CVE-2026-52955
Estado: AnalizadaCrítica (9.8)—
In the Linux kernel, the following vulnerability has been resolved:
libceph: Fix potential out-of-bounds access in crush_decode()
A message of type CEPH_MSG_OSD_MAP containing a crush map with at least one bucket has two fields holding the bucket algorithm. If the values in these two fields differ, an out-of-bounds access can occur. This is the case because the first algorithm field (alg) is used to allocate the correct amount of memory for a bucket of this type, while the second algorithm field inside the bucket (b->alg) is used in the subsequent processing.
This patch fixes the issue by adding a check that compares alg and b->alg and aborts the processing in case they differ.
Leer descripción completaMostrar menos
Furthermore, b->alg is set to 0 in this case, because the destruction of the crush map also uses this field to determine the bucket type, which can again result in an out-of-bounds access when trying to free the memory pointed to by the fields of the bucket. To correctly free the memory allocated for the bucket in such a case, the corresponding call to kfree is moved from the algorithm-specific crush_destroy_bucket functions to the generic crush_destroy_bucket().
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 9.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.51%
- Percentil entre todas las CVEs puntuadas: 41
- 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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 % - Impacto secundario
T1499.004Application or System Exploitationimpact60 %
Vulnerabilidad remota en Linux kernel (AV:N, PR:N, UI:N) explotable sin privilegios. Out-of-bounds en crush_decode() permite ejecución de código o DoS en el kernel (CWE-125, CWE-131).
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-125
- CWE-131
Referencias
- https://git.kernel.org/stable/c/0f3604cbe4df14c5e58288ac9f57511e726a222d
- https://git.kernel.org/stable/c/3f42508191e129ee6b5ea96578d5cab14f2a013a
- https://git.kernel.org/stable/c/4c79fc2d598694bda845b46229c9d48b65042970
- https://git.kernel.org/stable/c/6e70ef53e818c53eab28d7b0026b7fd03dddaba5
- https://git.kernel.org/stable/c/cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5
- https://git.kernel.org/stable/c/ea0d42137f0c06da71e37ffc647aab4c5309599a
- https://git.kernel.org/stable/c/ebe76d58a48a48031b98543d86c4cd30a825b622
- https://git.kernel.org/stable/c/fb176a99e4c1a5a8448a83d83d3606203ba81faa
- https://access.redhat.com/security/cve/CVE-2026-52955
- https://bugzilla.redhat.com/show_bug.cgi?id=2492328
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52955.json
JSON original (NVD)
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