CVE-2024-53174
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: make sure cache entry active before cache_show
The function `c_show` was called with protection from RCU. This only ensures that `cp` will not be freed. Therefore, the reference count for `cp` can drop to zero, which will trigger a refcount use-after-free warning when `cache_get` is called. To resolve this issue, use `cache_get_rcu` to ensure that `cp` remains active.
Detalles técnicos trazas, registros y código del informe original
------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 7 PID: 822 at lib/refcount.c:25 refcount_warn_saturate+0xb1/0x120 CPU: 7 UID: 0 PID: 822 Comm: cat Not tainted 6.12.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb1/0x120 Call Trace: <TASK> c_show+0x2fc/0x380 [sunrpc] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 proc_reg_read+0xe1/0x140 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.26%
- Percentil entre todas las CVEs puntuadas: 16
- 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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1499.004Application or System Exploitationimpact75 %
Vulnerabilidad de escalada local (AV:L, PR:L) que causa use-after-free en el kernel SUNRPC, permitiendo DoS (refcount warning). CWE-416 confirma acceso a memoria liberada; el contexto de lectura de /proc sugiere denegación de servicio.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-416
Referencias
- https://git.kernel.org/stable/c/02999e135b013d85c6df738746e8e24699befee4
- https://git.kernel.org/stable/c/068c0b50f3f700b94f78850834cd91ae3b34c2c1
- https://git.kernel.org/stable/c/2862eee078a4d2d1f584e7f24fa50dddfa5f3471
- https://git.kernel.org/stable/c/acfaf37888e0f0732fb6a50ff093dce6d99994d0
- https://git.kernel.org/stable/c/c7dac3af57e38b2054f990e573256d90bf887958
- https://git.kernel.org/stable/c/d882e2b7fad3f5e5fac66184a347f408813f654a
- https://git.kernel.org/stable/c/e9be26735d055c42543a4d047a769cc6d0fb1504
- https://git.kernel.org/stable/c/ec305f303bf070b4f6896b7a76009f702956d402
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: make sure cache entry active before cache_show\n\nThe function `c_show` was called with protection from RCU. This only\nensures that `cp` will not be freed. Therefore, the reference count for\n`cp` can drop to zero, which will trigger a refcount use-after-free\nwarning when `cache_get` is called. To resolve this issue, use\n`cache_get_rcu` to ensure that `cp` remains active.\n\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 7 PID: 822 at lib/refcount.c:25\nrefcount_warn_saturate+0xb1/0x120\nCPU: 7 UID: 0 PID: 822 Comm: cat Not tainted 6.12.0-rc3+ #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nRIP: 0010:refcount_warn_saturate+0xb1/0x120\n\nCall Trace:\n <TASK>\n c_show+0x2fc/0x380 [sunrpc]\n seq_read_iter+0x589/0x770\n seq_read+0x1e5/0x270\n proc_reg_read+0xe1/0x140\n vfs_read+0x125/0x530\n ksys_read+0xc1/0x160\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: SUNRPC: asegúrese de que la entrada de caché esté activa antes de cache_show La función `c_show` se llamó con protección de RCU. Esto solo garantiza que `cp` no se liberará. Por lo tanto, el recuento de referencia para `cp` puede caer a cero, lo que activará una advertencia de use-after-free de refcount cuando se llame a `cache_get`. Para resolver este problema, use `cache_get_rcu` para asegurarse de que `cp` permanezca activo. ------------[ cortar aquí ]------------ refcount_t: adición en 0; use-after-free. ADVERTENCIA: CPU: 7 PID: 822 en lib/refcount.c:25 refcount_warn_saturate+0xb1/0x120 CPU: 7 UID: 0 PID: 822 Comm: cat No contaminado 6.12.0-rc3+ #1 Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 01/04/2014 RIP: 0010:refcount_warn_saturate+0xb1/0x120 Seguimiento de llamadas: c_show+0x2fc/0x380 [sunrpc] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 proc_reg_read+0xe1/0x140 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 hacer_syscall_64+0x5f/0x170 entrada_SYSCALL_64_después_hwframe+0x76/0x7e"
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