CVE-2026-31635Public exploitNetwork attack vector

Service interruption via inverted authenticator length check

Published Apr 24, 2026 · Updated Apr 24, 2026

Improper length validation in the Linux Kernel allows remote attackers to trigger a kernel BUG_ON via a crafted rxrpc RESPONSE packet. rxgk_verify_response() in net/rxrpc/rxgk.c reverses the comparison between decoded auth_len and the remaining packet bytes, so an oversized authenticator reaches rxgk_decrypt_skb() and skb_to_sgvec() with an impossible length. No authentication or user interaction is required, and exploitation can interrupt service by triggering the kernel assertion.

CVSS severity7.5
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper length validation in the Linux Kernel allows remote attackers to trigger a kernel BUG_ON via a crafted rxrpc RESPONSE packet. rxgk_verify_response() in net/rxrpc/rxgk.c reverses the comparison between decoded auth_len and the remaining packet bytes, so an oversized authenticator reaches rxgk_decrypt_skb() and skb_to_sgvec() with an impossible length. No authentication or user interaction is required, and exploitation can interrupt service by triggering the kernel assertion.

The record

CVE
CVE-2026-31635
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-130, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.16
  2. Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <a2567217ade970ecc458144b6be469bc015b23e5
  3. Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <beee051f259acd286fed64c32c2b31e6f5097eb5
  4. Affected versionversion=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <a2567217ade970ecc458144b6be469bc015b23e5; version=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <beee051f259acd286fed64c32c2b31e6f5097eb5; version=9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a <e2f1a80d8b1ed6a5ae585a399c2b46500bdcc305

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-130Improper Handling of Length Parameter Inconsistency
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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