SB2026050797 - Improper input validation in Linux kernel x86 kernel

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Main Vulnerability Database SB2026050797

SB2026050797 - Improper input validation in Linux kernel x86 kernel

Published: May 7, 2026

Security Bulletin ID SB2026050797
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-43240)

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 the ima_restore_measurement_list function when booting a second-stage kernel via kexec with a limiting command line such as "mem=". A local user can boot the second-stage kernel with a crafted limiting command line to cause a denial of service.

The issue occurs when the physical range containing the carried-over IMA measurement list falls outside truncated RAM, leading to a kernel panic.


Remediation

Install update from vendor's website.

References