{
  "cveId": "CVE-2026-93238",
  "url": "https://patchblox.com/security/cve/CVE-2026-93238",
  "summary": "CVE-2026-93238 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-93238, released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap  The DECLARE_BITMAP(apm_filtered, AP_DEVICES) macro allocates the bitmap on the stack without zero-initializing it.  In vfio_ap_mdev_hot_plug_cfg(), the vfio_ap_mdev_filter_matrix() function is only called to initialize and populate apm_filtered if either filter_adapters or filter_domains is true. If the hot plug configuration change only adds control domains (meaning filter_cdoms is true, but filter_adapters and filter_domains are both false), vfio_ap_mdev_filter_matrix() is bypassed.  Consequently, apm_filtered is passed to reset_queues_for_apids() with uninitialized stack garbage. This can cause reset_queues_for_apids() to interpret arbitrary stack garbage bits as valid APIDs to reset, potentially performing unintended guest hardware queue resets.  Fix this by zero-initializing the apm_filtered bitmap at the beginning of vfio_ap_mdev_hot_plug_cfg() using bitmap_zero().",
  "published": "2026-09-24T16:17:19Z",
  "severity": "Low",
  "cvss": 3.9,
  "epss": 0.0021,
  "epssPercentile": 0.11273,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93238",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-93238",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93238",
      "released": "2026-09-24T19:30:44Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-93238",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93238",
      "released": "2026-09-24T19:30:44Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-93238",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93238",
      "released": "2026-09-24T19:30:44Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}