libceph: fix multiple unsafe decodes in decode_locker()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80561
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-26 15:17:11 UTC
Updated2026-08-27 06:17:41 UTC
DescriptionIn 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: 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 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. [ idryomov: use ceph_decode_skip_string() to skip description, trim changelog ]

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d4ed4a530562881cc5225050e42d96034f405aae 1ed45c8d96498725eb54f740172f9068d8673906 git Not specified
CNA Linux Linux affected d4ed4a530562881cc5225050e42d96034f405aae 6265103e78f0ee7e2518de9cf938b94bee9700a0 git Not specified
CNA Linux Linux affected d4ed4a530562881cc5225050e42d96034f405aae 3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070 git Not specified
CNA Linux Linux affected d4ed4a530562881cc5225050e42d96034f405aae fa4aa86fff0c56799c2e3f51a88879053285f4a9 git Not specified
CNA Linux Linux affected d4ed4a530562881cc5225050e42d96034f405aae dbfd83f722a78446ec18a476ef7a38e52240b50a git Not specified
CNA Linux Linux affected d4ed4a530562881cc5225050e42d96034f405aae d1bba38574d095f191557d397d9633f08cd966b1 git Not specified
CNA Linux Linux affected d4ed4a530562881cc5225050e42d96034f405aae 51c8d238fe7236de627ab1a1433694552a904136 git Not specified
CNA Linux Linux affected d4ed4a530562881cc5225050e42d96034f405aae 437b6551cfcc235eea1d735a874f9d421f555e17 git Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 5.10.266 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.217 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.184 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.153 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.105 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.46 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.10 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/51c8d238fe7236de627ab1a1433694552a904136 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1ed45c8d96498725eb54f740172f9068d8673906 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6265103e78f0ee7e2518de9cf938b94bee9700a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/437b6551cfcc235eea1d735a874f9d421f555e17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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