linux — Linux Kernel

CWE

CWE-667

Referencias

JSON original (NVD)

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/memory-failure: fix deadlock when hugetlb_optimize_vmemmap is enabled\n\nWhen I did hard offline test with hugetlb pages, below deadlock occurs:\n\n======================================================\nWARNING: possible circular locking dependency detected\n6.8.0-11409-gf6cef5f8c37f #1 Not tainted\n------------------------------------------------------\nbash/46904 is trying to acquire lock:\nffffffffabe68910 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_slow_dec+0x16/0x60\n\nbut task is already holding lock:\nffffffffabf92ea8 (pcp_batch_high_lock){+.+.}-{3:3}, at: zone_pcp_disable+0x16/0x40\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-> #1 (pcp_batch_high_lock){+.+.}-{3:3}:\n       __mutex_lock+0x6c/0x770\n       page_alloc_cpu_online+0x3c/0x70\n       cpuhp_invoke_callback+0x397/0x5f0\n       __cpuhp_invoke_callback_range+0x71/0xe0\n       _cpu_up+0xeb/0x210\n       cpu_up+0x91/0xe0\n       cpuhp_bringup_mask+0x49/0xb0\n       bringup_nonboot_cpus+0xb7/0xe0\n       smp_init+0x25/0xa0\n       kernel_init_freeable+0x15f/0x3e0\n       kernel_init+0x15/0x1b0\n       ret_from_fork+0x2f/0x50\n       ret_from_fork_asm+0x1a/0x30\n\n-> #0 (cpu_hotplug_lock){++++}-{0:0}:\n       __lock_acquire+0x1298/0x1cd0\n       lock_acquire+0xc0/0x2b0\n       cpus_read_lock+0x2a/0xc0\n       static_key_slow_dec+0x16/0x60\n       __hugetlb_vmemmap_restore_folio+0x1b9/0x200\n       dissolve_free_huge_page+0x211/0x260\n       __page_handle_poison+0x45/0xc0\n       memory_failure+0x65e/0xc70\n       hard_offline_page_store+0x55/0xa0\n       kernfs_fop_write_iter+0x12c/0x1d0\n       vfs_write+0x387/0x550\n       ksys_write+0x64/0xe0\n       do_syscall_64+0xca/0x1e0\n       entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(pcp_batch_high_lock);\n                               lock(cpu_hotplug_lock);\n                               lock(pcp_batch_high_lock);\n  rlock(cpu_hotplug_lock);\n\n *** DEADLOCK ***\n\n5 locks held by bash/46904:\n #0: ffff98f6c3bb23f0 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x64/0xe0\n #1: ffff98f6c328e488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0xf8/0x1d0\n #2: ffff98ef83b31890 (kn->active#113){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x100/0x1d0\n #3: ffffffffabf9db48 (mf_mutex){+.+.}-{3:3}, at: memory_failure+0x44/0xc70\n #4: ffffffffabf92ea8 (pcp_batch_high_lock){+.+.}-{3:3}, at: zone_pcp_disable+0x16/0x40\n\nstack backtrace:\nCPU: 10 PID: 46904 Comm: bash Kdump: loaded Not tainted 6.8.0-11409-gf6cef5f8c37f #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\nCall Trace:\n <TASK>\n dump_stack_lvl+0x68/0xa0\n check_noncircular+0x129/0x140\n __lock_acquire+0x1298/0x1cd0\n lock_acquire+0xc0/0x2b0\n cpus_read_lock+0x2a/0xc0\n static_key_slow_dec+0x16/0x60\n __hugetlb_vmemmap_restore_folio+0x1b9/0x200\n dissolve_free_huge_page+0x211/0x260\n __page_handle_poison+0x45/0xc0\n memory_failure+0x65e/0xc70\n hard_offline_page_store+0x55/0xa0\n kernfs_fop_write_iter+0x12c/0x1d0\n vfs_write+0x387/0x550\n ksys_write+0x64/0xe0\n do_syscall_64+0xca/0x1e0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\nRIP: 0033:0x7fc862314887\nCode: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24\nRSP: 002b:00007fff19311268 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\nRAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007fc862314887\nRDX: 000000000000000c RSI: 000056405645fe10 RDI: 0000000000000001\nRBP: 000056405645fe10 R08: 00007fc8623d1460 R09: 000000007fffffff\nR10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c\nR13: 00007fc86241b780 R14: 00007fc862417600 R15: 00007fc862416a00\n\nIn short, below scene breaks the \n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mm/memory-failure: