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ReviewCritical

CVE-2026-80561

Linux

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: 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 poi...

CVSS
9.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.27
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.8

Vulnerability overview

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: 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 poi...

Affected product and versions

Product
Linux
Affected versions
>= d4ed4a530562881cc5225050e42d96034f405aae < 1ed45c8d96498725eb54f740172f9068d8673906, >= d4ed4a530562881cc5225050e42d96034f405aae < 6265103e78f0ee7e2518de9cf938b94bee9700a0, >= d4ed4a530562881cc5225050e42d96034f405aae < 3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070, >= d4ed4a530562881cc5225050e42d96034f405aae < fa4aa86fff0c56799c2e3f51a88879053285f4a9, >= d4ed4a530562881cc5225050e42d96034f405aae < dbfd83f722a78446ec18a476ef7a38e52240b50a, >= d4ed4a530562881cc5225050e42d96034f405aae < d1bba38574d095f191557d397d9633f08cd966b1, >= d4ed4a530562881cc5225050e42d96034f405aae < 51c8d238fe7236de627ab1a1433694552a904136, >= d4ed4a530562881cc5225050e42d96034f405aae < 437b6551cfcc235eea1d735a874f9d421f555e17, >= 4.9
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available