Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-72347

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_connmark: reject invalid shift parameters Revision 2 of the CONNMARK target accepts user-controlled shift paramet…

Published Aug 15, 2026EPSS 0.17%

Overview

CVE-2026-72347 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

netfilter: xt_connmark: reject invalid shift parameters

Revision 2 of the CONNMARK target accepts user-controlled shift

parameters and applies them to 32-bit mark values in

connmark_tg_shift().

A shift_bits value of 32 or more triggers an undefined-shift bug when

the rule is evaluated. Invalid shift_dir values are also accepted and

silently fall back to the left-shift path.

Reject invalid revision-2 shift parameters in connmark_tg_check() so

malformed rules fail at installation time, before they can reach the

packet path.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1b47026fb4b35bac850ad6e8a4ad7fc018e09ebcRefgit.kernel.org/stable/c/230173cc6105bdfb2696d37e6e56687b003fbe63Refgit.kernel.org/stable/c/4eef84b09a3836919360c4232b0f16651a155eecRefgit.kernel.org/stable/c/8ace320ac4416f5e5fbcd065309fb2dfcce787b0Refgit.kernel.org/stable/c/9657bb11a6376ab0a79f05d433713d6944111e9dRefgit.kernel.org/stable/c/c3fa852d117b3fda72265e4230e3967db4a74fcfRefgit.kernel.org/stable/c/d8ce63d928b457fba7ed1e302492dfd32293671c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72347?

CVE-2026-72347 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-72347?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-72347?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-72347?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72347 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999