CVE-2024-57917
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
topology: Keep the cpumask unchanged when printing cpumap
During fuzz testing, the following warning was discovered:
different return values (15 and 11) from vsnprintf("%*pbl ", ...)
The call trace shows that kvasprintf() reported this warning during the printing of core_siblings_list. kvasprintf() has several steps:
(1) First, calculate the length of the resulting formatted string.
(2) Allocate a buffer based on the returned length.
(3) Then, perform the actual string formatting.
If the core_cpumask is modified between steps (1) and (3), the lengths obtained in these two steps may not match. Indeed our test includes cpu hotplugging, which should modify core_cpumask while printing.
Leer descripción completaMostrar menos
To fix this issue, cache the cpumask into a temporary variable before calling cpumap_print_{list, cpumask}_to_buf(), to keep it unchanged during the printing process.
Detalles técnicos trazas, registros y código del informe original
test:keyward is WARNING in kvasprintf
WARNING: CPU: 55 PID: 1168477 at lib/kasprintf.c:30 kvasprintf+0x121/0x130
Call Trace:
kvasprintf+0x121/0x130
kasprintf+0xa6/0xe0
bitmap_print_to_buf+0x89/0x100
core_siblings_list_read+0x7e/0xb0
kernfs_file_read_iter+0x15b/0x270
new_sync_read+0x153/0x260
vfs_read+0x215/0x290
ksys_read+0xb9/0x160
do_syscall_64+0x56/0x100
entry_SYSCALL_64_after_hwframe+0x78/0xe2
(4) Check whether the lengths of the formatted strings returned in
steps (1) and (2) are consistent.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: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- 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 escalation75 % - Impacto principal
T1499.004Application or System Exploitationimpact65 %
Vulnerabilidad local (AV:L/PR:L) en kernel Linux que permite DoS mediante race condition en cpu hotplugging. La modificación de cpumask durante operaciones de lectura causa inconsistencias y warnings que pueden causar indisponibilidad del sistema.
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
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/1c7818e2746e747838a3de1687e89eac7b947f08
- https://git.kernel.org/stable/c/360596e7fe319a5db1b5fb34a3952862ae53c924
- https://git.kernel.org/stable/c/b02cf1d27e460ab2b3e1c8c9ce472d562cad2e8d
- https://git.kernel.org/stable/c/ca47e933a900492d89dcf5db18a99c28bd4a742d
- https://git.kernel.org/stable/c/cbd399f78e23ad4492c174fc5e6b3676dba74a52
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntopology: Keep the cpumask unchanged when printing cpumap\n\nDuring fuzz testing, the following warning was discovered:\n\n different return values (15 and 11) from vsnprintf(\"%*pbl\n \", ...)\n\n test:keyward is WARNING in kvasprintf\n WARNING: CPU: 55 PID: 1168477 at lib/kasprintf.c:30 kvasprintf+0x121/0x130\n Call Trace:\n kvasprintf+0x121/0x130\n kasprintf+0xa6/0xe0\n bitmap_print_to_buf+0x89/0x100\n core_siblings_list_read+0x7e/0xb0\n kernfs_file_read_iter+0x15b/0x270\n new_sync_read+0x153/0x260\n vfs_read+0x215/0x290\n ksys_read+0xb9/0x160\n do_syscall_64+0x56/0x100\n entry_SYSCALL_64_after_hwframe+0x78/0xe2\n\nThe call trace shows that kvasprintf() reported this warning during the\nprinting of core_siblings_list. kvasprintf() has several steps:\n\n (1) First, calculate the length of the resulting formatted string.\n\n (2) Allocate a buffer based on the returned length.\n\n (3) Then, perform the actual string formatting.\n\n (4) Check whether the lengths of the formatted strings returned in\n steps (1) and (2) are consistent.\n\nIf the core_cpumask is modified between steps (1) and (3), the lengths\nobtained in these two steps may not match. Indeed our test includes cpu\nhotplugging, which should modify core_cpumask while printing.\n\nTo fix this issue, cache the cpumask into a temporary variable before\ncalling cpumap_print_{list, cpumask}_to_buf(), to keep it unchanged\nduring the printing process."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: topología: mantener la cpumask sin cambios al imprimir cpumap Durante las pruebas fuzz, se descubrió la siguiente advertencia: diferentes valores de retorno (15 y 11) de vsnprintf(\"%*pbl \", ...) test:keyward es WARNING en kvasprintf WARNING: CPU: 55 PID: 1168477 en lib/kasprintf.c:30 kvasprintf+0x121/0x130 Seguimiento de llamadas: kvasprintf+0x121/0x130 kasprintf+0xa6/0xe0 bitmap_print_to_buf+0x89/0x100 core_siblings_list_read+0x7e/0xb0 kernfs_file_read_iter+0x15b/0x270 new_sync_read+0x153/0x260 vfs_read+0x215/0x290 ksys_read+0xb9/0x160 do_syscall_64+0x56/0x100 entry_SYSCALL_64_after_hwframe+0x78/0xe2 El seguimiento de la llamada muestra que kvasprintf() informó esta advertencia durante la impresión de core_siblings_list. kvasprintf() tiene varios pasos: (1) Primero, calcule la longitud de la cadena formateada resultante. (2) Asignar un búfer en función de la longitud devuelta. (3) Luego, realice el formateo de la cadena real. (4) Verifique si las longitudes de las cadenas formateadas devueltas en los pasos (1) y (2) son consistentes. Si se modifica core_cpumask entre los pasos (1) y (3), las longitudes obtenidas en estos dos pasos pueden no coincidir. De hecho, nuestra prueba incluye la conexión en caliente de la CPU, que debería modificar core_cpumask durante la impresión. Para solucionar este problema, almacene en caché cpumask en una variable temporal antes de llamar a cpumap_print_{list, cpumask}_to_buf(), para mantenerla sin cambios durante el proceso de impresión."
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"lastModified": "2026-07-14T13:17:13.920",
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