CVE-2026-74480
Linux kernel vulnerability
- Published15 Aug 2026
Description
In the Linux kernel, the following vulnerability has been resolved: net: bridge: stop fast-leave after deleting a port group br_multicast_leave_group() iterates mp->ports with pp = &p->next in its fast-leave path. After br_multicast_del_pg() 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, br_port_group_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 br_multicast_del_pg() so the loop stops before dereferencing the removed entry.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HRemediation
No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.
References
- https://git.kernel.org/stable/c/0309ebbc570000ea0df11c06b69798e5860c5f6f
- https://git.kernel.org/stable/c/159ad90cb929c033308bb39a2c5f8fbf393b77aa
- https://git.kernel.org/stable/c/1a109cc9890d017c41d77e6c82da739579c49f0b
- https://git.kernel.org/stable/c/4695430e8132420bf8de94da3eb36a6cf35fde6b
- https://git.kernel.org/stable/c/482bcb85139addb4e8ac8ed10baeda3e0aad4031
- https://git.kernel.org/stable/c/4c57056ca6aace2e9f94ae9298bf49ef6b0c95e4
- https://git.kernel.org/stable/c/a39789f211b8a4125f0c70e05b30cf715f4f187d
- https://git.kernel.org/stable/c/d6c32e2e25a9a06ba021030e26b6d602a277eb72
Frequently asked
Is CVE-2026-74480 being actively exploited?
CVE-2026-74480 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.58%.
How severe is CVE-2026-74480?
CVE-2026-74480 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.58% probability of exploitation.
How do I fix CVE-2026-74480?
Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2026-74480 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.