PCI: Fix link speed calculation on retrain failure

{
  "id": "07cf3f6257b562e5f3b0c39b72c7174499d1f2d264eb63da2550dd377d41b69d",
  "url": "https://osv.dev/vulnerability/CVE-2025-39784",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PCI: Fix link speed calculation on retrain failure",
    "summary": "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't incorrectly return PCI_SPEED_UNKNOWN. [bhelgaas: commit log, add details from https://lore.kernel.org/r/1c92ef6bcb314ee6977839b46b393282e4f52e74.1750684771.git.lukas@wunner.de]",
    "evidence": "osv:CVE-2025-39784",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.16.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-39784",
      "aliases": [
        "CVE-2025-39784"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "de9a6c8d5dbfedb5eb3722c822da0490f6a59a45"
                },
                {
                  "fixed": "16557320f378262b5c605b15edebd3642406992a"
                },
                {
                  "fixed": "9989e0ca7462c62f93dbc62f684448aa2efb9226"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39784.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.16.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39784.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.110755113Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/16557320f378262b5c605b15edebd3642406992a",
        "https://git.kernel.org/stable/c/9989e0ca7462c62f93dbc62f684448aa2efb9226",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39784.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39784",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39784.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-39784",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494904,
  "published_at": "2025-09-11T16:56:34.097+00:00"
}