CVE-2025-38424
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
perf: Fix sample vs do_exit()
Baisheng Gao reported an ARM64 crash, which Mark decoded as being a synchronous external abort -- most likely due to trying to access MMIO in bad ways.
The crash further shows perf trying to do a user stack sample while in exit_mmap()'s tlb_finish_mmu() -- i.e. while tearing down the address space it is trying to access.
It turns out that we stop perf after we tear down the userspace mm; a receipie for disaster, since perf likes to access userspace for various reasons.
Flip this order by moving up where we stop perf in do_exit().
Leer descripción completaMostrar menos
Additionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER to abort when the current task does not have an mm (exit_mm() makes sure to set current->mm = NULL; before commencing with the actual teardown). Such that CPU wide events don't trip on this same problem.
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: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- 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
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b
- https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54
- https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39
- https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386
- https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db
- https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e
- https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964
- https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix sample vs do_exit()\n\nBaisheng Gao reported an ARM64 crash, which Mark decoded as being a\nsynchronous external abort -- most likely due to trying to access\nMMIO in bad ways.\n\nThe crash further shows perf trying to do a user stack sample while in\nexit_mmap()'s tlb_finish_mmu() -- i.e. while tearing down the address\nspace it is trying to access.\n\nIt turns out that we stop perf after we tear down the userspace mm; a\nreceipie for disaster, since perf likes to access userspace for\nvarious reasons.\n\nFlip this order by moving up where we stop perf in do_exit().\n\nAdditionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER\nto abort when the current task does not have an mm (exit_mm() makes\nsure to set current->mm = NULL; before commencing with the actual\nteardown). Such that CPU wide events don't trip on this same problem."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: perf: Fix sample vs do_exit() Baisheng Gao informó de un fallo de ARM64, que Mark decodificó como una interrupción externa sincrónica, probablemente debido a un intento de acceder a MMIO de forma incorrecta. El fallo muestra además que perf intenta hacer una muestra de pila de usuario mientras está en tlb_finish_mmu() de exit_mmap(), es decir, mientras derriba el espacio de direcciones al que intenta acceder. Resulta que detenemos perf después de derribar el mm del espacio de usuario; una receta para el desastre, ya que a perf le gusta acceder al espacio de usuario por varias razones. Invierta este orden subiendo donde detenemos perf en do_exit(). Además, endurezca PERF_SAMPLE_CALLCHAIN y PERF_SAMPLE_STACK_USER para que se detengan cuando la tarea actual no tenga un mm (exit_mm() se asegura de establecer current->mm = NULL; antes de comenzar con el desmontaje real). De modo que los eventos de toda la CPU no se activen con este mismo problema."
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