SB20260919109 - Race condition in Linux kernel bridge

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-90106)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause incorrect ARP or neighbor discovery proxy responses.

The vulnerability exists due to a race condition in the Linux bridge ARP and neighbor discovery proxy handling when processing proxy requests while a neighbor entry is being updated. A remote attacker can send ARP or neighbor discovery requests during a concurrent neighbor update to cause incorrect ARP or neighbor discovery proxy responses.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/291c9e137b7c74e8a512cded4845352da4c4adda
• https://git.kernel.org/stable/c/57549ab9079122991dfa0f8248ca00e101e8e69b