SB20260928101 - Race condition in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98102)

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

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause incorrect IPv6 multicast source filtering.

The vulnerability exists due to improper synchronization in ip6_mc_del1_src() when removing active IPv6 multicast source filters concurrently with RCU-protected list traversal. A local user can trigger concurrent source-filter removal and list traversal to cause incorrect IPv6 multicast source filtering.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af
• https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa
• https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4
• https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1