CVE-2025-39736
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock
When netpoll is enabled, calling pr_warn_once() while holding kmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock inversion with the netconsole subsystem. This occurs because pr_warn_once() may trigger netpoll, which eventually leads to __alloc_skb() and back into kmemleak code, attempting to reacquire kmemleak_lock.
This is the path for the deadlock.
Fix this by setting a flag and issuing the pr_warn_once() after kmemleak_lock is released.
Detalles técnicos trazas, registros y código del informe original
mem_pool_alloc()
-> raw_spin_lock_irqsave(&kmemleak_lock, flags);
-> pr_warn_once()
-> netconsole subsystem
-> netpoll
-> __alloc_skb
-> __create_object
-> raw_spin_lock_irqsave(&kmemleak_lock, flags);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: 0.13%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 5/10/2026
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)
CWE
- CWE-667
Referencias
- https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b
- https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d
- https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2
- https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334
- https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac
- https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350
- https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f
- https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a
- https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock\n\nWhen netpoll is enabled, calling pr_warn_once() while holding\nkmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock\ninversion with the netconsole subsystem. This occurs because\npr_warn_once() may trigger netpoll, which eventually leads to\n__alloc_skb() and back into kmemleak code, attempting to reacquire\nkmemleak_lock.\n\nThis is the path for the deadlock.\n\nmem_pool_alloc()\n -> raw_spin_lock_irqsave(&kmemleak_lock, flags);\n -> pr_warn_once()\n -> netconsole subsystem\n\t -> netpoll\n\t -> __alloc_skb\n\t\t -> __create_object\n\t\t -> raw_spin_lock_irqsave(&kmemleak_lock, flags);\n\nFix this by setting a flag and issuing the pr_warn_once() after\nkmemleak_lock is released."
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