CVE-2026-43171 (GCVE-0-2026-43171)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-05-11 22:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: EFI/CPER: don't dump the entire memory region The current logic at cper_print_fw_err() doesn't check if the error record length is big enough to handle offset. On a bad firmware, if the ofset is above the actual record, length -= offset will underflow, making it dump the entire memory. The end result can be: - the logic taking a lot of time dumping large regions of memory; - data disclosure due to the memory dumps; - an OOPS, if it tries to dump an unmapped memory region. Fix it by checking if the section length is too small before doing a hex dump. [ rjw: Subject tweaks ]
References
Impacted products
Vendor Product Version
Linux Linux Version: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9
Version: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9
Version: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9
Version: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9
Version: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9
Version: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9
Version: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9
Version: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/cper.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.7"
            },
            {
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              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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            },
            {
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nEFI/CPER: don\u0027t dump the entire memory region\n\nThe current logic at cper_print_fw_err() doesn\u0027t check if the\nerror record length is big enough to handle offset. On a bad firmware,\nif the ofset is above the actual record, length -= offset will\nunderflow, making it dump the entire memory.\n\nThe end result can be:\n\n - the logic taking a lot of time dumping large regions of memory;\n - data disclosure due to the memory dumps;\n - an OOPS, if it tries to dump an unmapped memory region.\n\nFix it by checking if the section length is too small before doing\na hex dump.\n\n[ rjw: Subject tweaks ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:19:09.627Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/02de64ab54b4bb0f1b21bb324aeff3b08612be33"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e09b522f2622841389c3b2f9ac4969e35c0809d"
        },
        {
          "url": "https://git.kernel.org/stable/c/64ae5aaa7ac93c83da456039e8ec747bfa8a7cff"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a9b1dda8481b82851a655c3bcc5b44879b95334"
        },
        {
          "url": "https://git.kernel.org/stable/c/7780c0bad2a3a70a8c0113a33c02f4151d901eb3"
        },
        {
          "url": "https://git.kernel.org/stable/c/a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91"
        },
        {
          "url": "https://git.kernel.org/stable/c/54e131db4cdffd946db890ff33ff2647053fd4f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/55cc6fe5716f678f06bcb95140882dfa684464ec"
        }
      ],
      "title": "EFI/CPER: don\u0027t dump the entire memory region",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43171",
    "datePublished": "2026-05-06T11:27:46.698Z",
    "dateReserved": "2026-05-01T14:12:55.990Z",
    "dateUpdated": "2026-05-11T22:19:09.627Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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