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CVE-2026-31423

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_hfsc: fix divide-by-zero in rtsc_min() m2sm() converts a u32 slope to a u64 scaled value.

Published Apr 13, 2026CWE-369EPSS 0.17%

Overview

CVE-2026-31423 is a medium-severity vulnerability. It was published on April 13, 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: sch_hfsc: fix divide-by-zero in rtsc_min()

m2sm() converts a u32 slope to a u64 scaled value. For large inputs

(e.g. m1=4000000000), the result can reach 2^32. rtsc_min() stores

the difference of two such u64 values in a u32 variable `dsm` and

uses it as a divisor. When the difference is exactly 2^32 the

truncation yields zero, causing a divide-by-zero oops in the

concave-curve intersection path:

Oops: divide error: 0000

RIP: 0010:rtsc_min (net/sched/sch_hfsc.c:601)

Call Trace:

init_ed (net/sched/sch_hfsc.c:629)

hfsc_enqueue (net/sched/sch_hfsc.c:1569)

[...]

Widen `dsm` to u64 and replace do_div() with div64_u64() so the full

difference is preserved.

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/17c1b9807b8a67d676b6dcf749ee932ebaa7f568Refgit.kernel.org/stable/c/25b6821884713a31e2b49fb67b0ebd765b33e0a9Refgit.kernel.org/stable/c/4576100b8cd03118267513cafacde164b498b322Refgit.kernel.org/stable/c/ab1ff5890c7354afc7be56502fcfbd61f3b7ae4fRefgit.kernel.org/stable/c/ad8e8fec40290a8c8cf145c0deaadf76f80c5163Refgit.kernel.org/stable/c/b9e6431cbea8bb1fae8069ed099b4ee100499835Refgit.kernel.org/stable/c/c56f78614e7781aaceca9bd3cb2128bf7d45c3bdRefgit.kernel.org/stable/c/d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31423?

CVE-2026-31423 is a medium-severity vulnerability. It was published on April 13, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31423?

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-2026-31423?

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-2026-31423?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31423 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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