CVE-2024-56665
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
bpf,perf: Fix invalid prog_array access in perf_event_detach_bpf_prog
Syzbot reported [1] crash that happens for following tracing scenario:
The fix makes sure the perf_event_detach_bpf_prog checks prog_array is valid before it tries to remove the bpf program from it.
[1] https://lore.kernel.org/bpf/Z1MR6dCIKajNS6nU@krava/T/#m91dbf0688221ec7a7fc95e896a7ef9ff93b0b8ad
Detalles técnicos trazas, registros y código del informe original
- create tracepoint perf event with attr.inherit=1, attach it to the
process and set bpf program to it
- attached process forks -> chid creates inherited event
the new child event shares the parent's bpf program and tp_event
(hence prog_array) which is global for tracepoint
- exit both process and its child -> release both events
- first perf_event_detach_bpf_prog call will release tp_event->prog_array
and second perf_event_detach_bpf_prog will crash, because
tp_event->prog_array is NULLCVSS
- 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: 0.22%
- Percentil entre todas las CVEs puntuadas: 12
- 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/842e5af282453983586e2eae3c8eaf252de5f22f
- https://git.kernel.org/stable/c/978c4486cca5c7b9253d3ab98a88c8e769cb9bbd
- https://git.kernel.org/stable/c/c2b6b47662d5f2dfce92e5ffbdcac8229f321d9d
- https://git.kernel.org/stable/c/dfb15ddf3b65e0df2129f9756d1b4fa78055cdb3
- 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\nbpf,perf: Fix invalid prog_array access in perf_event_detach_bpf_prog\n\nSyzbot reported [1] crash that happens for following tracing scenario:\n\n - create tracepoint perf event with attr.inherit=1, attach it to the\n process and set bpf program to it\n - attached process forks -> chid creates inherited event\n\n the new child event shares the parent's bpf program and tp_event\n (hence prog_array) which is global for tracepoint\n\n - exit both process and its child -> release both events\n - first perf_event_detach_bpf_prog call will release tp_event->prog_array\n and second perf_event_detach_bpf_prog will crash, because\n tp_event->prog_array is NULL\n\nThe fix makes sure the perf_event_detach_bpf_prog checks prog_array\nis valid before it tries to remove the bpf program from it.\n\n[1] https://lore.kernel.org/bpf/Z1MR6dCIKajNS6nU@krava/T/#m91dbf0688221ec7a7fc95e896a7ef9ff93b0b8ad"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf,perf: Se corrige el acceso no válido a prog_array en perf_event_detach_bpf_prog Syzbot informó [1] un fallo que ocurre en el siguiente escenario de seguimiento: - crear un evento perf de tracepoint con attr.inherit=1, adjuntarlo al proceso y establecerle el programa bpf - el proceso adjunto se bifurca -> chid crea un evento heredado el nuevo evento secundario comparte el programa bpf del padre y tp_event (de ahí prog_array) que es global para tracepoint - salir tanto del proceso como de su hijo -> liberar ambos eventos - la primera llamada perf_event_detach_bpf_prog liberará tp_event->prog_array y la segunda perf_event_detach_bpf_prog se bloqueará, porque tp_event->prog_array es NULL La corrección asegura que las comprobaciones perf_event_detach_bpf_prog prog_array es válido antes de intentar eliminar el programa bpf de él. [1] https://lore.kernel.org/bpf/Z1MR6dCIKajNS6nU@krava/T/#m91dbf0688221ec7a7fc95e896a7ef9ff93b0b8ad"
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