Use of Uninitialized Variable in Linux kernel - CVE-2026-46132
Published: May 29, 2026
Vulnerability identifier: #VU133067
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-2026-46132
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 attacker to disclose sensitive information.
The vulnerability exists due to uninitialized stack memory in rtnl_fill_vfinfo when handling RTM_GETLINK requests with an IFLA_EXT_MASK attribute carrying RTEXT_FILTER_VF. A local attacker can send a crafted netlink request to disclose sensitive information.
The issue can leak up to 26 bytes of uninitialized kernel stack per virtual function per request to userspace.
How to mitigate CVE-2026-46132
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0653c0516234c8258975d268a749115fc0f0ff00
- https://git.kernel.org/stable/c/38bcc21f52246badb3154b6158dcb381d98de011
- https://git.kernel.org/stable/c/4b9e327991815e128ad3af75c3a04630a63ce3e0
- https://git.kernel.org/stable/c/c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8
- https://git.kernel.org/stable/c/fbe0e6197225e6a83cf113a67a4b425f8de0bcd5