{"id":"CVE-2026-64528","summary":"tty: serial: samsung: Remove redundant port lock acquisition in rx helpers","details":"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-\u003elock 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-\u003elock 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-\u003elock 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.","modified":"2026-07-27T04:03:23.153929896Z","published":"2026-07-25T09:20:51.774Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64528.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64528.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64528"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b497549a035c2a81b71c7a27f2b00c8a16c09423"},{"fixed":"ee9eb72be95490602c493db050c73d925c3a4d74"},{"fixed":"10014eb7eee351f7b587f8ac85830f0c9343cb9a"},{"fixed":"f4c3e63fa8639aedf96fb200d9939945a9eed51e"},{"fixed":"a9c22e0f93ba18322a6623ecdda2f0cd858ca350"},{"fixed":"14143ec10d69f42806b5d7b046f0fd1b835831ae"},{"fixed":"9fd48937046efc9abb89379d63ee9cc5c661d711"},{"fixed":"9c92b42207978559e32903c3098aaf5c5b5788b2"},{"fixed":"a3bb136bff5e6a5e48cdd813246c9c4686feaaa9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64528.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.27"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64528.json"}}],"schema_version":"1.7.5"}