CVE-2024-56657

Kernel panic via ALSA symlink error warning

Published Dec 27, 2024 · Updated Jun 1, 2026

Denial of service in affected Linux kernel builds starting at 5.13 allows local users to crash the kernel through an ALSA symlink error. The snd_ctl_led_sysfs_add function passes either ALSA control-device sysfs_create_link failure to WARN() rather than logging an ordinary error. Reachability requires local low-privilege access and a control-device registration that makes symlink creation fail; a crash additionally requires panic_on_warn to be enabled.

CVSS severity5.5
Medium
EPSS probability0.22%
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 affected Linux kernel builds starting at 5.13 allows local users to crash the kernel through an ALSA symlink error. The snd_ctl_led_sysfs_add function passes either ALSA control-device sysfs_create_link failure to WARN() rather than logging an ordinary error. Reachability requires local low-privilege access and a control-device registration that makes symlink creation fail; a crash additionally requires panic_on_warn to be enabled.

The record

CVE
CVE-2024-56657
Published
Dec 27, 2024
Updated
Jun 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 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=5.13
  2. Affected versionversion=a135dfb5de1501327895729b4f513370d2555b4d <365ee29e559269cbb2108c4cc05dd8e262b4e84e
  3. Affected versionversion=a135dfb5de1501327895729b4f513370d2555b4d <36c0764474b637bbee498806485bed524cad486b
  4. Affected versionversion=a135dfb5de1501327895729b4f513370d2555b4d <4e5a92a7223c83c1f5f2db6cd010ac9347948972
  5. Affected versionversion=a135dfb5de1501327895729b4f513370d2555b4d <b2e538a9827dd04ab5273bf4be8eb2edb84357b0
  6. Affected versionversion=a135dfb5de1501327895729b4f513370d2555b4d <d5a1ca7b59804d6779644001a878ed925a4688ca

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=a135dfb5de1501327895729b4f513370d2555b4d <365ee29e559269cbb2108c4cc05dd8e262b4e84e; version=a135dfb5de1501327895729b4f513370d2555b4d <36c0764474b637bbee498806485bed524cad486b; version=a135dfb5de1501327895729b4f513370d2555b4d <4e5a92a7223c83c1f5f2db6cd010ac9347948972; version=a135dfb5de1501327895729b4f513370d2555b4d <b2e538a9827dd04ab5273bf4be8eb2edb84357b0; version=a135dfb5de1501327895729b4f513370d2555b4d <d5a1ca7b59804d6779644001a878ed925a4688ca

Published CVSS scores

5.5CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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 exploitUnconfirmed

Weakness, pattern, technique

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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