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CVE-2026-46048

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : 7.0.2, <7.0.4, <7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b, 59b622a043cffc58b7638cd85ae6c30a0904f8e6, <21ca595aafa40d3ac70eab1f4cb62cc00ca21657, <6.18.27, <c874db8a1d2f9f08161470d00cfe8db2f5cca2cc, f6634af5de728a46792f674a66d7843570cb68f7, 6.18.25, 1d9be95aee6c6246a21752e60c9519902649f482, <da3b8fd6a202d94fef11a443abc9171c52426a1c, <6153878c5255bb69b7d0868105ca078ef13cbcf8, 493b3a682ededc804555755f5d2193201339612d, 6.6.136, <6.12.86, <a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a, 6473ed16df1fe88051140611b3eb9a49be7f429e, 6.12.84, ac7345f68cda6989016d85d63f7b244c064aa8f6, <6fa8dff64fb6c401ced40a05797b327659317498, <6.6.140, <50c6a1f05973f56d23280c9d7645a7a5734e0907, dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e, 80bb50e2d459213cccff3111d5ef98ed4238c0d5

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: fix usb_dev refcount leak on probe failure create_card() takes a reference on the USB device with usb_get_dev() and stores the matching usb_put_dev() in card_free(), which is installed as the snd_card's ->private_free destructor. However, ->private_free is only assigned near the end of init_card(), after several failure points (usb_set_interface(), EP type checks, usb_submit_urb(), the EP1_CMD_GET_DEVICE_INFO exchange, and its timeout). When any of those fail, init_card() returns an error to snd_probe(), which calls snd_card_free(card). Because ->private_free is still NULL, card_free() never runs, the usb_get_dev() reference is not dropped, and the struct usb_device leaks along with its descriptor allocations and device_private. syzbot reproduces this with a malformed UAC3 device whose only valid altsetting is 0; init_card()'s usb_set_interface(usb_dev, 0, 1) call fails with -EIO and triggers the leak. Move the ->private_free assignment into create_card(), immediately after usb_get_dev(), so that every error path reaching snd_card_free() balances the reference. card_free()'s callees (snd_usb_caiaq_input_free, free_urbs, kfree) already tolerate the partially-initialized state because the chip private area is zero-initialized by snd_card_new().

Gravité et risque d'exploitation

CVE-2026-46048 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 0.16 %, ce qui la place devant 5.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 7.0.2, <7.0.4, <7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b, 59b622a043cffc58b7638cd85ae6c30a0904f8e6, <21ca595aafa40d3ac70eab1f4cb62cc00ca21657, <6.18.27, <c874db8a1d2f9f08161470d00cfe8db2f5cca2cc, f6634af5de728a46792f674a66d7843570cb68f7, 6.18.25, 1d9be95aee6c6246a21752e60c9519902649f482, <da3b8fd6a202d94fef11a443abc9171c52426a1c, <6153878c5255bb69b7d0868105ca078ef13cbcf8, 493b3a682ededc804555755f5d2193201339612d, 6.6.136, <6.12.86, <a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a, 6473ed16df1fe88051140611b3eb9a49be7f429e, 6.12.84, ac7345f68cda6989016d85d63f7b244c064aa8f6, <6fa8dff64fb6c401ced40a05797b327659317498, <6.6.140, <50c6a1f05973f56d23280c9d7645a7a5734e0907, dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e, 80bb50e2d459213cccff3111d5ef98ed4238c0d5) 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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