CVE-2024-56718
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net/smc: protect link down work from execute after lgr freed
link down work may be scheduled before lgr freed but execute after lgr freed, which may result in crash. So it is need to hold a reference before shedule link down work, and put the reference after work executed or canceled.
Detalles técnicos trazas, registros y código del informe original
The relevant crash call stack as follows:
list_del corruption. prev->next should be ffffb638c9c0fe20,
but was 0000000000000000
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:51!
invalid opcode: 0000 [#1] SMP NOPTI
CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1
Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014
Workqueue: events smc_link_down_work [smc]
RIP: 0010:__list_del_entry_valid.cold+0x31/0x47
RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086
RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000
RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38
R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002
R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0
FS: 0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
rwsem_down_write_slowpath+0x17e/0x470
smc_link_down_work+0x3c/0x60 [smc]
process_one_work+0x1ac/0x350
worker_thread+0x49/0x2f0
? rescuer_thread+0x360/0x360
kthread+0x118/0x140
? __kthread_bind_mask+0x60/0x60
ret_from_fork+0x1f/0x30CVSS
- 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: 0.47%
- Percentil entre todas las CVEs puntuadas: 38
- Fecha de la puntuación: 6/10/2026
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 (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2
- https://git.kernel.org/stable/c/2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec
- https://git.kernel.org/stable/c/841b1824750d3b8d1dc0a96b14db4418b952abbc
- https://git.kernel.org/stable/c/bec2f52866d511e94c1c37cd962e4382b1b1a299
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect link down work from execute after lgr freed\n\nlink down work may be scheduled before lgr freed but execute\nafter lgr freed, which may result in crash. So it is need to\nhold a reference before shedule link down work, and put the\nreference after work executed or canceled.\n\nThe relevant crash call stack as follows:\n list_del corruption. prev->next should be ffffb638c9c0fe20,\n but was 0000000000000000\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:51!\n invalid opcode: 0000 [#1] SMP NOPTI\n CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1\n Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014\n Workqueue: events smc_link_down_work [smc]\n RIP: 0010:__list_del_entry_valid.cold+0x31/0x47\n RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086\n RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000\n RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80\n RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38\n R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002\n R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0\n FS: 0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n rwsem_down_write_slowpath+0x17e/0x470\n smc_link_down_work+0x3c/0x60 [smc]\n process_one_work+0x1ac/0x350\n worker_thread+0x49/0x2f0\n ? rescuer_thread+0x360/0x360\n kthread+0x118/0x140\n ? __kthread_bind_mask+0x60/0x60\n ret_from_fork+0x1f/0x30"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: proteger el trabajo de enlace caído para que no se ejecute después de que lgr freed el trabajo de enlace caído puede programarse antes de que lgr freed pero ejecutarse después de que lgr freed, lo que puede provocar un bloqueo. Por lo tanto, es necesario mantener una referencia antes de programar el trabajo de enlace caído y colocar la referencia después de que el trabajo se haya ejecutado o cancelado. La pila de llamadas de bloqueo relevante es la siguiente: corrupción de list_del. prev->next debería ser ffffb638c9c0fe20, pero era 0000000000000000 ------------[ cortar aquí ]------------ ¡ERROR del kernel en lib/list_debug.c:51! código de operación no válido: 0000 [#1] SMP NOPTI CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: cargado Contaminado: G #1 Nombre del hardware: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014 Cola de trabajo: eventos smc_link_down_work [smc] RIP: 0010:__list_del_entry_valid.cold+0x31/0x47 RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086 RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 000000000000000 RDX: RSI: ffff94352091fc80 RDI: ffff94352091fc80 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38 R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002 R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0 FS: 0000000000000000(0000) GS:ffff943520900000(0000) knlGS:00000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000000000000400 PKRU: 55555554 Seguimiento de llamadas: rwsem_down_write_slowpath+0x17e/0x470 smc_link_down_work+0x3c/0x60 [smc] process_one_work+0x1ac/0x350 subproceso de trabajo+0x49/0x2f0 ? subproceso de rescate+0x360/0x360 kthread+0x118/0x140 ? __kthread_bind_mask+0x60/0x60 ret_from_fork+0x1f/0x30"
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"lastModified": "2026-08-04T11:22:24.247",
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