CVE-2026-80561
Estado: RecibidaCrítica (9.8)—
In the Linux kernel, the following vulnerability has been resolved:
libceph: fix multiple unsafe decodes in decode_locker()
decode_locker() in cls_lock_client.c contains three unsafe decode operations that allow a malicious or compromised OSD to trigger slab-out-of-bounds reads:
A new label is added to return -EINVAL on any bounds violation. -EINVAL is appropriate here: the data received from the OSD is structurally malformed, which is an invalid argument to the decode contract regardless of whether the caller or the wire is at fault.
Attacker model: a malicious or compromised OSD in a multi-tenant Ceph deployment can trigger this against any kernel client that issues the lock.get_info class method (e.g. during RBD exclusive lock acquisition) without any further privileges beyond OSD session establishment.
Detalles técnicos trazas, registros y código del informe original
1. ceph_decode_copy() at the locker_id_t name field has no preceding bounds check. With p == end after ceph_start_decoding() accepts struct_len=0, this reads sizeof(ceph_entity_name) = 9 bytes past the validated buffer boundary. 2. *p += sizeof(struct ceph_timespec) after the locker_info_t header is an unchecked pointer advance. A malicious OSD can position p past end, causing all subsequent _safe checks to pass against a bogus boundary. 3. len = ceph_decode_32(p) has no preceding bounds check, and the immediately following *p += len is uncapped. A malicious OSD can send len=0xffffffff, advancing p gigabytes past end and escaping the decode window entirely. Fix all three by replacing bare operations with their safe variants: ceph_decode_copy -> ceph_decode_copy_safe *p += sizeof(...) -> ceph_decode_skip_n ceph_decode_32(p) -> ceph_decode_32_safe *p += len -> ceph_decode_skip_n [ idryomov: use ceph_decode_skip_string() to skip description, trim changelog ]
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: 42
- 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 access60 %
Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/1ed45c8d96498725eb54f740172f9068d8673906
- https://git.kernel.org/stable/c/3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070
- https://git.kernel.org/stable/c/437b6551cfcc235eea1d735a874f9d421f555e17
- https://git.kernel.org/stable/c/51c8d238fe7236de627ab1a1433694552a904136
- https://git.kernel.org/stable/c/6265103e78f0ee7e2518de9cf938b94bee9700a0
- https://git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1
- https://git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a
- https://git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-80561",
"cveTags": [],
"metrics": {
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{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 9.8,
"attackVector": "NETWORK",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
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"published": "2026-08-26T15:17:11.007",
"references": [
{
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}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix multiple unsafe decodes in decode_locker()\n\ndecode_locker() in cls_lock_client.c contains three unsafe decode\noperations that allow a malicious or compromised OSD to trigger\nslab-out-of-bounds reads:\n\n1. ceph_decode_copy() at the locker_id_t name field has no preceding\n bounds check. With p == end after ceph_start_decoding() accepts\n struct_len=0, this reads sizeof(ceph_entity_name) = 9 bytes past\n the validated buffer boundary.\n\n2. *p += sizeof(struct ceph_timespec) after the locker_info_t header\n is an unchecked pointer advance. A malicious OSD can position p\n past end, causing all subsequent _safe checks to pass against a\n bogus boundary.\n\n3. len = ceph_decode_32(p) has no preceding bounds check, and the\n immediately following *p += len is uncapped. A malicious OSD can\n send len=0xffffffff, advancing p gigabytes past end and escaping\n the decode window entirely.\n\nFix all three by replacing bare operations with their safe variants:\n ceph_decode_copy -> ceph_decode_copy_safe\n *p += sizeof(...) -> ceph_decode_skip_n\n ceph_decode_32(p) -> ceph_decode_32_safe\n *p += len -> ceph_decode_skip_n\n\nA new label is added to return -EINVAL on any bounds violation.\n-EINVAL is appropriate here: the data received from the OSD\nis structurally malformed, which is an invalid argument to the decode\ncontract regardless of whether the caller or the wire is at fault.\n\nAttacker model: a malicious or compromised OSD in a multi-tenant Ceph\ndeployment can trigger this against any kernel client that issues the\nlock.get_info class method (e.g. during RBD exclusive lock acquisition)\nwithout any further privileges beyond OSD session establishment.\n\n[ idryomov: use ceph_decode_skip_string() to skip description, trim\n changelog ]"
}
],
"lastModified": "2026-08-27T06:17:41.057",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}