Expired Pointer Dereference Affecting kpatch-patch-5_14_0-570_66_1 package, versions <0:1-17.el9_6


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.58% (46th percentile)

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  • Snyk IDSNYK-RHEL9-KPATCHPATCH5140570661-21891959
  • published30 Oct 2026
  • disclosed15 Aug 2026

Introduced: 15 Aug 2026

CVE-2026-74480  (opens in a new tab)
CWE-825  (opens in a new tab)

How to fix?

Upgrade RHEL:9 kpatch-patch-5_14_0-570_66_1 to version 0:1-17.el9_6 or higher.
This issue was patched in RHSA-2026:91638.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kpatch-patch-5_14_0-570_66_1 package and not the kpatch-patch-5_14_0-570_66_1 package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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 Base Scores

version 3.1