CVE-2026-43459

Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: soc-core: flush delayed work before removing DAIs and widgets When a sound card is unbound while a PCM stream is open, a use-after-free can occur in snd_soc_dapm_stream_event(), called from the close_delayed_work workqueue handler. During unbind, snd_soc_unbind_card() flushes delayed work and then calls soc_cleanup_card_resources(). Inside cleanup, snd_card_disconnect_sync() releases all PCM file descriptors, and the resulting PCM close path can call snd_soc_dapm_stream_stop() which schedules new delayed work with a pmdown_time timer delay. Since this happens after the flush in snd_soc_unbind_card(), the new work is not caught. soc_remove_link_components() then frees DAPM widgets before this work fires, leading to the use-after-free. The existing flush in soc_free_pcm_runtime() also cannot help as it runs after soc_remove_link_components() has already freed the widgets. Add a flush in soc_cleanup_card_resources() after snd_card_disconnect_sync() (after which no new PCM closes can schedule further delayed work) and before soc_remove_link_dais() and soc_remove_link_components() (which tear down the structures the delayed work accesses).

Gravité et risque d'exploitation

CVE-2026-43459 obtient un score CVSS de 7.3/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.4 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <bf80a89da97285d9b877e0c6995e870d46b8025c, e894efef9ac7c10b7727798dcc711cccf07569f9, <=6.1.*, <=6.12.*, <eab71e11ce2447c1e01809cbc11eab4234cf8dc8, <231568afbc0cd25b8fb2a94ebf9738eabe1cf007, 6.12.78, <317a9298c54bb00319da73e5a7179f00e67fcbdf, 4.20, 0, 7.0, <95bc5c225513fc3c4ce169563fb5e3929fbb938b, <4.20, 6.18.19, <=5.10.*, <=6.6.*, <=6.19.*, <3887e514978d28216246360b46a9cb534969eb5a, 5.15.203, 6.19.9, <c054f0607c8bb1b1aa529bc109e4149298a1cccd, <=6.18.*, 6.1.167, <=*, 5.10.253, <=5.15.*, 6.6.130, <7d33e6140945482a07f8089ee86e13e02553ffdb) 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

• https://git.kernel.org/stable/c/bf80a89da97285d9b877e0c6995e870d46b8025c
• https://git.kernel.org/stable/c/3887e514978d28216246360b46a9cb534969eb5a
• https://git.kernel.org/stable/c/231568afbc0cd25b8fb2a94ebf9738eabe1cf007
• https://git.kernel.org/stable/c/317a9298c54bb00319da73e5a7179f00e67fcbdf
• https://git.kernel.org/stable/c/eab71e11ce2447c1e01809cbc11eab4234cf8dc8
• https://git.kernel.org/stable/c/7d33e6140945482a07f8089ee86e13e02553ffdb
• https://git.kernel.org/stable/c/c054f0607c8bb1b1aa529bc109e4149298a1cccd
• https://git.kernel.org/stable/c/95bc5c225513fc3c4ce169563fb5e3929fbb938b