CVE-2026-31633Critical· 9.8▾ Midnight

rxrpc: Fix integer overflow in rxgk_verify_response()

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, …

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score54/ 100 · Moderate

impact 53.9 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Apr 24, 2026

Updated

Oct 19, 2026

CVSS

9.8

Vendor

Linux

Product

Linux

CWE

—

Depth score

54 · Moderate

EPSS

0.47% · p40

Platforms

—

Source

CVEORG

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

decided 2026-10-16

Exploitation: none
Automatable: yes
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 16.

0.5% → 0.5%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 178 days

Apr 24, 2026Published
Disclosed via CVEORG
Oct 16, 2026EPSS first tracked
0.5%
Oct 19, 2026Record revised
Last analysed / modified upstream

Linux #cve.org

Affected

Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < 1f864d9daaf622aeaa774404fd51e7d6a435b046
Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < c1e242beb6b1efc3c286f617e8d940c8fbf2ed41
Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < 699e52180f4231c257821c037ed5c99d5eb0edb8
Linux 6.16

Full technical detail▾

Overview

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).

Affected

Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < 1f864d9daaf622aeaa774404fd51e7d6a435b046
Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < c1e242beb6b1efc3c286f617e8d940c8fbf2ed41
Linux >= 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a < 699e52180f4231c257821c037ed5c99d5eb0edb8
Linux 6.16

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#cve.org

rxrpc: Fix integer overflow in rxgk_verify_response()

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score54/ 100 · Moderate

impact 53.9 · likelihood 0.1 · exploitation 0

Overview

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).