{
  "cveId": "CVE-2023-46836",
  "url": "https://patchblox.com/security/cve/CVE-2023-46836",
  "summary": "CVE-2023-46836 is fixed in xen on 1 platform, first by DEBIAN-CVE-2023-46836, released January 5, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "xen: The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe",
  "description": "The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe.  It was believed that the mitigations always operated in contexts with IRQs disabled.  However, the original XSA-254 fix for Meltdown (XPTI) deliberately left interrupts enabled on two entry paths; one unconditionally, and one conditionally on whether XPTI was active.  As BTC/SRSO and Meltdown affect different CPU vendors, the mitigations are not active together by default.  Therefore, there is a race condition whereby a malicious PV guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen.",
  "published": "2024-01-05T17:15:11Z",
  "severity": "medium",
  "cvss": 4.7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
  "epss": 0.0025,
  "epssPercentile": 0.16396,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "4.17.2\u002B76-ge1f9cb16e2-1~deb12u1",
      "fix": "DEBIAN-CVE-2023-46836",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-46836",
      "released": "2024-01-05T17:15:11Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "4.17.2\u002B76-ge1f9cb16e2-1",
      "fix": "DEBIAN-CVE-2023-46836",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-46836",
      "released": "2024-01-05T17:15:11Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 14",
      "fixedVersion": "4.17.2\u002B76-ge1f9cb16e2-1",
      "fix": "DEBIAN-CVE-2023-46836",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-46836",
      "released": "2024-01-05T17:15:11Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}