{"id":"CVE-2026-80815","title":"ALSA: scarlett2: Use a private URB for the notification endpoint","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: scarlett2: Use a private URB for the notification endpoint\n\nscarlett2_init_notify() used mixer->urb, which\nsnd_usb_mixer_status_create() allocates for the UAC2 st…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < 013448eb7b0d0b91d6168685dab10e9b41baa825","Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < 4305e4b52acc0ca67dcfdf8f73dd943dab508ae8","Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < 04df0232a6976845cd9c9e83b6c26215759be667","Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < ecd2f83a4ddc078901e7104144cb6c5e5db3b7cf","Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < cd17d6ff7b7d2b1dd9bcc80ae7b4a83773f918c6","Linux 6.10"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:44:09.029Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80815","references":[{"url":"https://git.kernel.org/stable/c/013448eb7b0d0b91d6168685dab10e9b41baa825"},{"url":"https://git.kernel.org/stable/c/4305e4b52acc0ca67dcfdf8f73dd943dab508ae8"},{"url":"https://git.kernel.org/stable/c/04df0232a6976845cd9c9e83b6c26215759be667"},{"url":"https://git.kernel.org/stable/c/ecd2f83a4ddc078901e7104144cb6c5e5db3b7cf"},{"url":"https://git.kernel.org/stable/c/cd17d6ff7b7d2b1dd9bcc80ae7b4a83773f918c6"}],"tags":["cve.org"],"epss":0.00168,"epssPercentile":0.0569,"ingestedAt":"2026-10-19T09:16:01.507Z","slug":"CVE-2026-80815","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nALSA: scarlett2: Use a private URB for the notification endpoint\n\nscarlett2_init_notify() used mixer->urb, which\nsnd_usb_mixer_status_create() allocates for the UAC2 status interrupt\nendpoint and mixer.c manages. On a device with that endpoint, the\n\"already in use\" check fires on the status URB and returns 0 for\nsuccess without doing anything. No notification URB is submitted, and\ncmd_done is left zeroed because it is initialised past that check and\nnowhere else. scarlett2_usb_init() then issues SCARLETT2_USB_INIT_1\nand wait_for_completion_timeout() would crash adding to the zeroed\nwait.head.\n\nUse a separate URB in scarlett2_data, as done for FCP, and initialise\ncmd_done in scarlett2_init_private(). mixer.c was also freeing the URB\nin snd_usb_mixer_free() and resubmitting it in\nsnd_usb_mixer_activate(), so scarlett2 must now do both: add\nscarlett2_cleanup_urb(), called from private_free and private_suspend,\nand a private_resume callback to re-establish the URB after resume.\nscarlett2_init_notify() is reached from there, and the URB kill path\nin scarlett2_notify() completes cmd_done, leaving a stale count that\nwould satisfy the next command's wait before the device ACKs. Use\nreinit_completion() to clear it.\n\nAlso free the URB if the transfer buffer allocation fails, and both if\nusb_submit_urb() fails. Move scarlett2_init_notify() up next to\nscarlett2_cleanup_urb() so scarlett2_init_private() can reference it\nwithout a forward declaration.\n\n## Affected\n\n- `Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < 013448eb7b0d0b91d6168685dab10e9b41baa825`\n- `Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < 4305e4b52acc0ca67dcfdf8f73dd943dab508ae8`\n- `Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < 04df0232a6976845cd9c9e83b6c26215759be667`\n- `Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < ecd2f83a4ddc078901e7104144cb6c5e5db3b7cf`\n- `Linux >= 1b65088958cadab04d5d34a8615e2466b1b48ecb < cd17d6ff7b7d2b1dd9bcc80ae7b4a83773f918c6`\n- `Linux 6.10`\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":[]}