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CVE-2026-31633

Linux Kernel integer overflow

9.8 CRITICALEPSS 0.69%
  1. Published24 Apr 2026

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix integer overflow in rxgk_verify_response() In rxgk_verify_response(), there's a potential integer overflow due to rounding up token_len before checking it, thereby allowing the length check to be bypassed. Fix this by checking the unrounded value against len too (len is limited as the response must fit in a single UDP packet).

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux Kernel≥ 6.16.1 < 6.18.23 · ≥ 6.19 < 6.19.13 · 6.16 · 7.0

Remediation

Fixed in
Linux Kernel≥ 6.18.23

References

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Frequently asked

Is CVE-2026-31633 being actively exploited?

CVE-2026-31633 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.69%.

How severe is CVE-2026-31633?

CVE-2026-31633 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.69% probability of exploitation.

Which products are affected by CVE-2026-31633?

Affected products include Linux Kernel.

How do I fix CVE-2026-31633?

Upgrade affected software to a fixed version, for example Linux Kernel 6.18.23 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.