Unchecked Return Value in Linux kernel - CVE-2026-98387

Vulnerability identifier: #VU155931

CSH Severity: Low

CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98387

CWE-ID: CWE-252

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause access to uninitialized memory.

The vulnerability exists due to unchecked return values in the Linux kernel's s390 AES processing routines when initializing or advancing a scatter-gather cipher walk. A local user can trigger affected AES operations following a walk failure to cause access to uninitialized memory.

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 kernel - update to 7.0 rc3
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/15fa028589c3a2545f0bff355eff06d5844196bf
• https://git.kernel.org/stable/c/35c3f97569306050e818fa18e17fa97c358f0f28
• https://git.kernel.org/stable/c/89b58645646d1dac34162cc2597f42266bfbf930
• https://git.kernel.org/stable/c/aea3e1588f08e381a7a57b2bf1a60cc2347904cd

• Unchecked Return Value in Linux kernel s390 crypto
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more