Vulnerability-Lookup

GHSA-PWG2-G943-8MR4

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

bpf: Validate BTF repeated field counts before expansion

btf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD, and btf_repeat_fields() expands repeatable fields from array elements into the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields().

The remaining-capacity check performs the expanded field count calculation in u32. A malformed BTF can wrap that calculation, causing the check to pass even when the expanded field count exceeds the scratch array capacity. The following memcpy() can then write past the end of the array.

Use checked addition and multiplication before copying repeated fields and reject impossible counts.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64354"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:17Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Validate BTF repeated field counts before expansion\n\nbtf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD,\nand btf_repeat_fields() expands repeatable fields from array elements\ninto the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields().\n\nThe remaining-capacity check performs the expanded field count calculation\nin u32. A malformed BTF can wrap that calculation, causing the check to\npass even when the expanded field count exceeds the scratch array\ncapacity. The following memcpy() can then write past the end of the\narray.\n\nUse checked addition and multiplication before copying repeated fields\nand reject impossible counts.",
  "id": "GHSA-pwg2-g943-8mr4",
  "modified": "2026-07-25T12:31:32Z",
  "published": "2026-07-25T12:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64354"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9452b594fd3aecbfd4aa0a6a1f741330a37dab7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5ff816d5f13900c3f1f3298cfcc61339e056e56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd407de2ef5dc70f1970b343ffaa16186340fdfd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff77d013b737c0f77d925e2f2c59f0cf3d76bd35"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64354 (GCVE-0-2026-64354)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-27 04:59

Title

bpf: Validate BTF repeated field counts before expansion

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Validate BTF repeated field counts before expansion btf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD, and btf_repeat_fields() expands repeatable fields from array elements into the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields(). The remaining-capacity check performs the expanded field count calculation in u32. A malformed BTF can wrap that calculation, causing the check to pass even when the expanded field count exceeds the scratch array capacity. The following memcpy() can then write past the end of the array. Use checked addition and multiplication before copying repeated fields and reject impossible counts.

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

References

4 references

URL	Tags
https://git.kernel.org/stable/c/c5ff816d5f13900c3…
https://git.kernel.org/stable/c/cd407de2ef5dc70f1…
https://git.kernel.org/stable/c/ff77d013b737c0f77…
https://git.kernel.org/stable/c/b9452b594fd3aecbf…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 797d73ee232dd1833dec4824bc53a22032e97c1c , < c5ff816d5f13900c3f1f3298cfcc61339e056e56 (git) Affected: 797d73ee232dd1833dec4824bc53a22032e97c1c , < cd407de2ef5dc70f1970b343ffaa16186340fdfd (git) Affected: 797d73ee232dd1833dec4824bc53a22032e97c1c , < ff77d013b737c0f77d925e2f2c59f0cf3d76bd35 (git) Affected: 797d73ee232dd1833dec4824bc53a22032e97c1c , < b9452b594fd3aecbfd4aa0a6a1f741330a37dab7 (git) Affected: 6f957d972feee9b385ea3ae6530310a84e55ba71 (git) Affected: 6.11.6 , < 6.12 (semver)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
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            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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    "datePublished": "2026-07-25T08:50:12.752Z",
    "dateReserved": "2026-07-19T15:36:31.782Z",
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}

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.

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GHSA-PWG2-G943-8MR4

CVE-2026-64354 (GCVE-0-2026-64354)

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Sightings

Nomenclature