{"id":"CVE-2026-64528","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-64528","generatedAt":"2026-10-28T07:04:42.265Z","title":"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].","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: samsung: Remove redundant port lock acquisition in rx helpers\n\nSashiko identified a deadlock when the console flow is engaged [1].\n\nWhen console flow control is enabled (UPF_CONS_FLOW),\ns3c24xx_serial_stop_tx() calls s3c24xx_serial_rx_enable() and\ns3c24xx_serial_start_tx() calls s3c24xx_serial_rx_disable().\n\nThe serial core framework invokes the .stop_tx() and .start_tx()\ncallbacks with the port->lock spinlock already held. Furthermore, all\ninternal driver paths that invoke stop_tx (such as the DMA TX\ncompletion handler s3c24xx_serial_tx_dma_complete() or the PIO TX IRQ\nhandler s3c24xx_serial_tx_irq()) also acquire port->lock prior to\ncalling it. (Note that s3c24xx_serial_start_tx() is only invoked by the\nserial core).\n\nHowever, s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable()\nunconditionally attempt to acquire port->lock again using\nuart_port_lock_irqsave(). Since spinlocks are not recursive, this\ncauses a deadlock on the same CPU when console flow control is engaged.\n\nRemove the redundant lock acquisition from both rx helper functions.","published":"2026-07-25T10:17:39.000Z","lastModified":"2026-07-25T10:17:39.000Z","status":"Received","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":null,"cwe":[],"affected":[],"epss":{"score":0.00168,"percentile":0.0608,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"unknown","text":"Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64528","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}