{"id":"CVE-2026-98769","title":"usb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd\n\ngeneric_set_cmd() and generic_get_cmd() use the low nibble of\nctrl->bRequest as an index i…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c47d7b09891abb4f8b222317c89c7469bed8db3a < 36f3f009049bc91e14dc856007932473318d12f8","Linux >= c47d7b09891abb4f8b222317c89c7469bed8db3a < 8c611876c002d712ae5f246af5188432c708f79d","Linux >= c47d7b09891abb4f8b222317c89c7469bed8db3a < 697cfe6e53b66cda196d6f8833b0ee97fefd0a8a","Linux >= c47d7b09891abb4f8b222317c89c7469bed8db3a < 9062d50e75c24dc7911be05c9b1719b3b256af15","Linux 2.6.31"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:48:04.800Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98769","references":[{"url":"https://git.kernel.org/stable/c/36f3f009049bc91e14dc856007932473318d12f8"},{"url":"https://git.kernel.org/stable/c/8c611876c002d712ae5f246af5188432c708f79d"},{"url":"https://git.kernel.org/stable/c/697cfe6e53b66cda196d6f8833b0ee97fefd0a8a"},{"url":"https://git.kernel.org/stable/c/9062d50e75c24dc7911be05c9b1719b3b256af15"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.493Z","slug":"CVE-2026-98769","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd\n\ngeneric_set_cmd() and generic_get_cmd() use the low nibble of\nctrl->bRequest as an index into con->data[]:\n\n    u8 cmd = (ctrl->bRequest & 0x0F);  /* 0 .. 15 */\n    ...\n    con->data[cmd] = value;            /* OOB when cmd >= 5 */\n\nstruct usb_audio_control (include/linux/usb/audio.h) declares data as\na 5-element array, so indices 5 through 15 write (or read) up to 44\nbytes past the end of the array on the heap.\n\nA malicious USB host can craft a class-specific SET_CUR / GET_CUR\nrequest with an arbitrary bRequest value, triggering the out-of-bounds\naccess from an IRQ completion handler with no further preconditions.\n\nAdd an ARRAY_SIZE() guard to both functions.\n\n## Affected\n\n- `Linux >= c47d7b09891abb4f8b222317c89c7469bed8db3a < 36f3f009049bc91e14dc856007932473318d12f8`\n- `Linux >= c47d7b09891abb4f8b222317c89c7469bed8db3a < 8c611876c002d712ae5f246af5188432c708f79d`\n- `Linux >= c47d7b09891abb4f8b222317c89c7469bed8db3a < 697cfe6e53b66cda196d6f8833b0ee97fefd0a8a`\n- `Linux >= c47d7b09891abb4f8b222317c89c7469bed8db3a < 9062d50e75c24dc7911be05c9b1719b3b256af15`\n- `Linux 2.6.31`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}