Race condition in Linux kernel - CVE-2026-64031
Published: July 20, 2026
Vulnerability identifier: #VU138609
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64031
CWE-ID: CWE-362
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 cause a denial of service.
The vulnerability exists due to a race condition in the erofs managed cache handling in z_erofs_fill_bio_vec() and z_erofs_bind_cache() when processing unaligned compressed extents from a crafted image. A local user can provide a crafted image to trigger duplicate managed folio additions and cause a denial of service.
This only impacts unaligned data compression, such as with the -E48bit feature and zstd compression.
How to mitigate CVE-2026-64031
Install security update from vendor's repository.