CVE-2026-93097 (GCVE-0-2026-93097)
Vulnerability from cvelistv5
Published
2026-09-17 16:11
Modified
2026-10-19 09:05
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ed83f7ca398b3798b82c1d5d1113011c0e5a2198
Version: ed83f7ca398b3798b82c1d5d1113011c0e5a2198
Version: ed83f7ca398b3798b82c1d5d1113011c0e5a2198
Version: ed83f7ca398b3798b82c1d5d1113011c0e5a2198
Version: ed83f7ca398b3798b82c1d5d1113011c0e5a2198
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/mbox.c"
          ],
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "6.6.157",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
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              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mbox: Break poison list loop on an empty payload\n\nA device that returns count == 0 with CXL_POISON_FLAG_MORE set on every\niteration never advances nr_records, so the max_errors guard never\ntrips and the do/while loops forever while holding poison.mutex. That\nhangs the sysfs-triggered scan thread and blocks all subsequent poison\noperations on the device. The existing \"Protect against an uncleared\n_FLAG_MORE\" guard was intended to bound a misbehaving device but does\nnot cover the count == 0 case.\n\nStop the loop on an empty payload so a malfunctioning or malicious\ndevice cannot wedge the poison scan."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:05:30.426Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/86771c105293ca26bfcc320b4f60d32c137b54aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/42eab80981f4d2ac820e253e80ecf92f8cd91f69"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ad491cef1a812cf7b53aa769cd8869516c47362"
        },
        {
          "url": "https://git.kernel.org/stable/c/e77594e0cea67ab1c2317a27aa77a744e26ad6a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b301c4afbce4bc3f94528441d8d5ce1366504ad"
        }
      ],
      "title": "cxl/mbox: Break poison list loop on an empty payload",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93097",
    "datePublished": "2026-09-17T16:11:11.025Z",
    "dateReserved": "2026-09-17T16:02:15.084Z",
    "dateUpdated": "2026-10-19T09:05:30.426Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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