SB20260507225 - Improper input validation in Linux kernel integrity ima

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-43129)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper input validation in ima_restore_measurement_list() when restoring the previous kernel's IMA measurement buffer during kexec boot. A local user can boot a second-stage kernel with a limiting command line such as "mem=" to cause a denial of service.

This issue occurs on x86_64 systems during early restore of the measurement list.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/10d1c75ed4382a8e79874379caa2ead8952734f9
• https://git.kernel.org/stable/c/5366ec7d2f793ce703c403d7fd4c25a3db365b9d
• https://git.kernel.org/stable/c/9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa
• https://git.kernel.org/stable/c/f11d7d088f5ed54b31c6735854c12845eb60eb4a