xen — security advisory

{
  "id": "e36b3ea913afb95f17d08c1af8a0c6b656c33cba85451c1e6158ba4c9b849954",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2023-46836",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2023-46836",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2023-46836",
    "products": [
      {
        "name": {
          "value": "xen",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.17.2+76-ge1f9cb16e2-1~deb12u1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "4.17.1+2-gb773c48e36-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.17.2+55-g0b56bed864-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.17.2-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "xen",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.17.2+76-ge1f9cb16e2-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "xen",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.17.2+76-ge1f9cb16e2-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2023-46836",
      "aliases": [
        "DEBIAN-CVE-2023-46836"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.17.2+76-ge1f9cb16e2-1~deb12u1"
                }
              ]
            }
          ],
          "package": {
            "name": "xen",
            "purl": "pkg:deb/debian/xen?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "4.17.1+2-gb773c48e36-1",
            "4.17.2+55-g0b56bed864-1",
            "4.17.2-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-46836.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.17.2+76-ge1f9cb16e2-1"
                }
              ]
            }
          ],
          "package": {
            "name": "xen",
            "purl": "pkg:deb/debian/xen?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-46836.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.17.2+76-ge1f9cb16e2-1"
                }
              ]
            }
          ],
          "package": {
            "name": "xen",
            "purl": "pkg:deb/debian/xen?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-46836.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T18:02:49.689945458Z",
      "provider": "osv",
      "upstream": [
        "CVE-2023-46836"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2023-46836"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2023-46836",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 456934,
  "published_at": "2024-01-05T17:15:11.197+00:00"
}