ALSA: scarlett2: Use a private URB for the notification endpoint

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80815
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:09 UTC
Updated2026-09-04 16:18:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: scarlett2: Use a private URB for the notification endpoint scarlett2_init_notify() used mixer->urb, which snd_usb_mixer_status_create() allocates for the UAC2 status interrupt endpoint and mixer.c manages. On a device with that endpoint, the "already in use" check fires on the status URB and returns 0 for success without doing anything. No notification URB is submitted, and cmd_done is left zeroed because it is initialised past that check and nowhere else. scarlett2_usb_init() then issues SCARLETT2_USB_INIT_1 and wait_for_completion_timeout() would crash adding to the zeroed wait.head. Use a separate URB in scarlett2_data, as done for FCP, and initialise cmd_done in scarlett2_init_private(). mixer.c was also freeing the URB in snd_usb_mixer_free() and resubmitting it in snd_usb_mixer_activate(), so scarlett2 must now do both: add scarlett2_cleanup_urb(), called from private_free and private_suspend, and a private_resume callback to re-establish the URB after resume. scarlett2_init_notify() is reached from there, and the URB kill path in scarlett2_notify() completes cmd_done, leaving a stale count that would satisfy the next command's wait before the device ACKs. Use reinit_completion() to clear it. Also free the URB if the transfer buffer allocation fails, and both if usb_submit_urb() fails. Move scarlett2_init_notify() up next to scarlett2_cleanup_urb() so scarlett2_init_private() can reference it without a forward declaration.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063060000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1b65088958cadab04d5d34a8615e2466b1b48ecb 013448eb7b0d0b91d6168685dab10e9b41baa825 git Not specified
CNA Linux Linux affected 1b65088958cadab04d5d34a8615e2466b1b48ecb 4305e4b52acc0ca67dcfdf8f73dd943dab508ae8 git Not specified
CNA Linux Linux affected 1b65088958cadab04d5d34a8615e2466b1b48ecb 04df0232a6976845cd9c9e83b6c26215759be667 git Not specified
CNA Linux Linux affected 1b65088958cadab04d5d34a8615e2466b1b48ecb ecd2f83a4ddc078901e7104144cb6c5e5db3b7cf git Not specified
CNA Linux Linux affected 1b65088958cadab04d5d34a8615e2466b1b48ecb cd17d6ff7b7d2b1dd9bcc80ae7b4a83773f918c6 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.106 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.47 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.11 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.1 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ecd2f83a4ddc078901e7104144cb6c5e5db3b7cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/04df0232a6976845cd9c9e83b6c26215759be667 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4305e4b52acc0ca67dcfdf8f73dd943dab508ae8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/013448eb7b0d0b91d6168685dab10e9b41baa825 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cd17d6ff7b7d2b1dd9bcc80ae7b4a83773f918c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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