SB2026091998 - Use-after-free in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-90111)

CWE-ID: CWE-416 - Use After Free

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

The vulnerability allows a remote attacker to trigger a slab use-after-free.

The vulnerability exists due to a use-after-free in the IPv6 multicast routing cache reporting function ip6mr_cache_report() when resolving an unresolved multicast forwarding-cache entry after its associated route has been deleted and the queue is resolved with a wrong parent interface. A remote attacker can send an ingress multicast packet that misses multicast forwarding-cache lookup to trigger a wrong-parent-interface report.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/235b42b5860189eb8c27c36435ad932cae65a734
• https://git.kernel.org/stable/c/4a674afaae4136c71943aa3e35d433676fd40e8f