Kernel memory corruption via asynchronous audio teardown
Published Sep 11, 2026 · Updated Sep 11, 2026
Use-after-free in Linux kernel USB gadget audio allows local users to corrupt kernel memory during sound card disconnect. g_audio_cleanup() starts asynchronous ALSA card teardown but immediately frees snd_uac_chip, leaving open control callbacks with dangling private_data pointers. Reachability requires an enabled USB audio gadget, an open ALSA control descriptor, gadget teardown, and later access to or closure of that descriptor.
Summary
What happened
Use-after-free in Linux kernel USB gadget audio allows local users to corrupt kernel memory during sound card disconnect. g_audio_cleanup() starts asynchronous ALSA card teardown but immediately frees snd_uac_chip, leaving open control callbacks with dangling private_data pointers. Reachability requires an enabled USB audio gadget, an open ALSA control descriptor, gadget teardown, and later access to or closure of that descriptor.
The record
- CVE
- CVE-2026-89736
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 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=0eda2004f38d95ef5715d62be884cd344260535b
- Affected versionversion=3256e152b645fc1e788ba44c2d8ced690113e3e6
- Affected versionversion=33f341c1fc60e172a3515c51bdabee11e83d1ee9
- Affected versionversion=3bc7324e4911351e39c54a62e6ca46321cb10faf
- Affected versionversion=3e016ef2e72da93a2ea7afbb45de1b481b44d761
- Affected versionversion=4.14.312 <4.15
- Affected versionversion=4.19.280 <4.20
- Affected versionversion=43ca70753dfffd517d2af126da28690f8f615605
- Affected versionversion=5.10.177 <5.11
- Affected versionversion=5.15.105 <5.16
- Affected versionversion=5.4.240 <5.5
- Affected versionversion=6.1.22 <6.2
- Affected versionversion=6.2.9 <6.3
- Affected versionversion=6.3
- Affected versionversion=6c67ed9ad9b83e453e808f9b31a931a20a25629b <4e747c864a88537e18b1ffc19a1954c9686bb8e1
- Affected versionversion=6c67ed9ad9b83e453e808f9b31a931a20a25629b <79a92896e2bb9471550c56fc23d8d93592f04c27
- Affected versionversion=6c67ed9ad9b83e453e808f9b31a931a20a25629b <858965947081d10d41d9a1010a540d3d5eea958b
- Affected versionversion=6c67ed9ad9b83e453e808f9b31a931a20a25629b <c74ff0b1a0fca53d3ac185873c87d6a719b30a47
- Affected versionversion=b131989797f7287d7fdadb2bababc05a15d44750
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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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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