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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-27 04:59
VLAI
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
References
Impacted 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)
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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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    "redhat_vex": {
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      "cve": "CVE-2026-64354",
      "id": "CVE-2026-64354",
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      "product_status:known_affected": "184",
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      "title": "kernel: bpf: Validate BTF repeated field counts before expansion",
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      "current_release_date": "2026-07-25T16:01:08Z",
      "cve": "CVE-2026-64354",
      "id": "CVE-2026-64354",
      "initial_release_date": "2026-07-25T16:01:08Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64354",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64354.json",
      "version": "2"
    }
  }
}



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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.

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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.


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