{
  "cveId": "CVE-2026-89795",
  "url": "https://patchblox.com/security/cve/CVE-2026-89795",
  "summary": "CVE-2026-89795 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89795, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "PCI: Allow per function PCI slots to fix slot reset on s390",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  PCI: Allow per function PCI slots to fix slot reset on s390  On s390 systems, which use a machine level hypervisor, PCI devices are always accessed through a form of PCI pass-through which fundamentally operates on a per PCI function granularity. This is also reflected in the s390 PCI hotplug driver which creates hotplug slots for individual PCI functions. Its reset_slot() function, which is a wrapper for zpci_hot_reset_device(), thus also resets individual functions.  Currently, the pci_create_slot() assigns the same pci_slot object to multifunction devices. This approach worked fine on s390 systems that only exposed virtual functions as individual PCI domains to the operating system.  Since commit 44510d6fa0c0 (\u0022s390/pci: Handling multifunctions\u0022) s390 supports exposing the topology of multifunction PCI devices by grouping them in a shared PCI domain. This creates a problem when resetting a function through the hotplug driver\u0027s slot_reset() interface.  When attempting to reset a function through the hotplug driver, the shared slot assignment causes the wrong function to be reset instead of the intended one. It also leaks memory as we do create a pci_slot object for the function, but don\u0027t correctly free it in pci_slot_release().  Add a flag for struct pci_slot to allow per function PCI slots for functions managed through a hypervisor, which exposes individual PCI functions while retaining the topology. Since we can use all 8 bits for slot \u0027number\u0027 (for ARI devices), change slot \u0027number\u0027 u16 to account for special values PCI_SLOT_PLACEHOLDER and PCI_SLOT_ALL_DEVICES.",
  "published": "2026-09-16T11:16:44Z",
  "severity": "Important",
  "cvss": 8.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H",
  "epss": 0.00165,
  "epssPercentile": 0.05743,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89795",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-89795",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89795",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89795",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89795",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.113-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-89795",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89795",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "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"
  }
}