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CVE-2026-45843

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: slip: bound decode() reads against the compressed packet length slhc_uncompress() parses a VJ-compressed TCP header by advancin…

Published May 27, 2026EPSS 0.55%

Overview

CVE-2026-45843 is a high-severity vulnerability. It was published on May 27, 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:

slip: bound decode() reads against the compressed packet length

slhc_uncompress() parses a VJ-compressed TCP header by advancing a

pointer through the packet via decode() and pull16(). Neither helper

bounds-checks against isize, and decode() masks its return with

& 0xffff so it can never return the -1 that callers test for -- those

error paths are dead code.

A short compressed frame whose change byte requests optional fields

lets decode() read past the end of the packet. The over-read bytes

are folded into the cached cstate and reflected into subsequent

reconstructed packets.

Make decode() and pull16() take the packet end pointer and return -1

when exhausted. Add a bounds check before the TCP-checksum read.

The existing == -1 tests now do what they were always meant to.

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/0511ecb00e61bf28e2fec4bb41fcce385c3a3b2dRefgit.kernel.org/stable/c/335957df4ed60f02a2ec0432fbedbf0cc7241d8bRefgit.kernel.org/stable/c/37537e42e6df387398bee85cb85070cc80bb1e10Refgit.kernel.org/stable/c/4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7Refgit.kernel.org/stable/c/4cefe32639933d652614b0bd50f818f9af4af78fRefgit.kernel.org/stable/c/6268f01ae989013671b526c883e92655342c6f6fRefgit.kernel.org/stable/c/9aafba2f49e1fcccc2018816f5836a609c925879Refgit.kernel.org/stable/c/d42bec6e4f6d6d658be365539400b3314b76b2a7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45843?

CVE-2026-45843 is a high-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-45843?

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-2026-45843?

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-2026-45843?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45843 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.

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