{"apiVersion":"1.0","identifier":"CVE-2026-74501","description":"In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix use-after-free in ump_to_endpoint() create_midi2_ump() registers a card-owned snd_ump_endpoint and stores a back-pointer to its per-interface snd_usb_midi2_ump object in ump->private_data, but it never installs an ump->private_free hook and never clears that pointer. If a later step of snd_usb_midi_v2_create() fails, its error path calls free_all_midi2_umps(), which kfree()s the snd_usb_midi2_ump object while the already-registered endpoint keeps pointing at it. The created /dev/snd/umpC*D* node stays exposed, so the first operation of any UMP open, ump_to_endpoint(), dereferences the dangling ump->private_data and reads rmidi->eps[dir] out of freed memory. A malicious USB MIDI 2.0 device that makes creation fail after the endpoint is registered can thus trigger a slab use-after-free read on a subsequent open of the UMP node. Clear the endpoint-s back-pointer before freeing the object, and let ump_to_endpoint() tolerate a NULL private_data so the open/close/trigger callbacks fail cleanly (their callers already handle a NULL endpoint) instead of dereferencing a stale pointer. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>","publishedAt":"2026-08-15T13:17:55","lastModifiedAt":"2026-08-17T06:19:46","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74501","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00168,"riskScore":0,"affectedProduct":"linux","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74501","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74501","en":"https://www.redsauce.net/en/cves/CVE-2026-74501","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74501","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74501","de":"https://www.redsauce.net/de/cves/CVE-2026-74501","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74501","el":"https://www.redsauce.net/el/cves/CVE-2026-74501"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74501"}}