SB20260507268 - Use of uninitialized resource in Linux kernel key

Description

This security bulletin contains information about 1 vulnerability.

1) Use of uninitialized resource (CVE-ID: CVE-2026-43088)

CWE-ID: CWE-908 - Use of Uninitialized Resource

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 an information exposure caused by uninitialized memory in PF_KEY export paths when exporting aligned sockaddr payloads for certain PF_KEY messages. A local user can trigger affected PF_KEY message handling to disclose sensitive information.

The issue affects the SADB_ACQUIRE, SADB_X_NAT_T_NEW_MAPPING, and SADB_X_MIGRATE export paths, while state and policy dump builders are not affected.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2e74f974359b5382ecbe8536abbb5b837eb6c724
• https://git.kernel.org/stable/c/426c355742f02cf743b347d9d7dbdc1bfbfa31ef