CVE-2024-56587

Kernel crash via unlocked LED brightness access

Published Dec 27, 2024 · Updated May 11, 2026

Race condition in the Linux kernel LED class allows local users to crash the kernel by reading LED brightness during HID setup. The brightness_show() and max_brightness_show() paths access led_cdev fields without holding led_access while HID registration can leave the device state unavailable. Triggering the race requires local access to the LED sysfs attribute during concurrent HID device addition, and the resulting NULL dereference interrupts the system.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel LED class allows local users to crash the kernel by reading LED brightness during HID setup. The brightness_show() and max_brightness_show() paths access led_cdev fields without holding led_access while HID registration can leave the device state unavailable. Triggering the race requires local access to the LED sysfs attribute during concurrent HID device addition, and the resulting NULL dereference interrupts the system.

The record

CVE
CVE-2024-56587
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, 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=2.6.26
  2. Affected versionversion=29d76dfa29fe22583aefddccda0bc56aa81035dc <4ca7cd938725a4050dcd62ae9472e931d603118d
  3. Affected versionversion=29d76dfa29fe22583aefddccda0bc56aa81035dc <50d9f68e4adf86901cbab1bd5b91f710aa9141b9
  4. Affected versionversion=29d76dfa29fe22583aefddccda0bc56aa81035dc <84b42d5b5fcd767c9b7f30b0b32065ed949fe804
  5. Affected versionversion=29d76dfa29fe22583aefddccda0bc56aa81035dc <b8283d52ed15c02bb2eb9b1b8644dcc34f8e98f1
  6. Affected versionversion=29d76dfa29fe22583aefddccda0bc56aa81035dc <bb4a6236a430cfc3713f470f3a969f39d6d4ca25
  7. Affected versionversion=29d76dfa29fe22583aefddccda0bc56aa81035dc <ddcfc5708da9972ac23a9121b3d819b0a53d6f21
  8. Affected versionversion=29d76dfa29fe22583aefddccda0bc56aa81035dc <f6d6fb563e4be245a17bc4261a4b294e8bf8a31e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.26; version=29d76dfa29fe22583aefddccda0bc56aa81035dc <4ca7cd938725a4050dcd62ae9472e931d603118d; version=29d76dfa29fe22583aefddccda0bc56aa81035dc <50d9f68e4adf86901cbab1bd5b91f710aa9141b9; version=29d76dfa29fe22583aefddccda0bc56aa81035dc <84b42d5b5fcd767c9b7f30b0b32065ed949fe804; version=29d76dfa29fe22583aefddccda0bc56aa81035dc <b8283d52ed15c02bb2eb9b1b8644dcc34f8e98f1; version=29d76dfa29fe22583aefddccda0bc56aa81035dc <bb4a6236a430cfc3713f470f3a969f39d6d4ca25; version=29d76dfa29fe22583aefddccda0bc56aa81035dc <ddcfc5708da9972ac23a9121b3d819b0a53d6f21; version=29d76dfa29fe22583aefddccda0bc56aa81035dc <f6d6fb563e4be245a17bc4261a4b294e8bf8a31e

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

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

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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