CVE-2022-49308

Local kernel crash via extcon initialization race

Published Feb 26, 2025 · Updated May 11, 2026

NULL-pointer dereference in the Linux kernel extcon subsystem allows local users to crash the kernel through a timed sysfs read. The extcon registration path exposes sysfs attributes before dev_set_drvdata stores the extcon_dev pointer, so state_show can fetch NULL and dereference it. Exploitation requires local access during the narrow device-registration interval, and a successful race produces a kernel Oops that interrupts the system.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in the Linux kernel extcon subsystem allows local users to crash the kernel through a timed sysfs read. The extcon registration path exposes sysfs attributes before dev_set_drvdata stores the extcon_dev pointer, so state_show can fetch NULL and dereference it. Exploitation requires local access during the narrow device-registration interval, and a successful race produces a kernel Oops that interrupts the system.

The record

CVE
CVE-2022-49308
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE 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=3.5
  2. Affected versionversion=de55d8716ac50a356cea736c29bb7db5ac3d0190 <033ec4e7e59ae5e1ef1e8c10bc6552926044ed1c
  3. Affected versionversion=de55d8716ac50a356cea736c29bb7db5ac3d0190 <35ff1ac55d301efb3f467cf5426faaeb3452994b
  4. Affected versionversion=de55d8716ac50a356cea736c29bb7db5ac3d0190 <368e68ad6da4317fc4170e8d92b51c13d1bfe7a7
  5. Affected versionversion=de55d8716ac50a356cea736c29bb7db5ac3d0190 <5dcc2afe716d69f5112ce035cb14f007461ff189
  6. Affected versionversion=de55d8716ac50a356cea736c29bb7db5ac3d0190 <6e721f3ad0535b24f19a62420f4da95212cf069c
  7. Affected versionversion=de55d8716ac50a356cea736c29bb7db5ac3d0190 <abf3b222614f49f98e606fccdd269161c0d70204
  8. Affected versionversion=de55d8716ac50a356cea736c29bb7db5ac3d0190 <cb81ea998c461868d1168411a867d8ffee12f23f
  9. Affected versionversion=de55d8716ac50a356cea736c29bb7db5ac3d0190 <d472c78cc82999d07bd09193a6718016ce9cd386

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=de55d8716ac50a356cea736c29bb7db5ac3d0190 <033ec4e7e59ae5e1ef1e8c10bc6552926044ed1c; version=de55d8716ac50a356cea736c29bb7db5ac3d0190 <35ff1ac55d301efb3f467cf5426faaeb3452994b; version=de55d8716ac50a356cea736c29bb7db5ac3d0190 <368e68ad6da4317fc4170e8d92b51c13d1bfe7a7; version=de55d8716ac50a356cea736c29bb7db5ac3d0190 <5dcc2afe716d69f5112ce035cb14f007461ff189; version=de55d8716ac50a356cea736c29bb7db5ac3d0190 <6e721f3ad0535b24f19a62420f4da95212cf069c; version=de55d8716ac50a356cea736c29bb7db5ac3d0190 <abf3b222614f49f98e606fccdd269161c0d70204; version=de55d8716ac50a356cea736c29bb7db5ac3d0190 <cb81ea998c461868d1168411a867d8ffee12f23f; version=de55d8716ac50a356cea736c29bb7db5ac3d0190 <d472c78cc82999d07bd09193a6718016ce9cd386

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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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