Out-of-bounds read in Linux kernel - CVE-2026-80561
Published: August 27, 2026
Vulnerability identifier: #VU145930
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80561
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.
The vulnerability exists due to out-of-bounds read in decode_locker() in net/ceph/cls_lock_client.c when decoding locker data from an OSD response. A remote attacker can send a specially crafted OSD response to disclose sensitive information and cause a denial of service.
Exploitation requires a malicious or compromised OSD to interact with a kernel client issuing the lock.get_info class method, such as during RBD exclusive lock acquisition.
Affected software
Linux kernel
How to mitigate CVE-2026-80561
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External 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
- https://git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1
- https://git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a
- https://git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9