What’s Vulnerable › Vulnerabilities

CVE-2021-47211: ALSA: usb-audio: fix null pointer dereference on pointer cs_desc

• 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: 2024-04-10 · updated 2026-06-19
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix null pointer dereference on pointer cs_desc The pointer cs_desc return from snd_usb_find_clock_source could be null, so there is a potential null pointer dereference issue. Fix this by adding a null check before dereference.

Affected products

• Linux kernel: before 5.15.5 — fixed in 5.15.5

How to fix

Upgrade to a fixed version: Linux kernel 5.15.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3455984b16eeb6914caf8b59498ef24fcc1f0a78
• https://git.kernel.org/stable/c/58fa50de595f152900594c28ec9915c169643739
• https://git.kernel.org/stable/c/b97053df0f04747c3c1e021ecbe99db675342954
• https://git.kernel.org/stable/c/58fa50de595f152900594c28ec9915c169643739
• https://git.kernel.org/stable/c/b97053df0f04747c3c1e021ecbe99db675342954

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