Out-of-bounds read in Linux kernel - CVE-2026-46078
Published: May 27, 2026
Vulnerability identifier: #VU132406
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-2026-46078
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 the EROFS directory entry handling code when parsing a crafted EROFS image with a trailing directory entry containing an invalid name offset. A local user can provide a specially crafted EROFS image to disclose sensitive information.
The issue occurs because an unchecked name offset can cause an underflow in the length calculation used by strnlen(), leading to a read past the directory block.
How to mitigate CVE-2026-46078
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1d55445226c75ddd4e78b09b3e7d99109b28c366
- https://git.kernel.org/stable/c/222055e6b4063abd2d9e13c3d49bbd1724c50789
- https://git.kernel.org/stable/c/48b27a955d22391c7f30169fa7b6b2e1977f1ce4
- https://git.kernel.org/stable/c/8ebb951a284b7446e025afc7dc5e9516ef9a7214
- https://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575