Use After Free Affecting openshift/ose-rhel-coreos-8 package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL8-OPENSHIFTOSERHELCOREOS8-21954635
- published30 Oct 2026
- disclosed28 Oct 2026
Introduced: 28 Oct 2026
NewCVE-2026-99117 (opens in a new tab)How to fix?
There is no fixed version for RHEL:8 openshift/ose-rhel-coreos-8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openshift/ose-rhel-coreos-8 package and not the openshift/ose-rhel-coreos-8 package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net: bridge: mcast: don't truncate the port group walk on teardown
__br_multicast_disable_port_ctx() and br_multicast_del_port() walk port->mglist with hlist_for_each_entry_safe(). However, br_multicast_find_del_pg() can also delete other entries from the same list through br_multicast_fwd_src_remove() or __fwd_del_star_excl().
If such an entry is the iterator's saved next node, hlist_del_init() clears its ->next and terminates the walk early. The reproducer triggers this in both teardown walks, leaving port groups in the bridge mdb with a dangling ->key.port after del_nbp() frees the port:
BUG: KASAN: slab-use-after-free in __mdb_fill_info+0x1191/0x1320 __mdb_fill_info+0x1191/0x1320 br_mdb_dump+0x594/0xe40 rtnl_mdb_dump+0x1cf/0x5d0
Use hlist_del_init_rcu() to unlink the group while preserving ->next. br_multicast_del_pg() and the teardown walks run under br->multicast_lock. The GC worker must acquire the same lock before detaching the group for destruction, so the node remains alive while the walk uses the preserved pointer.
Preserving ->next means a walk can now reach a group that an earlier iteration already deleted as a side effect. That group is off mp->ports, so br_multicast_find_del_pg() would fall through its port scan and hit the trailing WARN_ON(1). Skip such groups at the top of that helper: a port group is put on port->mglist when it is created and only unlinked when it is deleted, so hlist_unhashed() identifies exactly this case.
References
- https://access.redhat.com/security/cve/CVE-2026-99117
- https://git.kernel.org/stable/c/5a3f7a683aee56e1f15c9d53041f3236767eaae7
- https://git.kernel.org/stable/c/8243d587a081e790ad96e80d48eef44d9f7ef005
- https://git.kernel.org/stable/c/b45e8c24608c992d1e2cea047eb5bcbfa537f86b
- https://git.kernel.org/stable/c/025c25ad73323c7dc5af4ee97fe0a2c0b3c177c8
- https://git.kernel.org/stable/c/ab836d56ff43f2e7927e88c83cd02c47a98a672e
- https://git.kernel.org/stable/c/b0db9f4ff402becff710ab27dbd9f6fe4850b47e
- https://git.kernel.org/stable/c/be331b23c650de9518f8266b901d8abb9b36af77
- https://git.kernel.org/stable/c/e69d4927dacd6ddaff09777a89efc0d3143d3b0d