Race condition in Linux kernel - CVE-2026-98598

Vulnerability identifier: #VU156902

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98598

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service by stalling network device unregistration.

The vulnerability exists due to a race condition in the Linux kernel IPv6 routing subsystem when inserting route exceptions concurrently with route removal. A local user can trigger exception insertion for a fib6_info undergoing removal to create a reference cycle that leaks routing resources and prevents network device unregistration from completing.

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/0346ec2f080b40d95ed05b853bb9226289e75212
• https://git.kernel.org/stable/c/649ffc76ed5483b2caf35ed90d3787538efc4e53
• https://git.kernel.org/stable/c/e03e77071e75ce726d877f0a4349a28b6e1f487a

• Race condition in Linux kernel ipv6
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more