SB2026042580 - Information disclosure in Linux kernel kernel cpu

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Main Vulnerability Database SB2026042580

SB2026042580 - Information disclosure in Linux kernel kernel cpu

Published: April 25, 2026

Security Bulletin ID SB2026042580
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Information disclosure (CVE-ID: CVE-2026-31628)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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


The vulnerability allows a local attacker to disclose sensitive information.

The vulnerability exists due to improper isolation of partial divider results in x86 CPU handling when executing division operations on Zen1 processors. A local attacker can run a thread that observes residual partial results from previous operations to disclose sensitive information.

Exploitation requires another thread to access leaked partial results left by a previous operation under certain circumstances.


Remediation

Install update from vendor's website.

References