{
  "cveId": "CVE-2025-39784",
  "url": "https://patchblox.com/security/cve/CVE-2025-39784",
  "summary": "CVE-2025-39784 is fixed in linux on 1 platform by DEBIAN-CVE-2025-39784 (version 6.16.5-1), released September 11, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  PCI: Fix link speed calculation on retrain failu...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  PCI: Fix link speed calculation on retrain failure  When pcie_failed_link_retrain() fails to retrain, it tries to revert to the previous link speed.  However it calculates that speed from the Link Control 2 register without masking out non-speed bits first.  PCIE_LNKCTL2_TLS2SPEED() converts such incorrect values to PCI_SPEED_UNKNOWN (0xff), which in turn causes a WARN splat in pcie_set_target_speed():    pci 0000:00:01.1: [1022:14ed] type 01 class 0x060400 PCIe Root Port   pci 0000:00:01.1: broken device, retraining non-functional downstream link at 2.5GT/s   pci 0000:00:01.1: retraining failed   WARNING: CPU: 1 PID: 1 at drivers/pci/pcie/bwctrl.c:168 pcie_set_target_speed   RDX: 0000000000000001 RSI: 00000000000000ff RDI: ffff9acd82efa000   pcie_failed_link_retrain   pci_device_add   pci_scan_single_device  Mask out the non-speed bits in PCIE_LNKCTL2_TLS2SPEED() and PCIE_LNKCAP_SLS2SPEED() so they don\u0027t incorrectly return PCI_SPEED_UNKNOWN.  [bhelgaas: commit log, add details from https://lore.kernel.org/r/1c92ef6bcb314ee6977839b46b393282e4f52e74.1750684771.git.lukas@wunner.de]",
  "published": "2025-09-11T17:15:44Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0013,
  "epssPercentile": 0.02675,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.5-1",
      "fix": "DEBIAN-CVE-2025-39784",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39784",
      "released": "2025-09-11T17:15:44Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}