CVE-2026-93122
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel USB gadget UAC1/UAC2 module, configfs rate-list attributes did not validate the input length before storing values into fixed-size arrays of UAC_MAX_RATES (10) entries. Supplying more than ten rates caused an out-of-bounds write past p_srates[] or c_srates[], leading to memory corruption. Additionally, freeing the advanced strsep() cursor caused a memory leak or an interior pointer free.
Risk Assessment
A local user able to write to configfs attributes could trigger kernel memory corruption, potentially causing a system crash (panic) or privilege escalation. The risk affects systems using USB gadget with UAC1/UAC2 configuration.
Recommendation
Update the Linux kernel to a version containing the fix that rejects excess tokens once UAC_MAX_RATES entries are parsed and preserves the original pointer for kfree(). Until patched, restrict access to UAC configfs attributes to trusted users only.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uac: validate rate list length before storing UAC1 and UAC2 configfs rate-list attributes parse a comma-separated list of sampling rates and store each parsed value in fixed-size arrays. The arrays have UAC_MAX_RATES entries, but the store paths do not check that the input contains at most that many tokens before writing through opts->name##s[i++]. Writing more than ten rates therefore writes past the end of the p_srates[] or c_srates[] array in struct f_uac1_opts or struct f_uac2_opts. With CONFIG_UBSAN_BOUNDS enabled, writing an 11-entry rate list to the UAC1 p_srate attribute reports: UBSAN: array-index-out-of-bounds drivers/usb/gadget/function/f_uac1.c:1669:1 index 10 is out of range for type 'int [10]' __ubsan_handle_out_of_bounds.cold f_uac1_opts_p_srate_store configfs_write_iter vfs_write ksys_write do_syscall_64 The same reproducer against the UAC2 p_srate attribute reports: UBSAN: array-index-out-of-bounds drivers/usb/gadget/function/f_uac2.c:2087:1 index 10 is out of range for type 'int [10]' __ubsan_handle_out_of_bounds.cold f_uac2_opts_p_srate_store configfs_write_iter vfs_write ksys_write do_syscall_64 Reject additional tokens once UAC_MAX_RATES entries have been parsed. Also keep the original kstrdup() pointer for kfree(), because strsep() advances the parsing cursor. Freeing the advanced cursor leaks the original buffer on successful parses and can free an interior pointer on some error paths.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS