CVE-2026-93056

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.

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EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.07%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other 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

Frequently Asked Questions

What is CVE-2026-93056? +

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.

How do I check if I'm vulnerable to CVE-2026-93056? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.