SB20261022222 - Incorrect Bitwise Shift of Integer in Linux kernel squashfs

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Main Vulnerability Database SB20261022222

SB20261022222 - Incorrect Bitwise Shift of Integer in Linux kernel squashfs

Published: October 22, 2026

Security Bulletin ID SB20261022222
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) Incorrect Bitwise Shift of Integer (CVE-ID: CVE-2026-98636)

CWE-ID: CWE-1335 - Incorrect Bitwise Shift of Integer

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to trigger undefined kernel behavior that may cause a denial of service.

The vulnerability exists due to an incorrect bitwise shift in the squashfs_xz_comp_opts() function when processing a SquashFS image with the COMP_OPTS flag set to 1 and a dictionary size of zero. A local privileged user can cause a specially crafted image to be mounted to trigger a shift with an exponent of -1, resulting in undefined behavior that may cause a denial of service.


Remediation

Install update from vendor's website.

References