Race condition in Linux kernel - CVE-2026-98604

Vulnerability identifier: #VU156910

CSH Severity: Low

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98604

CWE-ID: CWE-362

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause inconsistent local endpoint address reads and potentially disrupt VPN traffic.

The vulnerability exists due to a race condition in the Linux kernel ovpn driver's local endpoint learning when updating a shared bind address concurrently with UDP transmission. A remote attacker can send traffic that triggers local endpoint learning during transmission to cause a torn IPv6 address read, potentially disrupting VPN traffic.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/21dbc9f4d0bdd3b22f91beabc7840064bf11594f
• https://git.kernel.org/stable/c/aea934a221ec6a867221e5b765f65f1857befd53
• https://git.kernel.org/stable/c/e283009151d3d131447c2edda500199c5fda5f72

• Race condition in Linux kernel net ovpn driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more