CVE-2022-49936

Kernel hang via unchecked nested USB reset

Published Jun 18, 2025 · Updated May 11, 2026

Denial of service in the Linux USB core allows local users to hang reset processing by removing a device during an existing reset. While rtl8712 is unbound from a composite device, r871xu_dev_remove calls usb_reset_device, and the USB core starts a nested reset without checking whether one is already in progress. Reachability requires local low-privileged access and the affected rtl8712 composite-device path; recursive interface-mutex acquisition stalls reset work.

CVSS severity5.5
Medium
EPSS probability0.17%
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 the Linux USB core allows local users to hang reset processing by removing a device during an existing reset. While rtl8712 is unbound from a composite device, r871xu_dev_remove calls usb_reset_device, and the USB core starts a nested reset without checking whether one is already in progress. Reachability requires local low-privileged access and the affected rtl8712 composite-device path; recursive interface-mutex acquisition stalls reset work.

The record

CVE
CVE-2022-49936
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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=2.6.27
  2. Affected versionversion=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <1b29498669914c7f9afb619722421418a753d372
  3. Affected versionversion=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <9c6d778800b921bde3bff3cff5003d1650f942d1
  4. Affected versionversion=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <abe3cfb7a7c8e907b312c7dbd7bf4d142b745aa8
  5. Affected versionversion=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <c548b99e1c37db6f7df86ecfe9a1f895d6c5966e
  6. Affected versionversion=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <cc9a12e12808af178c600cc485338bac2e37d2a8
  7. Affected versionversion=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <d5eb850b3e8836197a38475840725260b9783e94
  8. Affected versionversion=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <d90419b8b8322b6924f6da9da952647f2dadc21b
  9. Affected versionversion=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <df1875084898b15cbc42f712e93d7f113ae6271b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <1b29498669914c7f9afb619722421418a753d372; version=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <9c6d778800b921bde3bff3cff5003d1650f942d1; version=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <abe3cfb7a7c8e907b312c7dbd7bf4d142b745aa8; version=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <c548b99e1c37db6f7df86ecfe9a1f895d6c5966e; version=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <cc9a12e12808af178c600cc485338bac2e37d2a8; version=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <d5eb850b3e8836197a38475840725260b9783e94; version=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <d90419b8b8322b6924f6da9da952647f2dadc21b; version=78d9a487ee961c356e1a934d9a92eca38ffb3a70 <df1875084898b15cbc42f712e93d7f113ae6271b

Published CVSS scores

5.5CanonicalCVSS: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

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

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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