Detection of Error Condition Without Action Affecting kernel-rt-debug-core package, versions *


Severity

Recommended
low

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.56% (44th percentile)

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  • Snyk IDSNYK-RHEL10-KERNELRTDEBUGCORE-18995218
  • published20 Aug 2026
  • disclosed15 Aug 2026

Introduced: 15 Aug 2026

NewCVE-2026-72421  (opens in a new tab)
CWE-390  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 kernel-rt-debug-core.

NVD Description

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

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

ipv4: fib: Don't ignore error route in local/main tables.

When CONFIG_IP_MULTIPLE_TABLES is enabled but no rule is added, fib_lookup() performs route lookup directly on two tables.

Since the first lookup does not properly bail out, the result of an error route in the merged local/main table could be overwritten by another route in the default table:

unshare -n

ip link set lo up

ip route add 192.168.0.0/24 dev lo table 253

ip route add unreachable 192.168.0.0/24

ip route get 192.168.0.1

192.168.0.1 dev lo table default uid 0 cache <local>

Once a random rule is added, the error route is respected:

ip rule add table 0

ip rule del table 0

ip route get 192.168.0.1

RTNETLINK answers: No route to host

Let's fix the inconsistent behaviour.

CVSS Base Scores

version 3.1