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 linux-6.1Upgrade linux | Jul 5, 2026 | Jul 5, 2026 |
| Suse | — | Upgrade kernel-symsUpgrade kernel-64kbUpgrade kernel-sourceUpgrade kernel-zfcpdumpUpgrade kernel-default-develUpgrade kernel-64kb-develUpgrade kernel-macrosUpgrade kernel-default-extraUpgrade reiserfs-kmp-defaultUpgrade kernel-develUpgrade kernel-defaultUpgrade kernel-default-baseUpgrade kernel-obs-buildUpgrade kernel-docs | Dec 5, 2025 | Nov 11, 2025 |
| Ubuntu | — | Upgrade linux-oracleUpgrade linux-raspiUpgrade linux-realtimeUpgrade linux-azureUpgrade linux-gcpUpgrade linuxUpgrade linux-awsUpgrade linux-riscv | Oct 30, 2025 | Oct 15, 2025 |
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