Race condition in Linux kernel - CVE-2026-90106
Published: September 19, 2026
Vulnerability identifier: #VU151377
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-90106
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-90106
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3