CVE-2026-31680 Affecting kernel-uek-modules package, versions <0:6.12.0-204.92.4.2.el10uek


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.12% (3rd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ORACLE10-KERNELUEKMODULES-17845239
  • published6 Jul 2026
  • disclosed25 Apr 2026

Introduced: 25 Apr 2026

CVE-2026-31680  (opens in a new tab)

How to fix?

Upgrade Oracle:10 kernel-uek-modules to version 0:6.12.0-204.92.4.2.el10uek or higher.
This issue was patched in ELSA-2026-50372.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-modules package and not the kernel-uek-modules package as distributed by Oracle. See How to fix? for Oracle:10 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

net: ipv6: flowlabel: defer exclusive option free until RCU teardown

ip6fl_seq_show() walks the global flowlabel hash under the seq-file RCU read-side lock and prints fl-&gt;opt-&gt;opt_nflen when an option block is present.

Exclusive flowlabels currently free fl-&gt;opt as soon as fl-&gt;users drops to zero in fl_release(). However, the surrounding struct ip6_flowlabel remains visible in the global hash table until later garbage collection removes it and fl_free_rcu() finally tears it down.

A concurrent /proc/net/ip6_flowlabel reader can therefore race that early kfree() and dereference freed option state, triggering a crash in ip6fl_seq_show().

Fix this by keeping fl-&gt;opt alive until fl_free_rcu(). That matches the lifetime already required for the enclosing flowlabel while readers can still reach it under RCU.

CVSS Base Scores

version 3.1