ALSA: usb-audio: stop parsing UAC2 rates at MAX_NR_RATES

Summary

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.

Timeline

1. May 27, 2026, 12:56 PM UTCCVE published
2. Oct 15, 2026, 1:19 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 4fa0e81b83503900be277e6273a79651b375e288 · fixed in 5436bc1b07d4656f99412dc72871d250d7d55205; From 4fa0e81b83503900be277e6273a79651b375e288 · fixed in 0da05fedf5e1966b7e7d389866cb86fcf09f4b32; From 4fa0e81b83503900be277e6273a79651b375e288 · fixed in f14bd323eec4b4f0ef662520ec852e593ece1d4c; From 4fa0e81b83503900be277e6273a79651b375e288 · fixed in ab5ba9fd138758ddc50222264ff246b31e397abf; From 4fa0e81b83503900be277e6273a79651b375e288 · fixed in ba036305323814ec1f8655313b2fa6a0f7048716; From 4fa0e81b83503900be277e6273a79651b375e288 · fixed in 4d7893a137eadb6163ea4298bf67d74b811d76ef; From 4fa0e81b83503900be277e6273a79651b375e288 · fixed in a0b78639ef09b2e77974a3de3b1c07f6de3c5e56; From 4fa0e81b83503900be277e6273a79651b375e288 · fixed in 3c318f97dcc50b2e0556a1813bd6958678e881fd; From 3.0.81 · fixed in 3.1; From 3.2.47 · fixed in 3.3

• Linux Linux

  3.3

• KernelLinux

  From 3.3.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.140; From 6.7.0 · fixed in 6.12.86; From 6.13.0 · fixed in 6.18.27; From 6.19.0 · fixed in 7.0.4

References 8