Use of uninitialized resource in Linux kernel - CVE-2026-46315
Published: June 10, 2026
Vulnerability identifier: #VU134185
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-2026-46315
CWE-ID: CWE-908
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 uninitialized memory usage in io_uring IORING_OP_WAITID result handling when copying waitid result data to userspace. A local user can trigger a wait operation that completes without reporting a child event to disclose sensitive information.
The issue occurs because stale bytes from reused io_kiocb command storage may be copied to userspace siginfo when no child event information is written.
How to mitigate CVE-2026-46315
Install security update from vendor's repository.