corrige el interbloqueo cuando Hugetlb_optimize_vmemmap está habilitado Cuando hice una prueba dura sin conexión con páginas de Hugetlb, se produce el siguiente interbloqueo: ============ ========================================== ADVERTENCIA: posible dependencia de bloqueo circular detectada 6.8 .0-11409-gf6cef5f8c37f #1 No contaminado ---------------------------------------- -------------- bash/46904 está intentando adquirir el bloqueo: ffffffffabe68910 (cpu_hotplug_lock){++++}-{0:0}, en: static_key_slow_dec+0x16/0x60 pero la tarea está ya mantiene el bloqueo: ffffffffabf92ea8 (pcp_batch_high_lock){+.+.}-{3:3}, en: zone_pcp_disable+0x16/0x40 cuyo bloqueo ya depende del nuevo bloqueo. la cadena de dependencia existente (en orden inverso) es: -&gt; #1 (pcp_batch_high_lock){+.+.}-{3:3}: __mutex_lock+0x6c/0x770 page_alloc_cpu_online+0x3c/0x70 cpuhp_invoke_callback+0x397/0x5f0 __cpuhp_invoke_callback_range+0x71/ 0xe0 _cpu_up+0xeb/0x210 cpu_up+0x91/0xe0 cpuhp_bringup_mask+0x49/0xb0 Bringup_nonboot_cpus+0xb7/0xe0 smp_init+0x25/0xa0 kernel_init_freeable+0x15f/0x3e0 kernel_init+0x15/0x1b0 t_from_fork+0x2f/0x50 ret_from_fork_asm+0x1a/0x30 -&gt; #0 (cpu_hotplug_lock){++++}-{0:0}: __lock_acquire+0x1298/0x1cd0 lock_acquire+0xc0/0x2b0 cpus_read_lock+0x2a/0xc0 static_key_slow_dec+0x16/0x60 __hugetlb_vmemmap_restore_folio+0x1b9/0x200 dissolve_free_huge _página+0x211/0x260 __página_handle_poison+0x45/ 0xc0 error_de_memoria+0x65e/0xc70 hard_offline_page_store+0x55/0xa0 kernfs_fop_write_iter+0x12c/0x1d0 vfs_write+0x387/0x550 ksys_write+0x64/0xe0 do_syscall_64+0xca/0x1e0 entrada_SYSCALL_6 4_after_hwframe+0x6d/0x75 otra información que podría ayudarnos a depurar esto: Posible escenario de bloqueo inseguro: CPU0 CPU1 ---- ---- bloqueo(pcp_batch_high_lock); bloquear(cpu_hotplug_lock); bloquear(pcp_batch_high_lock); rlock(cpu_hotplug_lock); *** DEADLOCK *** 5 bloqueos retenidos por bash/46904: #0: ffff98f6c3bb23f0 (sb_writers#5){.+.+}-{0:0}, en: ksys_write+0x64/0xe0 #1: ffff98f6c328e488 (&amp;of -&gt;mutex){+.+.}-{3:3}, en: kernfs_fop_write_iter+0xf8/0x1d0 #2: ffff98ef83b31890 (kn-&gt;active#113){.+.+}-{0:0}, en : kernfs_fop_write_iter+0x100/0x1d0 #3: ffffffffabf9db48 (mf_mutex){+.+.}-{3:3}, en: Memory_failure+0x44/0xc70 #4: ffffffffabf92ea8 (pcp_batch_high_lock){+.+.}-{3: 3}, en: zone_pcp_disable+0x16/0x40 seguimiento de pila: CPU: 10 PID: 46904 Comm: bash Kdump: cargado No contaminado 6.8.0-11409-gf6cef5f8c37f #1 Nombre de hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 01/04/2014 Seguimiento de llamadas:  dump_stack_lvl+0x68/0xa0 check_noncircular+0x129/0x140 __lock_acquire+0x1298/0x1cd0 lock_acquire+0xc0/0x2b0 cpus _read_lock+0x2a /0xc0 static_key_slow_dec+0x16/0x60 __hugetlb_vmemmap_restore_folio+0x1b9/0x200 dissolve_free_huge_page+0x211/0x260 __page_handle_poison+0x45/0xc0 Memory_failure+0x65e/0xc70 hard_offline_page_store+0x55/0 xa0 kernfs_fop_write_iter+0x12c/0x1d0 vfs_write+0x387/0x550 ksys_write+0x64/0xe0 do_syscall_64+0xca /0x1e0 Entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fc862314887 Código: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 &lt;48&gt; 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24 RSP: 002b:00007fff19311268 EFLAGS: 00000246 : 0000000000000001 RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007fc862314887 RDX: 000000000000000c RSI: 000056405645fe10 RDI: 0000000000000001 RBP: 000056405645fe10 R08: 00007fc8623d1460 R09: 000000007ffffff R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c R13: 00007fc86241b780 R14: 00007fc862417600 R15: 00007fc862416a00 En resumen, La siguiente escena rompe el ---truncado---"
    }
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  "lastModified": "2026-06-17T07:18:52.137",
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