CVE-2026-80829: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-80829DEBIAN-CVE-2026-80829
Published 04-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-80829 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.7% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 2
MGASA-2026-0506OPENSUSE-SU-2026:11773-1SUSE-SU-2026:4687-1

Timeline

  1. 04-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output() snd_usbmidi_novation_output() lays out a two-byte header at transfer_buffer[0..1] and passes &transfer_buffer[2] together with a length of ep->max_transfer - 2 to snd_rawmidi_transmit(): count = snd_rawmidi_transmit(ep->ports[0].substream, &transfer_buffer[2], ep->max_transfer - 2); ep->max_transfer comes from the output endpoint's wMaxPacketSize via usb_maxpacket(). A malformed or malicious device can advertise a bulk OUT endpoint with a wMaxPacketSize of 1 - the USB core only clamps this value downwards - so ep->max_transfer becomes 1 and the count argument becomes -1. snd_rawmidi_transmit() passes the negative count on to __snd_rawmidi_transmit_peek(), where "if (count1 > count) count1 = count" leaves count1 negative; get_aligned_size() keeps it negative for a byte-stream substream, so the following memcpy(buffer, ..., count1) runs with a (size_t)-1 length and writes far past the transfer buffer, which was allocated with usb_alloc_coherent(ep->max_transfer). This is the same class of bug that was fixed for snd_usbmidi_akai_output() in commit 0970274613fb ("ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()"); the novation output routine was left unguarded. Bail out when the endpoint cannot hold the two-byte header plus at least one payload byte.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.19% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.111-1 | < 7.1.13-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 558fc4485ecc704edfe7876d6cebae4738ff7ef8 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9c8212436631b0063cb021e9f58df438e3db84d0 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e9c00d7533f99aa9833c4b598f47e3b3202fdb9a | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 94e4562fcc81badd1d467ddfb88c27e4fae974c2 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7f00dbddb51f4f74325cdc7c3f6b19fb3392481a | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1074c2306901b44ebcb83855583c6776e1e392ea | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1035a8f63bae28e498b0e7b5ac91d749844a7158 | 2.6.12

3 vendors · 172 products

References

14 links
Show all 14 references