SB2026052878 - Out-of-bounds read in Linux kernel erofs

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Main Vulnerability Database SB2026052878

SB2026052878 - Out-of-bounds read in Linux kernel erofs

Published: May 28, 2026

Security Bulletin ID SB2026052878
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) Out-of-bounds read (CVE-ID: CVE-2026-45999)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/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 user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in z_erofs_lz4_handle_overlap() when processing a crafted EROFS image during LZ4 inplace decompression. A local user can mount a crafted image and trigger decompression to disclose sensitive information.

The issue occurs for illegal extents where partial decoding is disabled and m_llen is smaller than m_plen, causing an unsigned underflow in the outpages minus inpages calculation.


Remediation

Install update from vendor's website.

References