CVE-2022-49310

Service interruption via XillyUSB device refcount leak

Published Feb 26, 2025 · Updated May 11, 2026

A refcount leak in the XillyUSB driver in Linux allows local users to exhaust kernel resources during USB device cleanup. xillyusb_probe() increments the USB device reference with usb_get_dev(), but cleanup_dev() releases xdev without the matching usb_put_dev(), leaving the device object referenced. Reaching the leak requires low-privilege local access and a probed Xillybus USB FPGA device; repeated cleanup can retain kernel objects and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A refcount leak in the XillyUSB driver in Linux allows local users to exhaust kernel resources during USB device cleanup. xillyusb_probe() increments the USB device reference with usb_get_dev(), but cleanup_dev() releases xdev without the matching usb_put_dev(), leaving the device object referenced. Reaching the leak requires low-privilege local access and a probed Xillybus USB FPGA device; repeated cleanup can retain kernel objects and interrupt service.

The record

CVE
CVE-2022-49310
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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=5.14
  2. Affected versionversion=a53d1202aef122894b6e46116a92174a9123db5d <21f1f167d727f3f857e26d509ef5a6d47fd31bc3
  3. Affected versionversion=a53d1202aef122894b6e46116a92174a9123db5d <b67d19662fdee275c479d21853bc1239600a798f
  4. Affected versionversion=a53d1202aef122894b6e46116a92174a9123db5d <bc8fceda3b89006e8a7dda8a097d36045d044c25
  5. Affected versionversion=a53d1202aef122894b6e46116a92174a9123db5d <e277b95acdab84cd5d2f8d537a37aef6d21e988b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=a53d1202aef122894b6e46116a92174a9123db5d <21f1f167d727f3f857e26d509ef5a6d47fd31bc3; version=a53d1202aef122894b6e46116a92174a9123db5d <b67d19662fdee275c479d21853bc1239600a798f; version=a53d1202aef122894b6e46116a92174a9123db5d <bc8fceda3b89006e8a7dda8a097d36045d044c25; version=a53d1202aef122894b6e46116a92174a9123db5d <e277b95acdab84cd5d2f8d537a37aef6d21e988b

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

T1499Endpoint Denial of Service

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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