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CVE-2026-97931

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.0 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 7.2.7, <cbc1f954ce67d739d41d1f0757d29850353ebb6a, 6.18.53, 0, <64a87950239867682cde128020e1a47088295e5c, 2.6.28, 030a07e441296c372f946cd4065b5d831d8dc40c, <6a5f5a5a32c78e67701f1d0f26bc87af68895604, <0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, <becb89036a1320ef0a77da2d27935ac0704345c4, 6.1.189, <2.6.28, <938e8d6cee8d36f24669dfdcd3717e081eb32d64, <=6.18.*, 5.15.222, <=7.2.*, <=*, <=5.15.*, <71c610aeb1770302ac9c9e0b9a4ecd37f1311928, <d9c537b14f4982f17b103e3a2cfeee4bee6bc026, 6.12.111, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Prevent write upgrades for read mappings The hwdep mmap callback rejects read-buffer mappings that are initially writable, but leaves VM_MAYWRITE set on mappings created with PROT_READ. A process that can open the hwdep node O_RDWR can later use mprotect() to make the mapping writable. The read allocation begins with struct usb_stream. Its read_size member is used by the fault handler to decide which pages belong to the read buffer. The read VMA intentionally remains expandable because pcm_usb_stream uses mremap() after reading that size. Changing read_size first can therefore map and access pages beyond the allocation. The same member is also consumed by usb_stream_free(), where changing it can make free_pages_exact() release pages outside the allocation. Clear VM_MAYWRITE for read-buffer mappings after rejecting an initially writable VMA. This keeps the separate output-buffer mapping writable while preventing later permission upgrades.

Gravité et risque d'exploitation

CVE-2026-97931 obtient un score CVSS de 7.0/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.14 %, ce qui la place devant 3.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 7.2.7, <cbc1f954ce67d739d41d1f0757d29850353ebb6a, 6.18.53, 0, <64a87950239867682cde128020e1a47088295e5c, 2.6.28, 030a07e441296c372f946cd4065b5d831d8dc40c, <6a5f5a5a32c78e67701f1d0f26bc87af68895604, <0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, <becb89036a1320ef0a77da2d27935ac0704345c4, 6.1.189, <2.6.28, <938e8d6cee8d36f24669dfdcd3717e081eb32d64, <=6.18.*, 5.15.222, <=7.2.*, <=*, <=5.15.*, <71c610aeb1770302ac9c9e0b9a4ecd37f1311928, <d9c537b14f4982f17b103e3a2cfeee4bee6bc026, 6.12.111, 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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