Vulnerability-Lookup

GHSA-4HRG-CVR4-FF8F

Vulnerability from github – Published: 2024-12-29 12:30 – Updated: 2025-01-09 21:31

Details

In the Linux kernel, the following vulnerability has been resolved:

x86/CPU/AMD: Terminate the erratum_1386_microcode array

The erratum_1386_microcode array requires an empty entry at the end. Otherwise x86_match_cpu_with_stepping() will continue iterate the array after it ended.

Add an empty entry to erratum_1386_microcode to its end.

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-56721"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-29T12:15:06Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Terminate the erratum_1386_microcode array\n\nThe erratum_1386_microcode array requires an empty entry at the end.\nOtherwise x86_match_cpu_with_stepping() will continue iterate the array after\nit ended.\n\nAdd an empty entry to erratum_1386_microcode to its end.",
  "id": "GHSA-4hrg-cvr4-ff8f",
  "modified": "2025-01-09T21:31:28Z",
  "published": "2024-12-29T12:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56721"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82d6b82cf89d950982ac240ba068c3a7e1f23b0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccfee14f08b8699132b87bc6d78e0fa75bf094dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff6cdc407f4179748f4673c39b0921503199a0ad"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-56721 (GCVE-0-2024-56721)

Vulnerability from cvelistv5 – Published: 2024-12-29 11:29 – Updated: 2026-08-05 11:46

Title

x86/CPU/AMD: Terminate the erratum_1386_microcode array

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Terminate the erratum_1386_microcode array The erratum_1386_microcode array requires an empty entry at the end. Otherwise x86_match_cpu_with_stepping() will continue iterate the array after it ended. Add an empty entry to erratum_1386_microcode to its end.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 19:58 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/82d6b82cf89d95098…
https://git.kernel.org/stable/c/ccfee14f08b869913…
https://git.kernel.org/stable/c/ff6cdc407f4179748…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 29ba89f1895285f06c333546882e0c5ae9a6df23 , < 82d6b82cf89d950982ac240ba068c3a7e1f23b0a (git) Affected: 29ba89f1895285f06c333546882e0c5ae9a6df23 , < ccfee14f08b8699132b87bc6d78e0fa75bf094dd (git) Affected: 29ba89f1895285f06c333546882e0c5ae9a6df23 , < ff6cdc407f4179748f4673c39b0921503199a0ad (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.11.11 , ≤ 6.11.* (semver) Unaffected: 6.12.2 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.1,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-56721",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:58:17.697625Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-125",
                "description": "CWE-125 Out-of-bounds Read",
                "lang": "en",
                "type": "CWE"
              }
            ]
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T20:07:05.975Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/cpu/amd.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "82d6b82cf89d950982ac240ba068c3a7e1f23b0a",
              "status": "affected",
              "version": "29ba89f1895285f06c333546882e0c5ae9a6df23",
              "versionType": "git"
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            {
              "lessThan": "ccfee14f08b8699132b87bc6d78e0fa75bf094dd",
              "status": "affected",
              "version": "29ba89f1895285f06c333546882e0c5ae9a6df23",
              "versionType": "git"
            },
            {
              "lessThan": "ff6cdc407f4179748f4673c39b0921503199a0ad",
              "status": "affected",
              "version": "29ba89f1895285f06c333546882e0c5ae9a6df23",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/cpu/amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.10",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.2",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "6.10",
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              "negate": false,
              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Terminate the erratum_1386_microcode array\n\nThe erratum_1386_microcode array requires an empty entry at the end.\nOtherwise x86_match_cpu_with_stepping() will continue iterate the array after\nit ended.\n\nAdd an empty entry to erratum_1386_microcode to its end."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - `fix_erratum_1386()` runs from `init_amd_zen1()`/`init_amd_zen2()` during `identify_cpu()` at boot and on CPU onlining; there is no remote or adjacent input path, and the resulting misbehaviour is only observable to software running locally on the affected AMD Zen1/Zen2 machine.\nAC:L - On any family 0x17 CPU whose model/stepping does not match the two table entries, `x86_match_cpu_with_stepping()` runs past the array end on every single boot \u2014 deterministic, no race to win and no special preconditions.\nPR:L - The faulty walk executes automatically during CPU identification before any authentication exists, and observing or leveraging the consequences (skipped XSAVES erratum workaround, corrupted XMM state) needs only ordinary unprivileged local access; matches the CNA scoring of the identical bug in CVE-2025-37751.\nUI:N - The out-of-bounds walk happens automatically as part of boot-time CPU feature initialization and CPU hotplug; no victim action of any kind is involved.\nS:U - The out-of-bounds read and its consequences are entirely contained within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The loop performs an unbounded out-of-bounds read of whatever kernel `.rodata` follows `erratum_1386_microcode[]`, with no upper limit on how far it reads, and that out-of-bounds data is then consumed as CPU descriptor/microcode-revision values; additionally, wrongly skipping the erratum 1386 workaround leaves XSAVES able to expose stale XMM register contents across context switches.\nI:N - The defect is a read-only over-read \u2014 nothing is written outside the array bounds and no attacker-controlled data is stored \u2014 matching the I:N assigned to the identical `erratum_1386_microcode` terminator bug (CVE-2025-37751).\nA:H - The walk continues arbitrarily far past the array until it randomly encounters an entry with zero family and model, so depending on linker layout it can fault or trip UBSAN/KASAN and oops during early boot \u2014 exactly the boot-time crash seen with the analogous missing-sentinel errata arrays (CVE-2025-37929)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:46:19.207Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/82d6b82cf89d950982ac240ba068c3a7e1f23b0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccfee14f08b8699132b87bc6d78e0fa75bf094dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff6cdc407f4179748f4673c39b0921503199a0ad"
        }
      ],
      "title": "x86/CPU/AMD: Terminate the erratum_1386_microcode array",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56721",
    "datePublished": "2024-12-29T11:29:59.164Z",
    "dateReserved": "2024-12-27T15:00:39.858Z",
    "dateUpdated": "2026-08-05T11:46:19.207Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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