Expected behavior violation in Linux kernel - CVE-2026-98067
Published: September 28, 2026
Vulnerability identifier: #VU152407
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98067
CWE-ID: CWE-440
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause data corruption.
The vulnerability exists due to an incorrect assumption about LZ4 literal copy direction in EROFS LZ4 rolling decompression when processing LZ4-compressed extents. A local user can trigger decompression of an LZ4-compressed extent to cause data corruption.
The issue can occur on x86 because the upstream LZ4 literal-copy memmove() may copy non-overlapping long literals backward.
Affected software
Linux kernel
How to mitigate CVE-2026-98067
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3