CVE-2026-31647

Local service interruption via nested driver locks

Published Apr 24, 2026 · Updated Apr 24, 2026

Denial of service in the Linux kernel idpf driver allows local users to interrupt service through asynchronous VC handling. The transaction manager reuses a completion object's raw spinlock while idpf_mac_filter_async_handler takes a bottom-half spinlock, creating invalid lock nesting on PREEMPT_RT. Reachability requires low-privileged local access, a PREEMPT_RT kernel, and active idpf virtual-channel processing; the published impact is limited to availability.

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

Denial of service in the Linux kernel idpf driver allows local users to interrupt service through asynchronous VC handling. The transaction manager reuses a completion object's raw spinlock while idpf_mac_filter_async_handler takes a bottom-half spinlock, creating invalid lock nesting on PREEMPT_RT. Reachability requires low-privileged local access, a PREEMPT_RT kernel, and active idpf virtual-channel processing; the published impact is limited to availability.

The record

CVE
CVE-2026-31647
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
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=34c21fa894a1af6166f4284c81d1dc21efed8f38 <3bb632c6b6d8154e9019beda4a43a4b518ee3e8a
  2. Affected versionversion=34c21fa894a1af6166f4284c81d1dc21efed8f38 <591478118293c1bd628de330a99eb1eb2ef8d76b
  3. Affected versionversion=34c21fa894a1af6166f4284c81d1dc21efed8f38 <b448529f2f2921c6fe82fd4e985cc7c05cbf02a3
  4. Affected versionversion=34c21fa894a1af6166f4284c81d1dc21efed8f38 <e02c974fc331f04b5ba2007d4bc6862df8a43148
  5. Affected versionversion=6.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=34c21fa894a1af6166f4284c81d1dc21efed8f38 <3bb632c6b6d8154e9019beda4a43a4b518ee3e8a; version=34c21fa894a1af6166f4284c81d1dc21efed8f38 <591478118293c1bd628de330a99eb1eb2ef8d76b; version=34c21fa894a1af6166f4284c81d1dc21efed8f38 <b448529f2f2921c6fe82fd4e985cc7c05cbf02a3; version=34c21fa894a1af6166f4284c81d1dc21efed8f38 <e02c974fc331f04b5ba2007d4bc6862df8a43148; version=6.9

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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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