CVE-2026-93056

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux0854611a19ae4dfa56569e6f640017a1d2dd3312 < 745adfe6c337f3d5d7737d57529d14a208151b45affected
LinuxLinux0854611a19ae4dfa56569e6f640017a1d2dd3312 < 6351ba62778f72dc4f6bc18bfa99e618829cff0daffected
LinuxLinux0854611a19ae4dfa56569e6f640017a1d2dd3312 < 021b58ac3e58cffa68ed9585ff492a19e98414f6affected
LinuxLinux0854611a19ae4dfa56569e6f640017a1d2dd3312 < fd43eae7d539ea7cfc7c9f0d3f0eaa890415e8a7affected
LinuxLinux0854611a19ae4dfa56569e6f640017a1d2dd3312 < 8b9335aec93975bb9186d63993a5a610e5066ffcaffected
LinuxLinux0854611a19ae4dfa56569e6f640017a1d2dd3312 < 2ed25c9d4400cf90d9201657963a231c27a5ea57affected
LinuxLinux0854611a19ae4dfa56569e6f640017a1d2dd3312 < 977659adb341f6e30fb00dcf183f63f29df879e2affected
LinuxLinux0854611a19ae4dfa56569e6f640017a1d2dd3312 < 590d74ec8f488e06b9f1c0f8f0941f45531f3a55affected
LinuxLinux3.18affected
LinuxLinux0 < 3.18unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References