Use of Uninitialized Variable in Linux kernel - CVE-2026-52937
Published: June 25, 2026
Vulnerability identifier: #VU135448
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-52937
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 an information leak from uninitialized stack memory in tap_ioctl() when handling the SIOCGIFHWADDR ioctl request. A local user can issue a crafted ioctl request to disclose sensitive information.
The leaked data may include kernel .text and direct-map pointers, which can defeat KASLR.
How to mitigate CVE-2026-52937
Install security update from vendor's repository.