SB2026050231 - Use of Uninitialized Variable in Linux kernel netfilter

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Main Vulnerability Database SB2026050231

SB2026050231 - Use of Uninitialized Variable in Linux kernel netfilter

Published: May 2, 2026

Security Bulletin ID SB2026050231
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use of Uninitialized Variable (CVE-ID: CVE-2026-43026)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 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


The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to use of uninitialized memory in ctnetlink expectation handling when processing a netlink message without CTA_EXPECT_NAT. A remote user can send a specially crafted netlink message to disclose sensitive information.

The issue can cause stale data from a previous slab allocation to be exposed in a dumped CTA_EXPECT_NAT attribute, and it is relevant only when NAT support is enabled.


Remediation

Install update from vendor's website.

References