CVE-2024-56532

Soft lockup via synchronous USB card teardown

Published Dec 27, 2024 · Updated May 11, 2026

Improper locking in the Linux ALSA us122l driver allows local users to trigger a soft lockup by disconnecting a USB audio device. The us122l USB disconnect callback calls snd_card_free(), which synchronously waits for every open file descriptor and blocks upper-layer USB ioctls. Exploitation requires local access to an open device and control of a supported USB audio device; the bounded consequence is a kernel hang or configured panic.

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 the Linux ALSA us122l driver allows local users to trigger a soft lockup by disconnecting a USB audio device. The us122l USB disconnect callback calls snd_card_free(), which synchronously waits for every open file descriptor and blocks upper-layer USB ioctls. Exploitation requires local access to an open device and control of a supported USB audio device; the bounded consequence is a kernel hang or configured panic.

The record

CVE
CVE-2024-56532
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
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=030a07e441296c372f946cd4065b5d831d8dc40c <020cbc4d7414f0962004213e2b7bc5cc607e9ec7
  2. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <2938dd2648522336133c151dd67bb9bf01cbd390
  3. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <75f418b249d84021865eaa59515d3ed9b75ce4d6
  4. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <9a48bd2184b142c92a4e17eac074c61fcf975bc9
  5. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <9b27924dc8d7f8a8c35e521287d4ccb9a006e597
  6. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <9d5c530e4d70f64b1114f2cc29ac690ba7ac4a38
  7. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <b7df09bb348016943f56b09dcaafe221e3f73947
  8. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <bc778ad3e495333eebda36fe91d5b2c93109cc16
  9. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <bf0aa35a7cb8602cccf2387712114e836f65c154
  10. Affected versionversion=2.6.28

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=030a07e441296c372f946cd4065b5d831d8dc40c <020cbc4d7414f0962004213e2b7bc5cc607e9ec7; version=030a07e441296c372f946cd4065b5d831d8dc40c <2938dd2648522336133c151dd67bb9bf01cbd390; version=030a07e441296c372f946cd4065b5d831d8dc40c <75f418b249d84021865eaa59515d3ed9b75ce4d6; version=030a07e441296c372f946cd4065b5d831d8dc40c <9a48bd2184b142c92a4e17eac074c61fcf975bc9; version=030a07e441296c372f946cd4065b5d831d8dc40c <9b27924dc8d7f8a8c35e521287d4ccb9a006e597; version=030a07e441296c372f946cd4065b5d831d8dc40c <9d5c530e4d70f64b1114f2cc29ac690ba7ac4a38; version=030a07e441296c372f946cd4065b5d831d8dc40c <b7df09bb348016943f56b09dcaafe221e3f73947; version=030a07e441296c372f946cd4065b5d831d8dc40c <bc778ad3e495333eebda36fe91d5b2c93109cc16; version=030a07e441296c372f946cd4065b5d831d8dc40c <bf0aa35a7cb8602cccf2387712114e836f65c154; version=2.6.28

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS: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-667Improper Locking
T1499.004Application or System Exploitation

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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