{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64528",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-64528"
  ],
  "published": "2026-07-25T09:19:40Z",
  "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->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.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.176",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64528"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-07-25T09:19:40Z"
  }
}