AZL-96423
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-96423.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-96423
- Upstream
- Published
- 2026-08-15T13:17:52Z
- Modified
- 2026-08-30T05:26:50Z
- Summary
- CVE-2026-74480 affecting package kernel 6.6.150.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net: bridge: stop fast-leave after deleting a port group
brmulticastleavegroup() iterates mp->ports with pp = &p->next in its fast-leave path. After brmulticastdelpg() removes p, continuing the loop advances pp through the deleted entry.
If multicast-to-unicast was enabled, the bridge can hold multiple port groups for the same port and group with different source MAC addresses. Once multicast-to-unicast is disabled, brportgroup_equal() matches those entries by port only. A fast leave can then delete one entry and continue from its stale next pointer, leaving mp->ports pointing at a deleted port group.
Fast leave only needs to remove one matching port group. Break after brmulticastdel_pg() so the loop stops before dereferencing the removed entry.
- References