Out-of-bounds write in Linux kernel - CVE-2026-93201

Vulnerability identifier: #VU150795

CSH Severity: Low

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-93201

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to perform out-of-bounds reads and writes.

The vulnerability exists due to an out-of-bounds read and write in dm-pcache cache metadata decoders and workers when processing attacker-controlled cache-device metadata. A local privileged user can supply a cache device containing an out-of-range segment identifier during a table load to perform out-of-bounds reads and writes.

The affected metadata is protected only by a CRC with a fixed public seed.

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/90c990a68460d7b5720e5634cf650eccdf0f4098
• https://git.kernel.org/stable/c/b4bf8af5e7d7db4c5e179e15017da55857761ac4

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