CVE-2026-64081 (GCVE-0-2026-64081)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:39
VLAI
Title
firmware: arm_ffa: Validate framework notification message layout
Summary
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Validate framework notification message layout Framework notifications carry an indirect message in the shared RX buffer. Validate the reported offset and size before using them, reject zero-length payloads, and ensure that any non-header payload starts at the UUID field rather than in the middle of the message header. Use the validated offset and size values for both kmemdup() and the UUID parsing path so malformed firmware data cannot drive an out-of-bounds read or an oversized allocation.
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
Linux Linux Affected: 285a5ea0f542db94c3ed11e01a71abb47d15cbf5 , < 3c51d99449dc5a01c08a7fce6071d6721f5aac83 (git)
Affected: 285a5ea0f542db94c3ed11e01a71abb47d15cbf5 , < 76eb90e2b03de147e12ab68ea8afd8ea0342df0a (git)
Affected: 285a5ea0f542db94c3ed11e01a71abb47d15cbf5 , < 4a1cc9e96b311d2609a6f963a5e35bd4ae730d97 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (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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{
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            "drivers/firmware/arm_ffa/driver.c"
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            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - The bug is reached when the ARM FF-A partition manager delivers a framework RX-buffer-full notification to the Linux host via per-CPU IRQ and SMCCC, not via network packets or physical device access.\nAC:L - A malicious or compromised FF-A sender partition can craft the indirect message header offset and size fields directly in its TX buffer and reliably trigger the vulnerable kmemdup path on delivery.\nPR:N - No Linux credentials, capabilities, or user-namespace privileges are checked or required on the vulnerable IRQ-driven path; exploitation only requires the ability to send a crafted FF-A indirect message from a peer partition or firmware.\nUI:N - Processing is automatic once the framework delivers the notification and fills the shared RX buffer; no victim user action is needed.\nS:U - The impact is kernel memory disclosure and denial of service within the host kernel security authority, not a VM escape or cross-IOMMU boundary bypass.\nC:H - Unvalidated offset and size allow kmemdup to copy attacker-chosen amounts of kernel memory beyond the bounded RX buffer, constituting an out-of-bounds read of kernel memory.\nI:H - The attacker-controlled out-of-bounds copy primitive reads adjacent kernel objects and is a standard building block for kernel exploit chains that achieve arbitrary write and code execution.\nA:H - Crafted values can cause kernel faults on invalid addresses during the out-of-bounds copy, or massive kmemdup allocations that exhaust kernel memory and crash or deny service."
            }
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        "dateUpdated": "2026-08-05T12:39:00.788Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4a1cc9e96b311d2609a6f963a5e35bd4ae730d97"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64081",
    "datePublished": "2026-07-19T15:39:53.433Z",
    "dateReserved": "2026-07-19T07:54:57.031Z",
    "dateUpdated": "2026-08-05T12:39:00.788Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
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      "current_release_date": "2026-07-21T05:43:54+00:00",
      "cve": "CVE-2026-64081",
      "id": "CVE-2026-64081",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: firmware: arm_ffa: Validate framework notification message layout",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64081.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-05T00:33:53Z",
      "cve": "CVE-2026-64081",
      "id": "CVE-2026-64081",
      "initial_release_date": "2026-07-21T13:00:02Z",
      "product_status:known_not_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64081",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64081.json",
      "version": "3"
    }
  }
}



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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

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.