CVE-2026-64520

Kernel memory corruption via unvalidated FF-A indices

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds write in the ARM FF-A driver in Linux Kernel allows attackers to corrupt kernel memory via malformed firmware responses. The __ffa_partition_info_get_regs path trusts firmware-supplied descriptor counts and indices, then copies past the caller's allocated array when fragment progress is inconsistent. Reachability requires an ARM system using FF-A and firmware that returns inconsistent partition data; successful writes compromise kernel confidentiality, integrity, and availability.

CVSS severity8.4
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the ARM FF-A driver in Linux Kernel allows attackers to corrupt kernel memory via malformed firmware responses. The __ffa_partition_info_get_regs path trusts firmware-supplied descriptor counts and indices, then copies past the caller's allocated array when fragment progress is inconsistent. Reachability requires an ARM system using FF-A and firmware that returns inconsistent partition data; successful writes compromise kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-64520
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.12
  2. Affected versionversion=ba85c644ac8dc37d9b01a3332c2f142cb4d46954 <3974ea1938406f9bfa7c1f48d4e43533f447bb08
  3. Affected versionversion=ba85c644ac8dc37d9b01a3332c2f142cb4d46954 <79d95c02ae0a95e6e80e8e92b7ca74ecee02854f
  4. Affected versionversion=ba85c644ac8dc37d9b01a3332c2f142cb4d46954 <f39bc7ebe75e2186b417a024a7f7e2fd4cc7eb95

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=ba85c644ac8dc37d9b01a3332c2f142cb4d46954 <3974ea1938406f9bfa7c1f48d4e43533f447bb08; version=ba85c644ac8dc37d9b01a3332c2f142cb4d46954 <79d95c02ae0a95e6e80e8e92b7ca74ecee02854f; version=ba85c644ac8dc37d9b01a3332c2f142cb4d46954 <f39bc7ebe75e2186b417a024a7f7e2fd4cc7eb95

Published CVSS scores

7.4Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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