In the Linux kernel, the following vulnerability has been resolved:
ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free
The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer properly at removal") patched a UAF issue caused by the error timer.
However, because the error timer kill added in this patch occurs after the endpoint delete, a race condition to UAF still occurs, albeit rarely.
Additionally, since kill-cleanup for urb is also missing, freed memory can be accessed in interrupt context related to urb, which can cause UAF.
Therefore, to prevent this, error timer and urb must be killed before freeing the heap memory.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jul 5, 2026 | Jul 5, 2026 |
| Suse | — | Upgrade kernel-obs-buildUpgrade kernel-docsUpgrade kernel-default-baseUpgrade kernel-defaultUpgrade kernel-default-develUpgrade kernel-sourceUpgrade kernel-64kbUpgrade kernel-64kb-develUpgrade kernel-zfcpdumpUpgrade kernel-develUpgrade reiserfs-kmp-defaultUpgrade kernel-macrosUpgrade kernel-default-extraUpgrade kernel-syms | Dec 5, 2025 | Nov 11, 2025 |
| Ubuntu | — | Upgrade linux-realtimeUpgrade linux-azureUpgrade linux-raspiUpgrade linux-oracleUpgrade linux-gcpUpgrade linux-awsUpgrade linuxUpgrade linux-riscv | Oct 30, 2025 | Oct 15, 2025 |
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