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CVE-2026-80829

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 2.6.12, 6.6.156, 5.10.269, 0, <=7.1.*, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, <=5.10.*, <9c8212436631b0063cb021e9f58df438e3db84d0, <=6.6.*, <1035a8f63bae28e498b0e7b5ac91d749844a7158, <94e4562fcc81badd1d467ddfb88c27e4fae974c2, <7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870, <e9c00d7533f99aa9833c4b598f47e3b3202fdb9a, <1074c2306901b44ebcb83855583c6776e1e392ea, <=6.18.*, <7f00dbddb51f4f74325cdc7c3f6b19fb3392481a, <91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c, <=7.2.*, <558fc4485ecc704edfe7876d6cebae4738ff7ef8, 5.15.220, 7.1.13, 6.18.49, <=*, <=5.15.*, 6.12.108, 6.1.187, 7.2.3, 7.3

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.

Gravité et risque d'exploitation

CVE-2026-80829 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.19 %, ce qui la place devant 8.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 2.6.12, 6.6.156, 5.10.269, 0, <=7.1.*, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, <=5.10.*, <9c8212436631b0063cb021e9f58df438e3db84d0, <=6.6.*, <1035a8f63bae28e498b0e7b5ac91d749844a7158, <94e4562fcc81badd1d467ddfb88c27e4fae974c2, <7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870, <e9c00d7533f99aa9833c4b598f47e3b3202fdb9a, <1074c2306901b44ebcb83855583c6776e1e392ea, <=6.18.*, <7f00dbddb51f4f74325cdc7c3f6b19fb3392481a, <91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c, <=7.2.*, <558fc4485ecc704edfe7876d6cebae4738ff7ef8, 5.15.220, 7.1.13, 6.18.49, <=*, <=5.15.*, 6.12.108, 6.1.187, 7.2.3, 7.3) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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