Out-of-bounds read in Linux kernel - CVE-2026-45999
Published: May 28, 2026
Vulnerability identifier: #VU132491
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-45999
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-45999
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab
- https://git.kernel.org/stable/c/43a878639b90e9721ffa5eb616a7e6d8454adef3
- https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e
- https://git.kernel.org/stable/c/c9ce18e6bb2c467ec85756dc7989b547b7584fee
- https://git.kernel.org/stable/c/f1374fa6e57fd836623668d782ded9244cfd2938