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CVE-2026-63926

8.4 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: sockmap: fix tail fragment offset in bpf_msg_push_data When bpf_msg_push_data() inserts data in the middle of a scatterlis…

Published Jul 19, 2026EPSS 0.18%

Overview

CVE-2026-63926 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

bpf: sockmap: fix tail fragment offset in bpf_msg_push_data

When bpf_msg_push_data() inserts data in the middle of a scatterlist

entry, it splits the original entry into a left fragment and a right

fragment.

The right fragment offset is page-local, but the code advances it with

`start`, which is the message-global insertion point. For inserts into a

non-first SG entry, this over-advances the offset and leaves the split

layout inconsistent.

Advance the right fragment offset by the fragment-local delta,

`start - offset`, which matches the length removed from the front of the

original entry.

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/3075c21d2d76c0067f4a382765b43d6cc10470f1Refgit.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056bRefgit.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346Refgit.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96dRefgit.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94Refgit.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2Refgit.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251Refgit.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63926?

CVE-2026-63926 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-63926?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-63926?

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-2026-63926?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63926 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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