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CVE-2026-68123

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix GSO userspace truncation underflow OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb length…

Published Aug 10, 2026EPSS 0.55%

Overview

CVE-2026-68123 is a critical-severity vulnerability. It was published on August 10, 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:

openvswitch: fix GSO userspace truncation underflow

OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb

length in OVS_CB(skb)->cutlen. When a later userspace action segments a

GSO skb, queue_gso_packets() reuses that delta for each smaller segment.

A segment can then reach queue_userspace_packet() with cutlen greater

than skb->len, underflowing the length passed to skb_zerocopy().

Store the maximum preserved length instead and bound each consumer

against the current skb length. Use U32_MAX as the no-truncation

sentinel so the value remains valid if skb geometry changes before a

consumer handles it.

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/100a23b1613e9218e0af654ef102352c713f0263Refgit.kernel.org/stable/c/2623c48cc3a8da9a1886fd8f65c0e348f4406fd6Refgit.kernel.org/stable/c/4032f8ed10fcb84d41c508dfb04be96589f78dfeRefgit.kernel.org/stable/c/50a6a85f3d6b1d22d8436848606cdef5d2c490b4Refgit.kernel.org/stable/c/a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855Refgit.kernel.org/stable/c/e211b081901ffca76674082c73eeaed53524c369Refgit.kernel.org/stable/c/ea85dbcbe8d4056ecb54352f97743d138ea4c407Refgit.kernel.org/stable/c/fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-68123?

CVE-2026-68123 is a critical-severity vulnerability. It was published on August 10, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-68123?

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-2026-68123?

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-2026-68123?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-68123 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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