Use of Uninitialized Variable in Linux kernel - CVE-2026-46182
Published: May 29, 2026
Vulnerability identifier: #VU133018
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-2026-46182
CWE-ID: CWE-457
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 stack memory in papr_hvpipe when copying a header structure to userspace. A local user can trigger the affected operation to disclose sensitive information.
The issue is caused by uninitialized padding bytes in the structure being exposed through copy_to_user().
How to mitigate CVE-2026-46182
Install security update from vendor's repository.