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CVE-2026-46018: ALSA: usb-audio: stop parsing UAC2 rates at MAX_NR_RATES

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: stop parsing UAC2 rates at MAX_NR_RATES parse_uac2_sample_rate_range() caps the number of enumerated rates at MAX_NR_RATES, but it only breaks out of the current rate loop. A malformed UAC2 RANGE response with additional triplets continues parsing the remaining triplets and repeatedly prints "invalid uac2 rates" while probe still holds register_mutex. Stop the whole parse once the cap is reached and return the number of rates collected so far.

Affected products

• Linux kernel: from 3.0.81 before 3.1; from 3.2.47 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.86 — fixed in 3.1, 5.10.258, 5.15.209, 6.1.175, 6.12.86, 6.18.27

How to fix

Upgrade to a fixed version: Linux kernel 3.1, 5.10.258, 5.15.209, 6.1.175. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0da05fedf5e1966b7e7d389866cb86fcf09f4b32
• https://git.kernel.org/stable/c/3c318f97dcc50b2e0556a1813bd6958678e881fd
• https://git.kernel.org/stable/c/4d7893a137eadb6163ea4298bf67d74b811d76ef
• https://git.kernel.org/stable/c/5436bc1b07d4656f99412dc72871d250d7d55205
• https://git.kernel.org/stable/c/a0b78639ef09b2e77974a3de3b1c07f6de3c5e56
• https://git.kernel.org/stable/c/ab5ba9fd138758ddc50222264ff246b31e397abf
• https://git.kernel.org/stable/c/ba036305323814ec1f8655313b2fa6a0f7048716
• https://git.kernel.org/stable/c/f14bd323eec4b4f0ef662520ec852e593ece1d4c
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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