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CVE-2026-93056: usb: gadget: f_uac1_legacy: remove broken string configfs attributes

• Severity: unknown
• 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: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_uac1_legacy: remove broken string configfs attributes The UAC1_STR_ATTRIBUTE macro defines configfs show/store handlers for the fn_play, fn_cap, and fn_cntl string options. The store function contains an inverted null check on the kstrndup() return value. This means every write attempt returns -ENOMEM on success and dereferences a NULL pointer on allocation failure. The attributes have been broken and unused for many years. Remove the UAC1_STR_ATTRIBUTE macro and the three attributes it generated. The internal defaults (FILE_PCM_PLAYBACK, FILE_PCM_CAPTURE, FILE_CONTROL) set in f_audio_alloc_inst() are unaffected.

Affected products

• Linux kernel: 3.18 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/021b58ac3e58cffa68ed9585ff492a19e98414f6
• https://git.kernel.org/stable/c/2ed25c9d4400cf90d9201657963a231c27a5ea57
• https://git.kernel.org/stable/c/590d74ec8f488e06b9f1c0f8f0941f45531f3a55
• https://git.kernel.org/stable/c/6351ba62778f72dc4f6bc18bfa99e618829cff0d
• https://git.kernel.org/stable/c/745adfe6c337f3d5d7737d57529d14a208151b45
• https://git.kernel.org/stable/c/8b9335aec93975bb9186d63993a5a610e5066ffc
• https://git.kernel.org/stable/c/977659adb341f6e30fb00dcf183f63f29df879e2
• https://git.kernel.org/stable/c/fd43eae7d539ea7cfc7c9f0d3f0eaa890415e8a7

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