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CVE-2026-64479

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : d7e2ce72833bb23a82b4201fbed7214cc04a4a8c, <=6.12.*, 46397622a3fa8372b8fda0f04b33d16923b03b1b, <fb1aa5082847b98f44f9c6272aee9d0dca9244f0, 6.18.39, <6.5, <435990e25bf1f4af3e6df12a6fbfd1f7ba4a97d4, 0, <=7.1.*, 7.1.4, <651ba82fe2a144bc7356d940bfd235c3810b0549, 6.5, <=6.6.*, <a224c84e5d3d35708c082c84ad12d81d90762195, <ea672a9f6cc38f06fe69dd2c257ef8a3d4db179a, 6389f2c135311c4ce7c08c3b29145c8f95aacf1f, <=6.18.*, 6.6.145, <d7649aa11089a93ea2285c210397aa67e5800766, <=*, <6ded42615fa1f4949925afd0a8a9e1ab3bf96202, 6.12.96, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup() snd_seq_event_dup() copies an incoming event into a pool cell and, in the UMP-enabled build, clears the trailing cell->ump.raw.extra word that the memcpy() did not cover. The guard deciding whether to clear it compares the copied size against sizeof(cell->event): memcpy(&cell->ump, event, size); if (size < sizeof(cell->event)) cell->ump.raw.extra = 0; For a legacy (non-UMP) event, size == sizeof(struct snd_seq_event) == sizeof(cell->event), so the condition is false and the extra word keeps stale data. The cell pool is allocated with kvmalloc() (not zeroed) and cells are reused via a free list, so that word holds uninitialised heap or leftover event data. When such a cell is delivered to a UMP client (client->midi_version > 0) that set SNDRV_SEQ_FILTER_NO_CONVERT -- so the legacy event reaches it unconverted -- snd_seq_read() reads it out as the larger struct snd_seq_ump_event and copies the stale word to user space, a 4-byte kernel heap infoleak to an unprivileged /dev/snd/seq client. Compare against sizeof(cell->ump) instead, so the trailing word is zeroed for every event shorter than the UMP cell.

Gravité et risque d'exploitation

CVE-2026-64479 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 0.18 %, ce qui la place devant 7.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions d7e2ce72833bb23a82b4201fbed7214cc04a4a8c, <=6.12.*, 46397622a3fa8372b8fda0f04b33d16923b03b1b, <fb1aa5082847b98f44f9c6272aee9d0dca9244f0, 6.18.39, <6.5, <435990e25bf1f4af3e6df12a6fbfd1f7ba4a97d4, 0, <=7.1.*, 7.1.4, <651ba82fe2a144bc7356d940bfd235c3810b0549, 6.5, <=6.6.*, <a224c84e5d3d35708c082c84ad12d81d90762195, <ea672a9f6cc38f06fe69dd2c257ef8a3d4db179a, 6389f2c135311c4ce7c08c3b29145c8f95aacf1f, <=6.18.*, 6.6.145, <d7649aa11089a93ea2285c210397aa67e5800766, <=*, <6ded42615fa1f4949925afd0a8a9e1ab3bf96202, 6.12.96, 7.2) 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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