SB2026092528 - Exposure of Resource to Wrong Sphere in Linux kernel hsr

Description

This security bulletin contains information about 1 vulnerability.

1) Exposure of Resource to Wrong Sphere (CVE-ID: CVE-2026-97419)

CWE-ID: CWE-668 - Exposure of resource to wrong sphere

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to disclose sensitive information.

The vulnerability exists due to improper network namespace isolation in HSR generic netlink notification handling when broadcasting ring error and node down events. A local privileged user can listen for notifications from HSR devices in other network namespaces in init_net to disclose sensitive information.

The notifications expose the peer node MAC address and slave port interface index.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/24b3f1a9982c176d05a523a4bb9314dca0db4488
• https://git.kernel.org/stable/c/25b69f281cebe051a8e4ab19950a939c27ead1bc
• https://git.kernel.org/stable/c/a762fabd7ef9a6cc07258684138f9c3f078d0326