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CVE-2026-89736

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <c74ff0b1a0fca53d3ac185873c87d6a719b30a47, <5.15.221, 4.19.280, 5.15.221, <79a92896e2bb9471550c56fc23d8d93592f04c27, 43ca70753dfffd517d2af126da28690f8f615605, 5.10.270, 0, <a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82, <6f46762196f04464e1050a9ee94e72b917db9010, 7.2.4, <891a8d11f4d5eb50b2ce7570f4f98204a7a57493, 6.1.188, 5.10.177, <6.3, 3256e152b645fc1e788ba44c2d8ced690113e3e6, <4.20, <=5.10.*, <=6.6.*, 6.6.157, 6.3, 6.2.9, <5.5, <=6.18.*, 4.14.312, 33f341c1fc60e172a3515c51bdabee11e83d1ee9, <f983793f03148b097977f200298db215cd2d4438, <5.10.270, 7.3, 3bc7324e4911351e39c54a62e6ca46321cb10faf, 6.1.22, <858965947081d10d41d9a1010a540d3d5eea958b, <=7.2.*, 3e016ef2e72da93a2ea7afbb45de1b481b44d761, 5.15.105, 5.4.240, <4e747c864a88537e18b1ffc19a1954c9686bb8e1, <=*, <=5.15.*, 0eda2004f38d95ef5715d62be884cd344260535b, 6.18.50, <4.15, <6.1.188, b131989797f7287d7fdadb2bababc05a15d44750, 6.12.109, 6c67ed9ad9b83e453e808f9b31a931a20a25629b

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_audio: Fix use-after-free on sound card disconnect g_audio_cleanup() invokes snd_card_free_when_closed() to initiate sound card teardown and immediately frees the underlying struct snd_uac_chip context. However, snd_card_free_when_closed() returns asynchronously while ALSA control elements (kctls) remain open in userspace. When userspace control applications access or close these open file descriptors, kctl callbacks attempt to dereference kctl->private_data pointing to &uac->c_prm or &uac->p_prm within the freed uac structure, resulting in a use-after-free (UAF) memory corruption. Fix this issue by deferring the destruction of struct snd_uac_chip until all references to the ALSA sound card are released. Register a custom card->private_free callback (u_audio_card_free) during g_audio_setup() that frees uac and its associated playback/capture request and ring buffers only when the sound card reference count drops to zero.

Gravité et risque d'exploitation

CVE-2026-89736 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.13 %, ce qui la place devant 2.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <c74ff0b1a0fca53d3ac185873c87d6a719b30a47, <5.15.221, 4.19.280, 5.15.221, <79a92896e2bb9471550c56fc23d8d93592f04c27, 43ca70753dfffd517d2af126da28690f8f615605, 5.10.270, 0, <a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82, <6f46762196f04464e1050a9ee94e72b917db9010, 7.2.4, <891a8d11f4d5eb50b2ce7570f4f98204a7a57493, 6.1.188, 5.10.177, <6.3, 3256e152b645fc1e788ba44c2d8ced690113e3e6, <4.20, <=5.10.*, <=6.6.*, 6.6.157, 6.3, 6.2.9, <5.5, <=6.18.*, 4.14.312, 33f341c1fc60e172a3515c51bdabee11e83d1ee9, <f983793f03148b097977f200298db215cd2d4438, <5.10.270, 7.3, 3bc7324e4911351e39c54a62e6ca46321cb10faf, 6.1.22, <858965947081d10d41d9a1010a540d3d5eea958b, <=7.2.*, 3e016ef2e72da93a2ea7afbb45de1b481b44d761, 5.15.105, 5.4.240, <4e747c864a88537e18b1ffc19a1954c9686bb8e1, <=*, <=5.15.*, 0eda2004f38d95ef5715d62be884cd344260535b, 6.18.50, <4.15, <6.1.188, b131989797f7287d7fdadb2bababc05a15d44750, 6.12.109, 6c67ed9ad9b83e453e808f9b31a931a20a25629b) 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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