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CVE-2026-53091

8.4 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: pull headers in qdisc_pkt_len_segs_init() Most ndo_start_xmit() methods expects headers of gso packets to be already in sk…

Published Jun 24, 2026CWE-131EPSS 0.14%

Overview

CVE-2026-53091 is a high-severity vulnerability. It was published on June 24, 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. Some level of privileges is required for exploitation.

Technical description

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

net: pull headers in qdisc_pkt_len_segs_init()

Most ndo_start_xmit() methods expects headers of gso packets

to be already in skb->head.

net/core/tso.c users are particularly at risk, because tso_build_hdr()

does a memcpy(hdr, skb->data, hdr_len);

qdisc_pkt_len_segs_init() already does a dissection of gso packets.

Use pskb_may_pull() instead of skb_header_pointer() to make

sure drivers do not have to reimplement this.

Some malicious packets could be fed, detect them so that we can

drop them sooner with a new SKB_DROP_REASON_SKB_BAD_GSO drop_reason.

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/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4Refgit.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999aRefaccess.redhat.com/security/cve/CVE-2026-53091Refbugzilla.redhat.com/show_bug.cgi?id=2492270Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53091.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53091?

CVE-2026-53091 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-53091?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53091?

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-2026-53091?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53091 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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