U.S. flag   An official website of the United States government
Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock (Dot gov) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-72421 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].

URL Source(s) Tag(s)
https://git.kernel.org/stable/c/49eaf1403201357762d745a35882fb734107d763 kernel.org
https://git.kernel.org/stable/c/5ae18d87a45698e8244d0fcba64c658c35a7dd3d kernel.org
https://git.kernel.org/stable/c/828fad4fd418bcdb9f5d66fec0d184c52a85ec31 kernel.org
https://git.kernel.org/stable/c/9127589aabdee588278e8d0d0bd3709a760a92c8 kernel.org
https://git.kernel.org/stable/c/a29e95fbc51e8a1b932773fd0e259b2080881443 kernel.org
https://git.kernel.org/stable/c/a668fa160247d7bbe921548cb845f607b8b9305f kernel.org
https://git.kernel.org/stable/c/b72f0db64205d9ce462038ba995d5d31eff32dc1 kernel.org
https://git.kernel.org/stable/c/fd25996f57a95d56bc568c89b4921edcf334b7d8 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-72421
NVD Published Date:
08/15/2026
NVD Last Modified:
08/15/2026
Source:
kernel.org