CVE-2026-46018

Device-probe denial of service via excess UAC2 rates

Published May 27, 2026 · Updated May 27, 2026

Denial of service in Linux Kernel ALSA USB audio allows local users to stall device probing via a malformed UAC2 RANGE response. The parse_uac2_sample_rate_range() function stops only the current rate loop at MAX_NR_RATES, so extra triplets resume parsing and repeatedly log errors while register_mutex remains held. Exploitation requires low-privileged local access and attacker-controlled UAC2 rate data; the bounded consequence is blocked USB-audio probing rather than data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.18%
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 Linux Kernel ALSA USB audio allows local users to stall device probing via a malformed UAC2 RANGE response. The parse_uac2_sample_rate_range() function stops only the current rate loop at MAX_NR_RATES, so extra triplets resume parsing and repeatedly log errors while register_mutex remains held. Exploitation requires low-privileged local access and attacker-controlled UAC2 rate data; the bounded consequence is blocked USB-audio probing rather than data disclosure or modification.

The record

CVE
CVE-2026-46018
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=3.0.81 <3.1
  2. Affected versionversion=3.2.47 <3.3
  3. Affected versionversion=3.3
  4. Affected versionversion=44f059fb742aac78cffdab5e0d8fe0c9910c1ded
  5. Affected versionversion=4fa0e81b83503900be277e6273a79651b375e288 <3c318f97dcc50b2e0556a1813bd6958678e881fd
  6. Affected versionversion=4fa0e81b83503900be277e6273a79651b375e288 <4d7893a137eadb6163ea4298bf67d74b811d76ef
  7. Affected versionversion=4fa0e81b83503900be277e6273a79651b375e288 <a0b78639ef09b2e77974a3de3b1c07f6de3c5e56
  8. Affected versionversion=4fa0e81b83503900be277e6273a79651b375e288 <ab5ba9fd138758ddc50222264ff246b31e397abf
  9. Affected versionversion=4fa0e81b83503900be277e6273a79651b375e288 <ba036305323814ec1f8655313b2fa6a0f7048716
  10. Affected versionversion=c25a53781f61c78bf2a2fa308bbd35b42ba346f6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.0.81 <3.1; version=3.2.47 <3.3; version=3.3; version=44f059fb742aac78cffdab5e0d8fe0c9910c1ded; version=4fa0e81b83503900be277e6273a79651b375e288 <3c318f97dcc50b2e0556a1813bd6958678e881fd; version=4fa0e81b83503900be277e6273a79651b375e288 <4d7893a137eadb6163ea4298bf67d74b811d76ef; version=4fa0e81b83503900be277e6273a79651b375e288 <a0b78639ef09b2e77974a3de3b1c07f6de3c5e56; version=4fa0e81b83503900be277e6273a79651b375e288 <ab5ba9fd138758ddc50222264ff246b31e397abf; version=4fa0e81b83503900be277e6273a79651b375e288 <ba036305323814ec1f8655313b2fa6a0f7048716; version=c25a53781f61c78bf2a2fa308bbd35b42ba346f6

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.6Amazon LinuxCVSS:3.1/AV:P/AC:L/PR:N/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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