CVE-2026-31443

System crash via unallocated event-log restoration

Published Apr 22, 2026 · Updated Apr 22, 2026

A denial-of-service flaw in the Linux Kernel idxd DMA driver allows local users to crash affected systems after a Function Level Reset. During configuration restoration, idxd_device_config_restore dereferences idxd->evl even when unsupported hardware never allocated the event log; the free path likewise lacks a null check. Reachability requires local low-privileged access, hardware without event-log error reporting, and an error that triggers FLR; the reported consequence is a system crash.

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

A denial-of-service flaw in the Linux Kernel idxd DMA driver allows local users to crash affected systems after a Function Level Reset. During configuration restoration, idxd_device_config_restore dereferences idxd->evl even when unsupported hardware never allocated the event log; the free path likewise lacks a null check. Reachability requires local low-privileged access, hardware without event-log error reporting, and an error that triggers FLR; the reported consequence is a system crash.

The record

CVE
CVE-2026-31443
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-824, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=6078a315aec15e0776fa90347cf4eba7478cdbd7 <0e761079d653c25f838380cf7cef2730832110cc
  2. Affected versionversion=6078a315aec15e0776fa90347cf4eba7478cdbd7 <52d2edea0d63c935e82631e4b9e4a94eccf97b5b
  3. Affected versionversion=6078a315aec15e0776fa90347cf4eba7478cdbd7 <aa0ffc6d3990ec35976308a068dc23178037e564
  4. Affected versionversion=6.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6078a315aec15e0776fa90347cf4eba7478cdbd7 <0e761079d653c25f838380cf7cef2730832110cc; version=6078a315aec15e0776fa90347cf4eba7478cdbd7 <52d2edea0d63c935e82631e4b9e4a94eccf97b5b; version=6078a315aec15e0776fa90347cf4eba7478cdbd7 <aa0ffc6d3990ec35976308a068dc23178037e564; version=6.14

Published CVSS scores

5.5UbuntuCVSS: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

CWE-824Access of Uninitialized Pointer
T1499Endpoint Denial of Service

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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