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CVE-2021-46926: ALSA: hda: intel-sdw-acpi: harden detection of controller

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-27 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: hda: intel-sdw-acpi: harden detection of controller The existing code currently sets a pointer to an ACPI handle before checking that it's actually a SoundWire controller. This can lead to issues where the graph walk continues and eventually fails, but the pointer was set already. This patch changes the logic so that the information provided to the caller is set when a controller is found.

Affected products

• Linux kernel: before 5.15.13 — fixed in 5.15.13

How to fix

Upgrade to a fixed version: Linux kernel 5.15.13. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/385f287f9853da402d94278e59f594501c1d1dad
• https://git.kernel.org/stable/c/cce476954401e3421afafb25bbaa926050688b1d
• https://git.kernel.org/stable/c/385f287f9853da402d94278e59f594501c1d1dad
• https://git.kernel.org/stable/c/cce476954401e3421afafb25bbaa926050688b1d

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