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CVE-2025-38105: ALSA: usb-audio: Kill timer properly at removal

• 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: 2025-07-03 · updated 2026-10-15

Description

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.

Affected products

• Linux kernel: from 2.6.14 before 6.6.111; from 6.7 before 6.12.52; from 6.13 before 6.15.3 — fixed in 6.12.52, 6.15.3, 6.6.111

How to fix

Upgrade to a fixed version: Linux kernel 6.12.52, 6.15.3, 6.6.111. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/06513dd6d32c37d0364db8488cfdf3e14da238a8
• https://git.kernel.org/stable/c/0718a78f6a9f04b88d0dc9616cc216b31c5f3cf1
• https://git.kernel.org/stable/c/62066758d2ae169278e5d6aea5995b1b6f6ddeb5
• https://git.kernel.org/stable/c/647410a7da46067953a53c0d03f8680eff570959
• https://git.kernel.org/stable/c/c611b9e55174e439dcd85a72969b43a95f3827a4
• https://git.kernel.org/stable/c/efaf61052b8ff9ee8968912fbaf02c2847c78ede
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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