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In the Linux kernel, the following vulnerability has been resolved:
ALSA: seq: Fix race of snd_seq_timer_open()
The timer instance per queue is exclusive, and snd_seq_timer_open() should have managed the concurrent accesses. It looks as if it's checking the already existing timer instance at the beginning, but it's not right, because there is no protection, hence any later concurrent call of snd_seq_timer_open() may override the timer instance easily. This may result in UAF, as the leftover timer instance can keep running while the queue itself gets closed, as spotted by syzkaller recently.
For avoiding the race, add a proper check at the assignment of tmr->timeri again, and return -EBUSY if it's been already registered.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 21, 2024 |
| Suse | — | Upgrade kernel-default-develUpgrade kernel-source-azureUpgrade kernel-default-manUpgrade kernel-preempt-develUpgrade kernel-obs-buildUpgrade kernel-sourceUpgrade kernel-defaultUpgrade kernel-azure-baseUpgrade kernel-azure-develUpgrade kernel-azureUpgrade kernel-syms-azureUpgrade kernel-64kb-develUpgrade kernel-macrosUpgrade kernel-devel-azureUpgrade kernel-develUpgrade kernel-docsUpgrade kernel-symsUpgrade kernel-default-baseUpgrade reiserfs-kmp-defaultUpgrade kernel-default-extraUpgrade kernel-preemptUpgrade kernel-64kbUpgrade kernel-zfcpdump | Aug 9, 2024 | May 21, 2024 |
| Ubuntu | — | Upgrade linux-azure-fde-5.15No solution exists | Jun 26, 2025 | May 21, 2024 |
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