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CVE-2026-72351

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: gue: validate REMCSUM private option length GUE private flags can indicate that remote checksum offload metadata is present.

Published Aug 15, 2026EPSS 0.74%

Overview

CVE-2026-72351 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. 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:

gue: validate REMCSUM private option length

GUE private flags can indicate that remote checksum offload metadata is

present. The private flags field itself is accounted for by

guehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even

when GUE_PFLAG_REMCSUM is set.

This lets a packet with only the private flags field pass

validate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum()

read the missing REMCSUM start/offset fields from the following bytes.

Account for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that

malformed packets are rejected during option validation.

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/158b9995d3c87f3b93f5c22df54a12e12a3438b3Refgit.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1eRefgit.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14Refgit.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692aRefgit.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafdRefgit.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0Refgit.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450Refgit.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72351?

CVE-2026-72351 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-72351?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-72351?

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-2026-72351?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72351 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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