SB20260507269 - Improper Initialization in Linux kernel xfrm
Published: May 7, 2026
Security Bulletin ID
SB20260507269
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Initialization (CVE-ID: CVE-2026-43089)
CWE-ID: CWE-665 - Improper Initialization
CVSSv4: 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
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to improper initialization in build_mapping() when copying xfrm_usersa_id structures to userspace. A local user can trigger the affected code path to disclose sensitive information.
The issue is caused by a one-byte padding hole after the proto field that is not cleared before the structure is copied out.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1beb76b2053b68c491b78370794b8ff63c8f8c02
- https://git.kernel.org/stable/c/5a1a4b049ddde41466ccac0daeec326254b133f2
- https://git.kernel.org/stable/c/700c9622b23c33b5933e6dcea816492c064e4e10
- https://git.kernel.org/stable/c/d3125c541a96fb3c0fc7210112684baf22b6c24d
- https://git.kernel.org/stable/c/f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c