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CVE-2026-98383

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL An LWT_SEG6LOCAL program can invalidate its cached SRH with bpf_lwt_seg6_ad…

Published Oct 9, 2026EPSS 0.16%

Overview

CVE-2026-98383 is a high-severity vulnerability. It was published on October 9, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL

An LWT_SEG6LOCAL program can invalidate its cached SRH with

bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter

may reallocate skb->head, leaving the per-CPU SRH pointer dangling.

Post-program SRH validation then writes through that pointer.

Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier

rejects this unsafe helper combination. Other LWT program types continue

to expose the helper through lwt_out_func_proto().

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/0f38472a2aa8704a6b514c0dfa9c32f3672b8f32Refgit.kernel.org/stable/c/37b18688cd18fd86d2f35c212df1611862a26cd5Refgit.kernel.org/stable/c/9f9e57b5a3a033f95f49ef9d541340cdbcb80abbRefgit.kernel.org/stable/c/b9bb0e735460751b620156f800a4279a28573392Refgit.kernel.org/stable/c/cae8674489f26edf7553fdd660599466cbb4c32fRefgit.kernel.org/stable/c/df0072be6fc373cb22f9ea854d458b04e32a03cfRefgit.kernel.org/stable/c/e4a62833adff6ef0fe7c0b90393204fe3c26b5c5Refgit.kernel.org/stable/c/fca71ead7a20290af1e2046983eeafae43d21af1

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98383?

CVE-2026-98383 is a high-severity vulnerability. It was published on October 9, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-98383?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-98383?

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-2026-98383?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98383 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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