CVE-2026-31633

Status: AnalyzedCritical (9.8)—

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

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base score: 9.8

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.69%
Percentile among all scored CVEs: 51
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access85 %
Primary impactT1059 Command and Scripting Interpreterexecution75 %

AV:N/PR:N/UI:N indica explotación remota sin privilegios (T1190). Integer overflow en verificación de token permite bypass de seguridad en servicio de red RxRPC, potenciando ejecución de código.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account Management Vulnerability Scanning Restrict Web-Based Content Network Segmentation Limit Software Installation Limit Access to Resource Over Network

Affected technologies (1)

Linux — Linux Kernel

CWEs

CWE-190

References

Raw JSON (NVD)

Show

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