CVE-2022-48760

Process hangs via missing USB memory barriers

Published Jun 20, 2024 · Updated May 11, 2026

A race in the Linux kernel USB core allows local users to hang processes during concurrent USB request-block teardown. On SMP systems, usb_kill_urb() and __usb_hcd_giveback_urb() can read stale urb->use_count and urb->reject values because their atomic updates lack full memory barriers, so the completion wakeup is missed. Triggering requires concurrent URB teardown on different CPUs, and the resulting waiter can remain blocked indefinitely; the same ordering flaw affects usb_poison_urb() and a usb_hcd_submit_urb() failure path.

CVSS severity7.1
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race in the Linux kernel USB core allows local users to hang processes during concurrent USB request-block teardown. On SMP systems, usb_kill_urb() and __usb_hcd_giveback_urb() can read stale urb->use_count and urb->reject values because their atomic updates lack full memory barriers, so the completion wakeup is missed. Triggering requires concurrent URB teardown on different CPUs, and the resulting waiter can remain blocked indefinitely; the same ordering flaw affects usb_poison_urb() and a usb_hcd_submit_urb() failure path.

The record

CVE
CVE-2022-48760
Published
Jun 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 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=2.6.29
  2. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <26fbe9772b8c459687930511444ce443011f86bf
  3. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <546ba238535d925254e0b3f12012a5c55801e2f3
  4. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <5904dfd3ddaff3bf4a41c3baf0a8e8f31ed4599b
  5. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <5f138ef224dffd15d5e5c5b095859719e0038427
  6. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <9340226388c66a7e090ebb00e91ed64a753b6c26
  7. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <9c61fce322ac2ef7fecf025285353570d60e41d6
  8. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <b50f5ca60475710bbc9a3af32fbfc17b1e69c2f0
  9. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <c9a18f7c5b071dce5e6939568829d40994866ab0
  10. Affected versionversion=49367d8f1d9f26482cf7089489e90f0afd0a942c <e3b131e30e612ff0e32de6c1cb4f69f89db29193

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.29; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <26fbe9772b8c459687930511444ce443011f86bf; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <546ba238535d925254e0b3f12012a5c55801e2f3; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <5904dfd3ddaff3bf4a41c3baf0a8e8f31ed4599b; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <5f138ef224dffd15d5e5c5b095859719e0038427; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <9340226388c66a7e090ebb00e91ed64a753b6c26; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <9c61fce322ac2ef7fecf025285353570d60e41d6; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <b50f5ca60475710bbc9a3af32fbfc17b1e69c2f0; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <c9a18f7c5b071dce5e6939568829d40994866ab0; version=49367d8f1d9f26482cf7089489e90f0afd0a942c <e3b131e30e612ff0e32de6c1cb4f69f89db29193

Published CVSS scores

5.5Amazon LinuxCVSS: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
7.1CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

CWE-667Improper Locking
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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