CVE-2022-50484

Service interruption via unreleased USB-audio URBs

Published Oct 4, 2025 · Updated Oct 4, 2025

Resource leakage in the Linux kernel ALSA USB-audio driver allows local users to exhaust kernel memory during sync endpoint setup. In sound/usb/endpoint.c, the allocation-error handler sees ep->nurbs as zero after a mid-loop failure and therefore skips partially allocated URBs. Reaching the condition requires local activity that drives sync endpoint setup into an allocation failure; repeated leaks can deplete memory and interrupt service.

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

What happened

Resource leakage in the Linux kernel ALSA USB-audio driver allows local users to exhaust kernel memory during sync endpoint setup. In sound/usb/endpoint.c, the allocation-error handler sees ep->nurbs as zero after a mid-loop failure and therefore skips partially allocated URBs. Reaching the condition requires local activity that drives sync endpoint setup into an allocation failure; repeated leaks can deplete memory and interrupt service.

The record

CVE
CVE-2022-50484
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0604e5e5537af099ea2f6dfd892afe5c92db8a80
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0672215994e2347a9b4f145e2bc1709b1e01cee3
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28d8d267af5d73f91d7640cbdb4024703256e36c
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46f0aed47673e275d682af60ed26dcc28add8eae
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6382da0828995af87aa8b8bef28cc61aceb4aff3
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <988ec0cd0a2643c25c1658f7c33de2e15a5a2e31
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bc1d16d282bca421c6fc31de4b8fd412010f01bd
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e4442410f76d66b9f7e854010bce04853f665324
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <faa8c1ed77d0169955b9b3516b714cc5fb512f27

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0604e5e5537af099ea2f6dfd892afe5c92db8a80; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0672215994e2347a9b4f145e2bc1709b1e01cee3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28d8d267af5d73f91d7640cbdb4024703256e36c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46f0aed47673e275d682af60ed26dcc28add8eae; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6382da0828995af87aa8b8bef28cc61aceb4aff3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <988ec0cd0a2643c25c1658f7c33de2e15a5a2e31; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bc1d16d282bca421c6fc31de4b8fd412010f01bd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e4442410f76d66b9f7e854010bce04853f665324; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <faa8c1ed77d0169955b9b3516b714cc5fb512f27

Published CVSS scores

5.5Amazon LinuxCVSS: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 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

T1499.004Endpoint Denial of Service: Application 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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