ALSA: usb-audio: Kill timer properly at removal

Summary

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Kill timer properly at removal The USB-audio MIDI code initializes the timer, but in a rare case, the driver might be freed without the disconnect call. This leaves the timer in an active state while the assigned object is released via snd_usbmidi_free(), which ends up with a kernel warning when the debug configuration is enabled, as spotted by fuzzer. For avoiding the problem, put timer_shutdown_sync() at snd_usbmidi_free(), so that the timer can be killed properly. While we're at it, replace the existing timer_delete_sync() at the disconnect callback with timer_shutdown_sync(), too.

Timeline

1. Jul 3, 2025, 8:35 AM UTCCVE published
2. Oct 15, 2026, 1:06 AM UTCRecord last updated

Affected versions

• Linux Linux

  From c88469704d63787e8d44ca5ea1c1bd0adc29572d · fixed in 06513dd6d32c37d0364db8488cfdf3e14da238a8; From c88469704d63787e8d44ca5ea1c1bd0adc29572d · fixed in efaf61052b8ff9ee8968912fbaf02c2847c78ede; From c88469704d63787e8d44ca5ea1c1bd0adc29572d · fixed in 647410a7da46067953a53c0d03f8680eff570959; From c88469704d63787e8d44ca5ea1c1bd0adc29572d · fixed in c611b9e55174e439dcd85a72969b43a95f3827a4; From c88469704d63787e8d44ca5ea1c1bd0adc29572d · fixed in 62066758d2ae169278e5d6aea5995b1b6f6ddeb5; From c88469704d63787e8d44ca5ea1c1bd0adc29572d · fixed in 0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1

• Linux Linux

  2.6.14

• KernelLinux

  From 2.6.14 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.111; From 6.7.0 · fixed in 6.12.52; From 6.13.0 · fixed in 6.15.3

References 6