CVE-2026-80973

CVE CVE-2026-80973EUVD EUVD-2026-76296Veröffentlicht 2026-09-11T19:42:35.000ZZuletzt geändert 2026-09-14T11:59:20.000Z

Was das Advisory beschreibt

In the Linux kernel, the following vulnerability has been resolved: ALSA: 6fire: bound the MIDI event length from the device usb6fire_comm_receiver_handler() forwards a MIDI event using a length byte the device supplies, with no bound and no check that the transfer delivered that many bytes: if (!urb->status) { if (rt->receiver_buffer[0] == 0x10) /* midi in event */ if (midi_rt) midi_rt->in_received(midi_rt, rt->receiver_buffer + 2, rt->receiver_buffer[1]); } receiver_buffer is a 64-byte kzalloc() buffer (COMM_RECEIVER_BUFSIZE), so only 62 bytes follow the two-byte header. receiver_buffer[1] is a u8 the device chooses, so a device that answers with 0x10 and a length of 0xFF makes snd_rawmidi_receive() read 255 bytes starting two bytes into a 64-byte object. The bytes past the buffer are handed to userspace through the rawmidi read path. urb->actual_length is not consulted either, so a short transfer leaves both the type byte and the length byte at their previous values and the handler acts on stale data. The receiver URB is submitted from usb6fire_comm_init() at probe, so the read happens on plug with no user action; forwarding to userspace also needs a MIDI input substream open, since usb6fire_midi_in_received() only calls snd_rawmidi_receive() when rt->in is set. KASAN on 7.2.0-rc5 (arm64), single packet from an emulated device: BUG: KASAN: slab-out-of-bounds in snd_rawmidi_receive Read of size 255 at addr ffff000009f64682 by task bash/183 __asan_memcpy snd_rawmidi_receive usb6fire_midi_in_received [snd_usb_6fire] usb6fire_comm_receiver_handler [snd_usb_6fire] Allocated by task 11: usb6fire_comm_init [snd_usb_6fire] usb6fire_chip_probe [snd_usb_6fire] The buggy address is located 2 bytes inside of allocated 64-byte region [ffff000009f64680, ffff000009f646c0) Reject the event when the length exceeds the bytes that follow the header, and require the transfer to have delivered the header plus that many bytes. The receiver URB is submitted with a 64-byte transfer_buffer_length, so a genuine device cannot deliver an event longer than those 62 bytes and nothing valid is dropped. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Quelle: EUVD (ENISA), im Wortlaut der Meldung.

Produkte, die das Advisory nennt

Diese Angaben stammen aus der Meldung selbst, nicht aus einer Prüfung durch uns.

• Linux — Linux c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <466e911bbbbb779bb06337e35a286e5ca7af16b3; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5; 2.6.39; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <34816e2cfeabafb8eccf54687186ce25699e8363; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <a478893b59e36cfe7d77a76b352f2db55502e879; patch: 5.15.221; patch: 6.6.157; patch: 7.3-rc1; patch: 6.18.50; patch: 6.12.109; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <0c8a3c773823cf12abd39c480aed70e25c384630; patch: 7.2.4; patch: 5.10.270; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <2c590d5e1b1595d5c8fa0b72d2897423ce9985ca; patch: 0; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <c9204bc2ed2010e2469dbe5fce598878a37efd04; c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <00e84a9ff2d43953ae261995cae94d46f4c307a6; patch: 6.1.188

Die genannten Versionen sind die Angabe der Meldung. Patchlage vergleicht keine Versionsnummern und leitet aus ihnen keine Aussage ab — welche Version installiert ist, muss ein Mensch nachsehen.

Im Produktkatalog geführt

Für diese Produkte kann ein Bestand in Patchlage erfasst werden. Ein Advisory dazu erscheint am Morgen danach im Lagebericht.

• Linux — Linux

Patchlage meldet Treffer und Verdachtsfälle. Zu allem anderen sagt dieses System nichts — weder diese Seite noch der Lagebericht behauptet je, dass ein Bestand sicher ist.