CVE-2026-64528

Description

In the Linux kernel, the following vulnerability has been resolved: tty: serial: samsung: Remove redundant port lock acquisition in rx helpers Sashiko identified a deadlock when the console flow is engaged [1]. When console flow control is enabled (UPF_CONS_FLOW), s3c24xx_serial_stop_tx() calls s3c24xx_serial_rx_enable() and s3c24xx_serial_start_tx() calls s3c24xx_serial_rx_disable(). The serial core framework invokes the .stop_tx() and .start_tx() callbacks with the port->lock spinlock already held. Furthermore, all internal driver paths that invoke stop_tx (such as the DMA TX completion handler s3c24xx_serial_tx_dma_complete() or the PIO TX IRQ handler s3c24xx_serial_tx_irq()) also acquire port->lock prior to calling it. (Note that s3c24xx_serial_start_tx() is only invoked by the serial core). However, s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable() unconditionally attempt to acquire port->lock again using uart_port_lock_irqsave(). Since spinlocks are not recursive, this causes a deadlock on the same CPU when console flow control is engaged. Remove the redundant lock acquisition from both rx helper functions.

Gravité et risque d'exploitation

CVE-2026-64528 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 0.17 %, ce qui la place devant 5.7 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <=7.0.*, <f4c3e63fa8639aedf96fb200d9939945a9eed51e, <=6.12.*, <14143ec10d69f42806b5d7b046f0fd1b835831ae, 6.12.93, 0, b497549a035c2a81b71c7a27f2b00c8a16c09423, 6.18.35, <2.6.27, 6.1.176, <9fd48937046efc9abb89379d63ee9cc5c661d711, 5.15.210, <=5.10.*, <=6.6.*, 7.1, <=6.18.*, <9c92b42207978559e32903c3098aaf5c5b5788b2, <a3bb136bff5e6a5e48cdd813246c9c4686feaaa9, <10014eb7eee351f7b587f8ac85830f0c9343cb9a, 7.0.12, <=*, <=5.15.*, 6.6.143, 2.6.27, <ee9eb72be95490602c493db050c73d925c3a4d74, <a9c22e0f93ba18322a6623ecdda2f0cd858ca350, 5.10.259) 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/ee9eb72be95490602c493db050c73d925c3a4d74
• https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a
• https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e
• https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350
• https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae
• https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711
• https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2
• https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9