Out-of-bounds read in Linux kernel - CVE-2026-80961

Vulnerability identifier: #VU149442

CSH Severity: Low

CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-80961

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in dm-pcache cache_key_decode() when decoding cache keys from supplied cache-device metadata. A local privileged user can provide key metadata whose intra-segment offset and length extend beyond the segment boundary to disclose sensitive information.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/5ac38f4b4862fad6e7270fde5c3356a822ce74ca
• https://git.kernel.org/stable/c/d8caf96040a06096276ab72f5e1e8547c014c564
• https://git.kernel.org/stable/c/f11deb032fd84081e7831cffcba895d893054a22

• Out-of-bounds read in Linux kernel md dm-pcache driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more