CVE-2026-31639

Local service interruption via leaked key references

Published Apr 24, 2026 · Updated Apr 24, 2026

Resource leak in the Linux kernel allows local users to exhaust key references through repeated RxRPC client calls. rxrpc_alloc_client_call() acquires call->key, but rxrpc_destroy_call() omits the corresponding key_put(), leaving each destroyed call's key reference live. Low-privileged local access and the ability to create RxRPC client calls are required; sustained repetition can deplete kernel resources and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux kernel allows local users to exhaust key references through repeated RxRPC client calls. rxrpc_alloc_client_call() acquires call->key, but rxrpc_destroy_call() omits the corresponding key_put(), leaving each destroyed call's key reference live. Low-privileged local access and the ability to create RxRPC client calls are required; sustained repetition can deplete kernel resources and interrupt service.

The record

CVE
CVE-2026-31639
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

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

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Is a vulnerable build present?

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

  1. Affected versionversion=6.2
  2. Affected versionversion=f3441d4125fc98995858550a5521b8d7daf0504a <2e6ef713b1598f6acd7f302fa6b12b6731c89914
  3. Affected versionversion=f3441d4125fc98995858550a5521b8d7daf0504a <978108902ee4ef2b348ff7ec36ad014dc5bc6dc6
  4. Affected versionversion=f3441d4125fc98995858550a5521b8d7daf0504a <d666540d217e8d420544ebdfbadeedd623562733
  5. Affected versionversion=f3441d4125fc98995858550a5521b8d7daf0504a <e6b7943c5dc875647499da09bf4d50a8557ab0c3
  6. Affected versionversion=f3441d4125fc98995858550a5521b8d7daf0504a <f1a7a3ab0f35f83cf11bba906b9e948cf3788c28

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.2; version=f3441d4125fc98995858550a5521b8d7daf0504a <2e6ef713b1598f6acd7f302fa6b12b6731c89914; version=f3441d4125fc98995858550a5521b8d7daf0504a <978108902ee4ef2b348ff7ec36ad014dc5bc6dc6; version=f3441d4125fc98995858550a5521b8d7daf0504a <d666540d217e8d420544ebdfbadeedd623562733; version=f3441d4125fc98995858550a5521b8d7daf0504a <e6b7943c5dc875647499da09bf4d50a8557ab0c3; version=f3441d4125fc98995858550a5521b8d7daf0504a <f1a7a3ab0f35f83cf11bba906b9e948cf3788c28

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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No observations available

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

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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