Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a7339e4f5788bd088bb0be1f96a6cce459676ed0 before 72888d54bae3677ecd4ba9793b7fd27ba0b27862; affected a7339e4f5788bd088bb0be1f96a6cce459676ed0 before 0c2710a36b41bf8defba83c395b99eb1660e9e9a; affected a7339e4f5788bd088bb0be1f96a6cce459676ed0 before 0203146ad450932c2d3132e367a99c49efe3122d; affected a7339e4f5788bd088bb0be1f96a6cce459676ed0 before 3819c6f255a37c4d085ce9f264f9f11bf3c2c6bb; affected a7339e4f5788bd088bb0be1f96a6cce459676ed0 before 844d83d5964b87919b958ff48405188c6ddae9cc |
| Linux / Linux | affected 5.18; unaffected 0 before 5.18; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/72888d54bae3677ecd4ba9793b7fd27ba0b27862
- https://git.kernel.org/stable/c/0c2710a36b41bf8defba83c395b99eb1660e9e9a
- https://git.kernel.org/stable/c/0203146ad450932c2d3132e367a99c49efe3122d
- https://git.kernel.org/stable/c/3819c6f255a37c4d085ce9f264f9f11bf3c2c6bb
- https://git.kernel.org/stable/c/844d83d5964b87919b958ff48405188c6ddae9cc