{
  "cveId": "CVE-2026-43364",
  "url": "https://patchblox.com/security/cve/CVE-2026-43364",
  "summary": "CVE-2026-43364 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43364 (version 6.19.10-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ublk: fix NULL pointer dereference in ublk_ctrl_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ublk: fix NULL pointer dereference in ublk_ctrl_set_size()  ublk_ctrl_set_size() unconditionally dereferences ub-\u003Eub_disk via set_capacity_and_notify() without checking if it is NULL.  ub-\u003Eub_disk is NULL before UBLK_CMD_START_DEV completes (it is only assigned in ublk_ctrl_start_dev()) and after UBLK_CMD_STOP_DEV runs (ublk_detach_disk() sets it to NULL). Since the UBLK_CMD_UPDATE_SIZE handler performs no state validation, a user can trigger a NULL pointer dereference by sending UPDATE_SIZE to a device that has been added but not yet started, or one that has been stopped.  Fix this by checking ub-\u003Eub_disk under ub-\u003Emutex before dereferencing it, and returning -ENODEV if the disk is not available.",
  "published": "2026-05-08T15:16:47Z",
  "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": 0.00121,
  "epssPercentile": 0.01903,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.10-1",
      "fix": "DEBIAN-CVE-2026-43364",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43364",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}