SB20260727124 - Use of Uninitialized Variable in Linux kernel key

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Main Vulnerability Database SB20260727124

SB20260727124 - Use of Uninitialized Variable in Linux kernel key

Published: July 27, 2026

Security Bulletin ID SB20260727124
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

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-2026-64436)

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

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use of uninitialized memory in pfkey_msg2xfrm_state() when processing a PF_KEY IPComp state and migrating it. A local user can add a crafted IPComp security association via PF_KEY and trigger migration to cause a denial of service.

The issue affects the PF_KEY path for IPComp states; the XFRM netlink path is not affected.


Remediation

Install update from vendor's website.

References