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CVE-2026-64520 (GCVE-0-2026-64520)

Vulnerability from cvelistv5 – Published: 2026-07-25 09:14 – Updated: 2026-08-05 12:42
VLAI
Title
firmware: arm_ffa: Bound PARTITION_INFO_GET_REGS copies
Summary
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Bound PARTITION_INFO_GET_REGS copies The register-based PARTITION_INFO_GET path trusted the firmware-provided indices when copying partition descriptors into the caller buffer. Reject inconsistent counts or index progressions so the copy loop cannot write past the allocated array. (fixed cur_idx when exactly one descriptor in the first fragment)
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ba85c644ac8dc37d9b01a3332c2f142cb4d46954 , < f39bc7ebe75e2186b417a024a7f7e2fd4cc7eb95 (git)
Affected: ba85c644ac8dc37d9b01a3332c2f142cb4d46954 , < 79d95c02ae0a95e6e80e8e92b7ca74ecee02854f (git)
Affected: ba85c644ac8dc37d9b01a3332c2f142cb4d46954 , < 3974ea1938406f9bfa7c1f48d4e43533f447bb08 (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/firmware/arm_ffa/driver.c"
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              "versionType": "semver"
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              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_ffa: Bound PARTITION_INFO_GET_REGS copies\n\nThe register-based PARTITION_INFO_GET path trusted the firmware-provided\nindices when copying partition descriptors into the caller buffer.\nReject inconsistent counts or index progressions so the copy loop cannot\nwrite past the allocated array.\n\n(fixed cur_idx when exactly one descriptor in the first fragment)"
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation occurs through local SMC/HVC responses from the co-resident FF-A partition manager or hypervisor; no network, physical-device, or userspace path reaches the vulnerable parser.\nAC:L - The responder controls both discovery responses and every fragment, allowing deterministic count mismatches, invalid indices, and non-progressing sequences without a race or condition outside its control.\nPR:N - The malformed response is accepted automatically during kernel initialization without authentication or Linux credentials; the triggering firmware or hypervisor requires no privileges within the affected Linux instance.\nUI:N - Partition discovery executes automatically during FF-A initialization, so exploitation requires no victim action.\nS:U - The vulnerable driver and the corrupted heap, stack, and control-flow resources are all within the same Linux kernel security authority.\nC:H - Oversized fragments read beyond the register-result stack object, while exploitable heap corruption can provide kernel-memory disclosure primitives.\nI:H - The responder can repeatedly supply fully controlled 24-byte descriptors beyond the allocated array, enabling extensive heap corruption and potential control-flow hijacking.\nA:H - Large or non-progressing indices can cause massive out-of-bounds writes, infinite processing, kernel faults, or panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:42:34.515Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/3974ea1938406f9bfa7c1f48d4e43533f447bb08"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64520",
    "datePublished": "2026-07-25T09:14:46.005Z",
    "dateReserved": "2026-07-19T15:36:31.794Z",
    "dateUpdated": "2026-08-05T12:42:34.515Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-10",
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      "percentile": "0.03005"
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    "redhat_vex": {
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      "current_release_date": "2026-07-29T07:56:18+00:00",
      "cve": "CVE-2026-64520",
      "id": "CVE-2026-64520",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: firmware: arm_ffa: Bound PARTITION_INFO_GET_REGS copies",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64520.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-07T16:59:51Z",
      "cve": "CVE-2026-64520",
      "id": "CVE-2026-64520",
      "initial_release_date": "2026-07-25T15:57:50Z",
      "product_status:known_affected": "17",
      "product_status:known_not_affected": "281",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64520",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64520.json",
      "version": "4"
    }
  }
}



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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.

Sightings

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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.


Detection rules are retrieved from Rulezet.