CVE-2024-56533Public exploit

Local soft lockup via synchronous USB teardown

Published Dec 27, 2024 · Updated May 11, 2026

Improper locking in affected Linux kernel branches allows local users to cause a soft lockup by disconnecting an open usx2y USB device. The snd_usx2y_disconnect callback calls snd_card_free, which waits for every open sound-card file descriptor instead of deferring resource release. Reachability requires local access, a connected usx2y USB audio device, an open descriptor, and device disconnection; the resulting stall blocks upper-layer USB ioctls.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in affected Linux kernel branches allows local users to cause a soft lockup by disconnecting an open usx2y USB device. The snd_usx2y_disconnect callback calls snd_card_free, which waits for every open sound-card file descriptor instead of deferring resource release. Reachability requires local access, a connected usx2y USB audio device, an open descriptor, and device disconnection; the resulting stall blocks upper-layer USB ioctls.

The record

CVE
CVE-2024-56533
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=230cd5e24853ed4dd960461989b8ed0986d37a99 <24fe9f7ca83ec9acf765339054951f5cd9ae5c5d
  2. Affected versionversion=230cd5e24853ed4dd960461989b8ed0986d37a99 <7bd8838c0ea886679a32834fdcacab296d072fbe
  3. Affected versionversion=230cd5e24853ed4dd960461989b8ed0986d37a99 <befcca1777525e37c659b4129d8ac7463b07ef67
  4. Affected versionversion=230cd5e24853ed4dd960461989b8ed0986d37a99 <dafb28f02be407e07a6f679e922a626592b481b0
  5. Affected versionversion=230cd5e24853ed4dd960461989b8ed0986d37a99 <e07605d855c4104d981653146a330ea48f6266ed
  6. Affected versionversion=230cd5e24853ed4dd960461989b8ed0986d37a99 <e869642a77a9b3b98b0ab2c8fec7af4385140909
  7. Affected versionversion=230cd5e24853ed4dd960461989b8ed0986d37a99 <ffbfc6c4330fc233698529656798bee44fea96f5
  8. Affected versionversion=2.6.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=230cd5e24853ed4dd960461989b8ed0986d37a99 <24fe9f7ca83ec9acf765339054951f5cd9ae5c5d; version=230cd5e24853ed4dd960461989b8ed0986d37a99 <7bd8838c0ea886679a32834fdcacab296d072fbe; version=230cd5e24853ed4dd960461989b8ed0986d37a99 <befcca1777525e37c659b4129d8ac7463b07ef67; version=230cd5e24853ed4dd960461989b8ed0986d37a99 <dafb28f02be407e07a6f679e922a626592b481b0; version=230cd5e24853ed4dd960461989b8ed0986d37a99 <e07605d855c4104d981653146a330ea48f6266ed; version=230cd5e24853ed4dd960461989b8ed0986d37a99 <e869642a77a9b3b98b0ab2c8fec7af4385140909; version=230cd5e24853ed4dd960461989b8ed0986d37a99 <ffbfc6c4330fc233698529656798bee44fea96f5; version=2.6.13

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical UbuntuCVSS: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

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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 exploitPublished

Weakness, pattern, technique

CWE-667Improper Locking
T1499Endpoint Denial of Service

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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