CVE-2026-43171 (GCVE-0-2026-43171)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-07 17:14
VLAI?
Title
EFI/CPER: don't dump the entire memory region
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 ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 02de64ab54b4bb0f1b21bb324aeff3b08612be33 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 0e09b522f2622841389c3b2f9ac4969e35c0809d (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 64ae5aaa7ac93c83da456039e8ec747bfa8a7cff (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 5a9b1dda8481b82851a655c3bcc5b44879b95334 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 7780c0bad2a3a70a8c0113a33c02f4151d901eb3 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 54e131db4cdffd946db890ff33ff2647053fd4f6 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 55cc6fe5716f678f06bcb95140882dfa684464ec (git)
Create a notification for this product.
    Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/cper.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "02de64ab54b4bb0f1b21bb324aeff3b08612be33",
              "status": "affected",
              "version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
              "versionType": "git"
            },
            {
              "lessThan": "0e09b522f2622841389c3b2f9ac4969e35c0809d",
              "status": "affected",
              "version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
              "versionType": "git"
            },
            {
              "lessThan": "64ae5aaa7ac93c83da456039e8ec747bfa8a7cff",
              "status": "affected",
              "version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
              "versionType": "git"
            },
            {
              "lessThan": "5a9b1dda8481b82851a655c3bcc5b44879b95334",
              "status": "affected",
              "version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
              "versionType": "git"
            },
            {
              "lessThan": "7780c0bad2a3a70a8c0113a33c02f4151d901eb3",
              "status": "affected",
              "version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
              "versionType": "git"
            },
            {
              "lessThan": "a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91",
              "status": "affected",
              "version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
              "versionType": "git"
            },
            {
              "lessThan": "54e131db4cdffd946db890ff33ff2647053fd4f6",
              "status": "affected",
              "version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
              "versionType": "git"
            },
            {
              "lessThan": "55cc6fe5716f678f06bcb95140882dfa684464ec",
              "status": "affected",
              "version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/cper.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.252",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-05-07T17:14:29.768Z",
        "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": "2026-05-07T17:14:29.768Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43171",
      "date": "2026-05-09",
      "epss": "0.00024",
      "percentile": "0.07036"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43171\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T12:16:35.447\",\"lastModified\":\"2026-05-06T13:07:51.607\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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 ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/02de64ab54b4bb0f1b21bb324aeff3b08612be33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0e09b522f2622841389c3b2f9ac4969e35c0809d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54e131db4cdffd946db890ff33ff2647053fd4f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/55cc6fe5716f678f06bcb95140882dfa684464ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a9b1dda8481b82851a655c3bcc5b44879b95334\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64ae5aaa7ac93c83da456039e8ec747bfa8a7cff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7780c0bad2a3a70a8c0113a33c02f4151d901eb3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.