Heap-based buffer overflow in Linux kernel - CVE-2026-31694
Published: May 2, 2026
Vulnerability identifier: #VU128995
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-31694
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in fuse_add_dirent_to_cache() when processing directory entries returned by a FUSE server. A remote attacker can return a specially crafted directory entry with an oversized name length to cause a denial of service.
The issue occurs when a serialized directory entry exceeds a single page size and is copied into the readdir cache.
How to mitigate CVE-2026-31694
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/45c05af36311624c1148123caeb011312495d86b
- https://git.kernel.org/stable/c/474ce83c96a55f2eeb14dee2be375eeadfdacdf5
- https://git.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bed
- https://git.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f
- https://git.kernel.org/stable/c/d23ad78bfd205eac26766e38ba7d79f279131098