- —Not scoredno CVSS score yet
- 0.22%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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 <[email protected]>
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.22% · top 88% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 – < c9204bc2ed2010e2469dbe5fce598878a37efd04
- affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 – < 2c590d5e1b1595d5c8fa0b72d2897423ce9985ca
- affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 – < 0c8a3c773823cf12abd39c480aed70e25c384630
- affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 – < 00e84a9ff2d43953ae261995cae94d46f4c307a6
- affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 – < 466e911bbbbb779bb06337e35a286e5ca7af16b3
- affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 – < 2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5
- affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 – < 34816e2cfeabafb8eccf54687186ce25699e8363
- affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 – < a478893b59e36cfe7d77a76b352f2db55502e879
- affected 2.6.39
- unaffected < 2.6.39
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/c9204bc2ed2010e2469dbe5fce598878a37efd04 (opens in a new tab)
- https://git.kernel.org/stable/c/2c590d5e1b1595d5c8fa0b72d2897423ce9985ca (opens in a new tab)
- https://git.kernel.org/stable/c/0c8a3c773823cf12abd39c480aed70e25c384630 (opens in a new tab)
- https://git.kernel.org/stable/c/00e84a9ff2d43953ae261995cae94d46f4c307a6 (opens in a new tab)
- https://git.kernel.org/stable/c/466e911bbbbb779bb06337e35a286e5ca7af16b3 (opens in a new tab)
- https://git.kernel.org/stable/c/2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5 (opens in a new tab)
- https://git.kernel.org/stable/c/34816e2cfeabafb8eccf54687186ce25699e8363 (opens in a new tab)
- https://git.kernel.org/stable/c/a478893b59e36cfe7d77a76b352f2db55502e879 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76296 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80973)Record last updated .