CVE-2025-71097 Affecting kernel-uek-doc package, versions <0:5.15.0-318.199.3.2.el9uek


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-ORACLE9-KERNELUEKDOC-15332455
  • published23 Feb 2026
  • disclosed13 Jan 2026

Introduced: 13 Jan 2026

CVE-2025-71097  (opens in a new tab)

How to fix?

Upgrade Oracle:9 kernel-uek-doc to version 0:5.15.0-318.199.3.2.el9uek or higher.
This issue was patched in ELSA-2026-50145.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-doc package and not the kernel-uek-doc package as distributed by Oracle. See How to fix? for Oracle:9 relevant fixed versions and status.

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

ipv4: Fix reference count leak when using error routes with nexthop objects

When a nexthop object is deleted, it is marked as dead and then fib_table_flush() is called to flush all the routes that are using the dead nexthop.

The current logic in fib_table_flush() is to only flush error routes (e.g., blackhole) when it is called as part of network namespace dismantle (i.e., with flush_all=true). Therefore, error routes are not flushed when their nexthop object is deleted:

ip link add name dummy1 up type dummy

ip nexthop add id 1 dev dummy1

ip route add 198.51.100.1/32 nhid 1

ip route add blackhole 198.51.100.2/32 nhid 1

ip nexthop del id 1

ip route show

blackhole 198.51.100.2 nhid 1 dev dummy1

As such, they keep holding a reference on the nexthop object which in turn holds a reference on the nexthop device, resulting in a reference count leak:

ip link del dev dummy1

[ 70.516258] unregister_netdevice: waiting for dummy1 to become free. Usage count = 2

Fix by flushing error routes when their nexthop is marked as dead.

IPv6 does not suffer from this problem.

CVSS Base Scores

version 3.1