SB20261022176 - Race condition in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98598)

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

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

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