FKIE_CVE-2026-64528

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-25 10:17
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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-\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."
    }
  ],
  "id": "CVE-2026-64528",
  "lastModified": "2026-07-25T10:17:39.187",
  "metrics": {},
  "published": "2026-07-25T10:17:39.187",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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