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CVE-2026-43238

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash() Commit 38a6f0865796 ("net: sched: support hash selecting tx qu…

Published May 6, 2026CWE-369EPSS 0.16%

Overview

CVE-2026-43238 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()

Commit 38a6f0865796 ("net: sched: support hash selecting tx queue")

added SKBEDIT_F_TXQ_SKBHASH support. The inclusive range size is

computed as:

mapping_mod = queue_mapping_max - queue_mapping + 1;

The range size can be 65536 when the requested range covers all possible

u16 queue IDs (e.g. queue_mapping=0 and queue_mapping_max=U16_MAX).

That value cannot be represented in a u16 and previously wrapped to 0,

so tcf_skbedit_hash() could trigger a divide-by-zero:

queue_mapping += skb_get_hash(skb) % params->mapping_mod;

Compute mapping_mod in a wider type and reject ranges larger than U16_MAX

to prevent params->mapping_mod from becoming 0 and avoid the crash.

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/015cebdfcb97b5347fb7f598ea712a281cb35840Refgit.kernel.org/stable/c/3c2b95b26860bd6f8e2310d31ea1200d3f8f173eRefgit.kernel.org/stable/c/4ece5eb4836f8ff03b9004dc2430a7169f282851Refgit.kernel.org/stable/c/59809fda4da7730cfe84a948033f47eb45db073dRefgit.kernel.org/stable/c/9c735a7d98c982a786b0db71eb6566ee00aaa04fRefgit.kernel.org/stable/c/be054cc66f739a9ba615dba9012a07fab8e7dd6f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43238?

CVE-2026-43238 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43238?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43238?

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-2026-43238?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43238 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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