cxl/mbox: Break poison list loop on an empty payload

{
  "id": "06c6d508c2aa1caa696d3ca27ba751796bc9cc9a5842b8b9eb4664d8bfd91d66",
  "url": "https://osv.dev/vulnerability/CVE-2026-93097",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cxl/mbox: Break poison list loop on an empty payload",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cxl/mbox: Break poison list loop on an empty payload A device that returns count == 0 with CXL_POISON_FLAG_MORE set on every iteration never advances nr_records, so the max_errors guard never trips and the do/while loops forever while holding poison.mutex. That hangs the sysfs-triggered scan thread and blocks all subsequent poison operations on the device. The existing \"Protect against an uncleared _FLAG_MORE\" guard was intended to bound a misbehaving device but does not cover the count == 0 case. Stop the loop on an empty payload so a malfunctioning or malicious device cannot wedge the poison scan.",
    "evidence": "osv:CVE-2026-93097",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-93097",
      "aliases": [
        "CVE-2026-93097"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ed83f7ca398b3798b82c1d5d1113011c0e5a2198"
                },
                {
                  "fixed": "86771c105293ca26bfcc320b4f60d32c137b54aa"
                },
                {
                  "fixed": "42eab80981f4d2ac820e253e80ecf92f8cd91f69"
                },
                {
                  "fixed": "6ad491cef1a812cf7b53aa769cd8869516c47362"
                },
                {
                  "fixed": "e77594e0cea67ab1c2317a27aa77a744e26ad6a6"
                },
                {
                  "fixed": "8b301c4afbce4bc3f94528441d8d5ce1366504ad"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93097.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.52"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93097.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.648978001Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/42eab80981f4d2ac820e253e80ecf92f8cd91f69",
        "https://git.kernel.org/stable/c/6ad491cef1a812cf7b53aa769cd8869516c47362",
        "https://git.kernel.org/stable/c/86771c105293ca26bfcc320b4f60d32c137b54aa",
        "https://git.kernel.org/stable/c/8b301c4afbce4bc3f94528441d8d5ce1366504ad",
        "https://git.kernel.org/stable/c/e77594e0cea67ab1c2317a27aa77a744e26ad6a6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93097.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93097",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93097.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93097",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499749,
  "published_at": "2026-09-17T16:11:11.025+00:00"
}