Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-23456

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case In decode_int(), the CONS case calls get_bits(bs, 2) to re…

Published Apr 3, 2026CWE-125EPSS 0.52%

Overview

CVE-2026-23456 is a high-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case

In decode_int(), the CONS case calls get_bits(bs, 2) to read a length

value, then calls get_uint(bs, len) without checking that len bytes

remain in the buffer. The existing boundary check only validates the

2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint()

reads. This allows a malformed H.323/RAS packet to cause a 1-4 byte

slab-out-of-bounds read.

Add a boundary check for len bytes after get_bits() and before

get_uint().

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/1e3a3593162c96e8a8de48b1e14f60c3b57fca8aRefgit.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482dRefgit.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20Refgit.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebbRefgit.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2Refgit.kernel.org/stable/c/a2cd54b9348e485d338b3c132338a4410c99afafRefgit.kernel.org/stable/c/c95dc674ebf01ecfb40388b6facfc89b81fed3b7Refgit.kernel.org/stable/c/fb6c3596823ec5dd09c2123340330d7448f51a59Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23456?

CVE-2026-23456 is a high-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-23456?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-23456?

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-2026-23456?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23456 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