Local PCM operation hang via AB/BA deadlock
Published Feb 26, 2025 · Updated May 11, 2026
Deadlock in Linux kernel ALSA PCM 5.10.109, 5.15.32, 5.16.18, and 5.17.1 allows local users to hang PCM operations. Concurrent OSS mmap reconfiguration holds mmap_lock while ALSA or OSS PCM reads and writes hold buffer_mutex and enter copy_to_user or copy_from_user, reversing lock order. Low-privileged local access and overlapping mmap with PCM I/O are required; the resulting AB/BA lock cycle blocks audio operations without reported data exposure or modification.
Summary
What happened
Deadlock in Linux kernel ALSA PCM 5.10.109, 5.15.32, 5.16.18, and 5.17.1 allows local users to hang PCM operations. Concurrent OSS mmap reconfiguration holds mmap_lock while ALSA or OSS PCM reads and writes hold buffer_mutex and enter copy_to_user or copy_from_user, reversing lock order. Low-privileged local access and overlapping mmap with PCM I/O are required; the resulting AB/BA lock cycle blocks audio operations without reported data exposure or modification.
The record
- CVE
- CVE-2022-49272
- Published
- Feb 26, 2025
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 26, 2025CVE publishedPublication date reported by the CVE source.
- May 11, 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=08d1807f097a63ea00a7067dad89c1c81cb2115e <9661bf674d6a82b76e4ae424438a8ce1e3ed855d
- Affected versionversion=47711ff10c7e126702cfa725f6d86ef529d15a5f <7777744e92a0b30e3e0cce2758d911837011ebd9
- Affected versionversion=4d1b0ace2d56dc27cc4921eda7fae57f77f03eb5 <abedf0d08c79d76da0d6fa0d5dbbc98871dcbc2e
- Affected versionversion=5.10.109 <5.10.110
- Affected versionversion=5.15.32 <5.15.33
- Affected versionversion=5.16.18 <5.16.19
- Affected versionversion=5.17.1 <5.17.2
- Affected versionversion=73867cb2bc7dfa7fbd219e53a0b68d253d8fda09 <7e9133607e1501c94881be35e118d8f84d96dcb4
- Affected versionversion=8527c8f052fb42091c6569cb928e472376a4a889 <9017201e8d8c6d1472273361389ed431188584a0
- Affected versionversion=b3830197aa7413c65767cf5a1aa8775c83f0dbf7 <40f4cffbe13a51faf136faf5f9ef6847782cd595
- Affected versionversion=dca947d4d26dbf925a64a6cfb2ddbc035e831a3d <bc55cfd5718c7c23e5524582e9fa70b4d10f2433
- Affected versionversion=dd2f8c684da3e226e5ec7a81c89ff5fd4a957a03 <be9813ad2fc8f0885f5ce6925af0d993ce5da4e5
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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