CVE-2026-72486

Description

In the Linux kernel, the following vulnerability has been resolved: mailbox: mtk-adsp: fix UAF during device teardown When the SOF audio driver fails to initialize (e.g. firmware boot timeout), its devres unwind frees the snd_sof_dev object that the mailbox client (mtk-adsp-ipc) reaches via chan->cl->rx_callback. The mtk-adsp-mailbox shutdown clears the mailbox command registers but leaves the IRQ line unmasked, so a late interrupt can still queue a threaded handler after mbox_free_channel() had cleared chan->cl, and mbox_chan_received_data() would then trigger UAF: BUG: KASAN: slab-use-after-free in sof_ipc3_validate_fw_version sof_ipc3_validate_fw_version sof_ipc3_do_rx_work sof_ipc3_rx_msg mt8196_dsp_handle_request mtk_adsp_ipc_recv mbox_chan_received_data mtk_adsp_mbox_isr irq_thread_fn Freed by task ...: kfree devres_release_all really_probe ... (sof-audio-of-mt8196 probe failure) The crash was observed roughly three seconds after the failed probe. disable_irq() in shutdown and enable_irq() in startup. disable_irq() also waits for any in-flight interrupts, so by the time mbox_free_channel() proceeds to clear chan->cl no rx_callback can run. In addition, request the IRQ with IRQF_NO_AUTOEN so it stays masked between probe and the first client bind — otherwise an early interrupt can crash on chan->cl == NULL in mbox_chan_received_data().

Gravité et risque d'exploitation

CVE-2026-72486 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 0.21 %, ce qui la place devant 11.1 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <7d881615fb6373f71fc628b3f00186aeca87a3d5, <=6.1.*, 6.18.40, <=6.12.*, 7.1.5, 5.18, 0, <25d6ea6c76e1b1b7c57337b2f8f1b6fc8d5c52bc, af2dfa96c52d042df5deb29fb6e32d3ff4d76a61, <=7.1.*, <5.18, 6.1.178, 6.12.97, <=6.6.*, <=6.18.*, <b57d1a40bc43258372fa1f4d39305e093947a262, 6.6.145, <e519c1d8c5efb5cd8d4c5bb3fe39b1bbb812bdb9, <=*, <fc6c3deb1d4c0adebf7dee0b8af4082af3f17690, <b6337a08a63eef8efcffe3c01d479badda6bbbdb, 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

• https://git.kernel.org/stable/c/b6337a08a63eef8efcffe3c01d479badda6bbbdb
• https://git.kernel.org/stable/c/e519c1d8c5efb5cd8d4c5bb3fe39b1bbb812bdb9
• https://git.kernel.org/stable/c/fc6c3deb1d4c0adebf7dee0b8af4082af3f17690
• https://git.kernel.org/stable/c/7d881615fb6373f71fc628b3f00186aeca87a3d5
• https://git.kernel.org/stable/c/25d6ea6c76e1b1b7c57337b2f8f1b6fc8d5c52bc
• https://git.kernel.org/stable/c/b57d1a40bc43258372fa1f4d39305e093947a262