Local SoundWire discovery failure via premature ACPI assignment
Published Feb 27, 2024 · Updated May 11, 2026
Incorrect controller detection in Linux 5.3 through 5.15.12 allows local users to interrupt SoundWire discovery through an affected ACPI graph. The intel-sdw-acpi graph callback assigns the caller's ACPI handle before confirming that the visited node represents a SoundWire controller, so a later failed walk leaves incorrect controller information set. Reachability requires an HDA audio path that discovers SoundWire controllers through ACPI; the bounded consequence is failure of that controller-discovery operation.
Summary
What happened
Incorrect controller detection in Linux 5.3 through 5.15.12 allows local users to interrupt SoundWire discovery through an affected ACPI graph. The intel-sdw-acpi graph callback assigns the caller's ACPI handle before confirming that the visited node represents a SoundWire controller, so a later failed walk leaves incorrect controller information set. Reachability requires an HDA audio path that discovers SoundWire controllers through ACPI; the bounded consequence is failure of that controller-discovery operation.
The record
- CVE
- CVE-2021-46926
- Published
- Feb 27, 2024
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 27, 2024CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=5.3
- Affected versionversion=6f11586f4896ee448262747788a0a3faf0fe9066 <385f287f9853da402d94278e59f594501c1d1dad
- Affected versionversion=6f11586f4896ee448262747788a0a3faf0fe9066 <cce476954401e3421afafb25bbaa926050688b1d
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What is affected?
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Attacks
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