Vulnerability-Lookup

GHSA-MRHW-XCQ4-7JW7

Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-17 21:31

Details

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

bpf: fix potential 32-bit overflow when accessing ARRAY map element

If BPF array map is bigger than 4GB, element pointer calculation can overflow because both index and elem_size are u32. Fix this everywhere by forcing 64-bit multiplication. Extract this formula into separate small helper and use it consistently in various places.

Speculative-preventing formula utilizing index_mask trick is left as is, but explicit u64 casts are added in both places.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50167"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:47Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix potential 32-bit overflow when accessing ARRAY map element\n\nIf BPF array map is bigger than 4GB, element pointer calculation can\noverflow because both index and elem_size are u32. Fix this everywhere\nby forcing 64-bit multiplication. Extract this formula into separate\nsmall helper and use it consistently in various places.\n\nSpeculative-preventing formula utilizing index_mask trick is left as is,\nbut explicit u64 casts are added in both places.",
  "id": "GHSA-mrhw-xcq4-7jw7",
  "modified": "2025-11-17T21:31:19Z",
  "published": "2025-06-18T12:30:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50167"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/063e092534d4c6785228e5b1eb6e9329f66ccbe4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c7256b880b3a5aa1895fd169a34aa4224a11862"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87ac0d600943994444e24382a87aa19acc4cd3d4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-50167 (GCVE-0-2022-50167)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:03 – Updated: 2026-08-05 08:57

Title

bpf: fix potential 32-bit overflow when accessing ARRAY map element

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: fix potential 32-bit overflow when accessing ARRAY map element If BPF array map is bigger than 4GB, element pointer calculation can overflow because both index and elem_size are u32. Fix this everywhere by forcing 64-bit multiplication. Extract this formula into separate small helper and use it consistently in various places. Speculative-preventing formula utilizing index_mask trick is left as is, but explicit u64 casts are added in both places.

Severity

7.8 (High)


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

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/063e092534d4c6785…
https://git.kernel.org/stable/c/3c7256b880b3a5aa1…
https://git.kernel.org/stable/c/87ac0d60094399444…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c85d69135a9175c50a823d04d62d932312d037b3 , < 063e092534d4c6785228e5b1eb6e9329f66ccbe4 (git) Affected: c85d69135a9175c50a823d04d62d932312d037b3 , < 3c7256b880b3a5aa1895fd169a34aa4224a11862 (git) Affected: c85d69135a9175c50a823d04d62d932312d037b3 , < 87ac0d600943994444e24382a87aa19acc4cd3d4 (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 5.18.18 , ≤ 5.18.* (semver) Unaffected: 5.19.2 , ≤ 5.19.* (semver) Unaffected: 6.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/arraymap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "063e092534d4c6785228e5b1eb6e9329f66ccbe4",
              "status": "affected",
              "version": "c85d69135a9175c50a823d04d62d932312d037b3",
              "versionType": "git"
            },
            {
              "lessThan": "3c7256b880b3a5aa1895fd169a34aa4224a11862",
              "status": "affected",
              "version": "c85d69135a9175c50a823d04d62d932312d037b3",
              "versionType": "git"
            },
            {
              "lessThan": "87ac0d600943994444e24382a87aa19acc4cd3d4",
              "status": "affected",
              "version": "c85d69135a9175c50a823d04d62d932312d037b3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/arraymap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.18",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.2",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix potential 32-bit overflow when accessing ARRAY map element\n\nIf BPF array map is bigger than 4GB, element pointer calculation can\noverflow because both index and elem_size are u32. Fix this everywhere\nby forcing 64-bit multiplication. Extract this formula into separate\nsmall helper and use it consistently in various places.\n\nSpeculative-preventing formula utilizing index_mask trick is left as is,\nbut explicit u64 casts are added in both places."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in BPF ARRAY map element pointer math in kernel/bpf/arraymap.c, reached only via the local bpf(2) syscall (map create/lookup/update and map FD release), not via network packet processing.\nAC:L - An attacker who can create a \u003e4GB ARRAY map fully controls map size, indices, timer arming, and FD close, so the 32-bit overflow and resulting bad pointer/timer mishandling are reliably triggerable with no conditions outside their control.\nPR:L - BPF ARRAY map create/use is available to an unprivileged local user when unprivileged BPF is enabled, and the higher-impact timer path needs only CAP_BPF (not full root); when uncertain, the lower privilege requirement is scored.\nUI:N - Exploitation requires only attacker-controlled bpf(2) operations and closing their own map FD; no victim user action is needed.\nS:U - Impact stays within the host kernel\u2019s authority (local memory corruption / privilege escalation); there is no VM, IOMMU, or other security-authority boundary crossed.\nC:H - On map uref drop, array_map_free_timers skips high-index timers due to the overflow, leaving live hrtimers into map memory that is later freed\u2014a use-after-free that can be leveraged for arbitrary kernel read.\nI:H - The same timer use-after-free (and wrong-element update/free of kernel-managed map fields) yields a corruptible kernel object and is exploitable for arbitrary write / control-flow hijacking.\nA:H - A use-after-free in a softirq hrtimer callback can oops/panic the kernel, and guidance treats any UAF as high availability impact even when not fully exploited."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:57:36.387Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/063e092534d4c6785228e5b1eb6e9329f66ccbe4"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c7256b880b3a5aa1895fd169a34aa4224a11862"
        },
        {
          "url": "https://git.kernel.org/stable/c/87ac0d600943994444e24382a87aa19acc4cd3d4"
        }
      ],
      "title": "bpf: fix potential 32-bit overflow when accessing ARRAY map element",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50167",
    "datePublished": "2025-06-18T11:03:20.997Z",
    "dateReserved": "2025-06-18T10:57:27.426Z",
    "dateUpdated": "2026-08-05T08:57:36.387Z",
    "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.

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.
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GHSA-MRHW-XCQ4-7JW7

CVE-2022-50167 (GCVE-0-2022-50167)

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