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  "vulnerabilities": [
    {
      "cve": "CVE-2025-21820",
      "cwe": {
        "id": "CWE-667",
        "name": "Improper Locking"
      },
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: xilinx_uartps: split sysrq handling\n\nlockdep detects the following circular locking dependency:\n\nCPU 0                      CPU 1\n========================== ============================\ncdns_uart_isr()            printk()\n  uart_port_lock(port)       console_lock()\n\t\t\t     cdns_uart_console_write()\n                               if (!port->sysrq)\n                                 uart_port_lock(port)\n  uart_handle_break()\n    port->sysrq = ...\n  uart_handle_sysrq_char()\n    printk()\n      console_lock()\n\nThe fixed commit attempts to avoid this situation by only taking the\nport lock in cdns_uart_console_write if port->sysrq unset. However, if\n(as shown above) cdns_uart_console_write runs before port->sysrq is set,\nthen it will try to take the port lock anyway. This may result in a\ndeadlock.\n\nFix this by splitting sysrq handling into two parts. We use the prepare\nhelper under the port lock and defer handling until we release the lock.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2025-21820"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/4410dba9807a17a93f649a9f5870ceaf30a675a3",
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        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b06f388994500297bb91be60ffaf6825ecfd2afe",
          "url": "https://git.kernel.org/stable/c/b06f388994500297bb91be60ffaf6825ecfd2afe"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/de5bd24197bd9ee37ec1e379a3d882bbd15c5065",
          "url": "https://git.kernel.org/stable/c/de5bd24197bd9ee37ec1e379a3d882bbd15c5065"
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          "summary": "https://git.kernel.org/stable/c/e22a97700901ba5e8bf8db68056a0d50f9440cae",
          "url": "https://git.kernel.org/stable/c/e22a97700901ba5e8bf8db68056a0d50f9440cae"
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          "summary": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
        }
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      "release_date": "2025-02-27T20:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "details": "This is a local deadlock in the Xilinx/Cadence PS UART driver’s Magic SysRq path that only impacts availability, with no confidentiality or integrity effect. It is reachable only on systems using Xilinx Zynq/Versal-class SoCs where the xilinx_uartps/cdns_uart console is active and the kernel is built with MAGIC_SYSRQ and SERIAL_XILINX_PS_UART_CONSOLE—conditions not present on standard x86_64 servers or cloud VMs. Given the local attack vector and these narrow hardware/build prerequisites, it can be safely deprioritized for enterprise VM and server fleets.",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          "category": "impact",
          "details": "Moderate"
        }
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    }
  ]
}