Use-after-free in Linux kernel - CVE-2026-90111
Published: September 19, 2026
Vulnerability identifier: #VU151366
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-90111
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-90111
Install security update from vendor's repository.