SB2026092899 - Race condition in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98099)

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

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to trigger a race condition.

The vulnerability exists due to improper synchronization in IPv6 multicast RCU-protected list management in net/ipv6/mcast.c when concurrently modifying IPv6 multicast group memberships while lockless readers traverse the lists. A local user can modify IPv6 multicast group memberships concurrently with list traversal to trigger a race condition.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0c8f56c583c3250408367880c98e4d6fbc929315
• https://git.kernel.org/stable/c/2e46b0c9fcf7e10b64ce1630b925f47918d1f7f6