CVE-2026-74480

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-74480

Key Details

CVE	CVE-2026-74480
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74480
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74480

Source

Reference

NVD

CVE