SB20260507174 - Integer underflow in Linux kernel firmware efi driver

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Main Vulnerability Database SB20260507174

SB20260507174 - Integer underflow in Linux kernel firmware efi driver

Published: May 7, 2026

Security Bulletin ID SB20260507174
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) Integer underflow (CVE-ID: CVE-2026-43171)

CWE-ID: CWE-191 - Integer underflow

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


The vulnerability allows a local user to disclose sensitive information, cause a denial of service, or trigger a kernel oops.

The vulnerability exists due to an integer underflow in cper_print_fw_err() when processing a malformed firmware error record with an offset beyond the actual record length. A local user can provide a crafted error record to disclose sensitive information, cause a denial of service, or trigger a kernel oops.

The issue occurs on systems with bad or malformed firmware error records.


Remediation

Install update from vendor's website.

References