{"api_version":"1","generated_at":"2026-07-27T05:18:44+00:00","cve":"CVE-2026-64528","urls":{"html":"https://cve.report/CVE-2026-64528","api":"https://cve.report/api/cve/CVE-2026-64528.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64528","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64528"},"summary":{"title":"tty: serial: samsung: Remove redundant port lock acquisition in rx helpers","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:39","updated_at":"2026-07-25 10:17:39"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae","name":"https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2","name":"https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350","name":"https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9","name":"https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74","name":"https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e","name":"https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711","name":"https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a","name":"https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64528","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64528","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b497549a035c2a81b71c7a27f2b00c8a16c09423 ee9eb72be95490602c493db050c73d925c3a4d74 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b497549a035c2a81b71c7a27f2b00c8a16c09423 10014eb7eee351f7b587f8ac85830f0c9343cb9a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b497549a035c2a81b71c7a27f2b00c8a16c09423 f4c3e63fa8639aedf96fb200d9939945a9eed51e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b497549a035c2a81b71c7a27f2b00c8a16c09423 a9c22e0f93ba18322a6623ecdda2f0cd858ca350 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64528","cve":"CVE-2026-64528","epss":"0.001680000","percentile":"0.064010000","score_date":"2026-07-26","updated_at":"2026-07-27 00:02:02"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/tty/serial/samsung_tty.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ee9eb72be95490602c493db050c73d925c3a4d74","status":"affected","version":"b497549a035c2a81b71c7a27f2b00c8a16c09423","versionType":"git"},{"lessThan":"10014eb7eee351f7b587f8ac85830f0c9343cb9a","status":"affected","version":"b497549a035c2a81b71c7a27f2b00c8a16c09423","versionType":"git"},{"lessThan":"f4c3e63fa8639aedf96fb200d9939945a9eed51e","status":"affected","version":"b497549a035c2a81b71c7a27f2b00c8a16c09423","versionType":"git"},{"lessThan":"a9c22e0f93ba18322a6623ecdda2f0cd858ca350","status":"affected","version":"b497549a035c2a81b71c7a27f2b00c8a16c09423","versionType":"git"},{"lessThan":"14143ec10d69f42806b5d7b046f0fd1b835831ae","status":"affected","version":"b497549a035c2a81b71c7a27f2b00c8a16c09423","versionType":"git"},{"lessThan":"9fd48937046efc9abb89379d63ee9cc5c661d711","status":"affected","version":"b497549a035c2a81b71c7a27f2b00c8a16c09423","versionType":"git"},{"lessThan":"9c92b42207978559e32903c3098aaf5c5b5788b2","status":"affected","version":"b497549a035c2a81b71c7a27f2b00c8a16c09423","versionType":"git"},{"lessThan":"a3bb136bff5e6a5e48cdd813246c9c4686feaaa9","status":"affected","version":"b497549a035c2a81b71c7a27f2b00c8a16c09423","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/tty/serial/samsung_tty.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.27"},{"lessThan":"2.6.27","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"2.6.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"2.6.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"2.6.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"2.6.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"2.6.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.35","versionStartIncluding":"2.6.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.12","versionStartIncluding":"2.6.27","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"2.6.27","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-07-25T09:20:51.774Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74"},{"url":"https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a"},{"url":"https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e"},{"url":"https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350"},{"url":"https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae"},{"url":"https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711"},{"url":"https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2"},{"url":"https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9"}],"title":"tty: serial: samsung: Remove redundant port lock acquisition in rx helpers","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64528","datePublished":"2026-07-25T09:20:51.774Z","dateReserved":"2026-07-19T15:36:31.794Z","dateUpdated":"2026-07-25T09:20:51.774Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:39","lastModifiedDate":"2026-07-25 10:17:39","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64528","Ordinal":"1","Title":"tty: serial: samsung: Remove redundant port lock acquisition in ","CVE":"CVE-2026-64528","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64528","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"tty: serial: samsung: Remove redundant port lock acquisition in "}]}}}