CVE-2026-74639

In the Linux kernel, the following vulnerability has been resolved: ALSA: us144mkii: re-anchor capture URBs on resubmission capture_urb_complete() resubmits each capture URB without anchoring it: usb_get_urb(urb); ret = usb_submit_urb(urb, GFP_ATOMIC); Anchoring is a property of a submission, not of the URB. The giveback path calls usb_unanchor_urb() before urb->complete(), so an URB resubmitted from its own completion handler is off the anchor. The capture URBs are anchored once, at stream start, so from the first completion onward tascam->capture_anchor is empty. tascam_free_urbs(), tascam_disconnect(), tascam_suspend() and the stop-work path all call usb_kill_anchored_urbs(&tascam->capture_anchor) to reap the capture URBs before anything is freed. With the anchor empty those calls return immediately and the URBs stay queued on the host controller. tascam_free_urbs() then returns the capture transfer buffers with usb_free_coherent(), and snd_card_free() releases the snd_card allocation that embeds tascam (card->private_data). The controller completes the queued URBs afterwards, writing device-supplied data into the freed transfer buffer, and capture_urb_complete() dereferences the freed driver object. KASAN on 7.2.0-rc5 (arm64): BUG: KASAN: slab-use-after-free in dummy_timer Write of size 512 at addr ffff000015b62000 __asan_memcpy dummy_timer hrtimer_run_softirq Allocated by task 64: usb_alloc_coherent tascam_alloc_urbs tascam_probe Freed by task 170: usb_free_coherent tascam_free_urbs tascam_disconnect usb_unbind_interface BUG: KASAN: slab-use-after-free in capture_urb_complete Read of size 4 at addr ffff0000170ee878 Freed by task 170: release_card_device snd_card_free tascam_disconnect Restore the usb_anchor_urb() between the reference count bump and the resubmission. That also makes the handler's usb_unanchor_urb() failure arm meaningful again and restores usb_kill_anchored_urbs() as a barrier on the disconnect, suspend and stop-work paths. The anchoring was removed on the premise that the URB is already anchored from the initial submission, which does not hold once the first giveback has run. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

• https://git.kernel.org/stable/c/2615f0fb90df8cf5a96133ca4be74294ed288604
• https://git.kernel.org/stable/c/7779249561d14b8a17c0c83783225794e24a587d
• https://git.kernel.org/stable/c/a5548ce916594c811bd90ce33d67baa3557a6791

Published

Aug 22, 2026

Last Modified

Aug 22, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-74633In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74634In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74635In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74636In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74637In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74638In the Linux kernel, the following vulnerability has been re…
• CVE-2026-7464The WP Google Maps Integration plugin for WordPress is vulne…6.1
• CVE-2026-74640In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74641In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74642In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74643In the Linux kernel, the following vulnerability has been re…
• CVE-2026-74644In the Linux kernel, the following vulnerability has been re…