{"cve":"CVE-2026-80561","nvd":{"published":"2026-08-26T15:17:11.007","modified":"2026-10-16T20:18:00.360","status":"Received","description":"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 ]","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:17.453294893+00:00"},"epss":{"cve":"CVE-2026-80561","score":0.00514,"percentile":0.4352,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}