Out-of-bounds read in Linux kernel - CVE-2026-43442
Published: May 8, 2026
Vulnerability identifier: #VU130741
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-2026-43442
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 io_uring_cmd_sqe_copy() when processing 128-byte SQE operations with IORING_SETUP_SQE_MIXED enabled and sq_array present. A local user can remap a logical submission queue position to the last physical SQE slot via sq_array to disclose sensitive information.
The issue occurs because the boundary check validated the logical SQ head position instead of the physical SQE index.
How to mitigate CVE-2026-43442
Install security update from vendor's repository.