Local ioctl hang via stale ALSA FIFO cells
Published Aug 15, 2026 · Updated Aug 15, 2026
Race condition in the Linux ALSA sequencer allows local users to hang FIFO pool teardown during concurrent queue resizing. Event-in and putback paths can relink an old-pool cell after snd_seq_fifo_resize swaps pools, leaving the retired pool counter elevated. Access to ALSA sequencer ioctls and a concurrent resize-and-relink race are required; the demonstrated consequence is a blocked resize ioctl, not a system crash.
Summary
What happened
Race condition in the Linux ALSA sequencer allows local users to hang FIFO pool teardown during concurrent queue resizing. Event-in and putback paths can relink an old-pool cell after snd_seq_fifo_resize swaps pools, leaving the retired pool counter elevated. Access to ALSA sequencer ioctls and a concurrent resize-and-relink race are required; the demonstrated consequence is a blocked resize ioctl, not a system crash.
The record
- CVE
- CVE-2026-74261
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-911, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=28e0ebdd57cd3287ac821068364b74c70af3861c
- Affected versionversion=2d7d54002e396c180db0c800c1046f0a3c471597 <1c4c35fb68d520241f7d9f1c356b5e2370fd8364
- Affected versionversion=2d7d54002e396c180db0c800c1046f0a3c471597 <98a965cb1e767b54b6bbd831b6cea26f521a8f51
- Affected versionversion=2d7d54002e396c180db0c800c1046f0a3c471597 <e546128291f8d688dcb931827e2efd2aa6c0734d
- Affected versionversion=3.10.107 <3.11
- Affected versionversion=3.12.73 <3.13
- Affected versionversion=3.16.46 <3.17
- Affected versionversion=3.18.50 <3.19
- Affected versionversion=3.2.91 <3.3
- Affected versionversion=3492352e1f34673708fa7409b4b1d97545aa2f1c
- Affected versionversion=4.10.9 <4.11
- Affected versionversion=4.11
- Affected versionversion=4.1.40 <4.2
- Affected versionversion=4.4.60 <4.5
- Affected versionversion=4.9.21 <4.10
- Affected versionversion=74a2c1ff88a4e0960623d17f7db56ac5a60bb0cf
- Affected versionversion=9ebfed203c0d93449a074c5c2fd5bb3e58518f0d
- Affected versionversion=a90d7447e4a154ad26e3b9e09a0878680be49339
- Affected versionversion=c36ef6467420f8982e6d4d6f93d0634a85a5ee45
- Affected versionversion=d4b8e8a32d74052fe292618ae19f794944ddc673
- Affected versionversion=df7a2d0af9f7ab73cf22a7b62bbc0bad93a02110
- Affected versionversion=e91325f27c4d98d1088e9e86b3ab475f752eeb80
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What is affected?
Published CVSS scores
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Attacks
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