SB20260919108 - Race condition in Linux kernel net vxlan driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-90105)

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:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause partial reads of neighbor hardware addresses.

The vulnerability exists due to a race condition in the VXLAN arp_reduce and neigh_reduce functions when processing ARP or IPv6 neighbor-discovery traffic during a neighbor hardware-address update. A remote attacker can send network traffic to cause partial reads of neighbor hardware addresses.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/b824059a673b2283e78c7aae2c7d257aad7f0e1d
• https://git.kernel.org/stable/c/ecc8bac11a101e5f6989a14b92e17b51f9761630