CVE-2026-64520
ARM FF‑A firmware copy bug in Linux kernel allows out‑of‑bounds write
Is CVE-2026-64520 being exploited?
Not confirmed. CVE-2026-64520 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.13% probability of exploitation in the next 30 days.
How severe is CVE-2026-64520?
CVE-2026-64520 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-64520?
Yes. A fix has been recorded for CVE-2026-64520. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64520 affect?
CVE-2026-64520 affects Linux kernel (arm_ffa/FF-A path), ARM-based servers/SoCs/embedded devices using FF-A firmware, Trusted firmware components. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64520?
Apply kernel/firmware updates, restrict untrusted firmware, follow vendor advisories
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Firmware-controlled indices can trigger an OOB write in PARTITION_INFO_GET_REGS, causing kernel memory corruption leading to local privilege escalation or DoS.
Patch when possible
- affected>= ba85c644ac8dc37d9b01a3332c2f142cb4d46954 and < f39bc7ebe75e2186b417a024a7f7e2fd4cc7eb95
- affected>= ba85c644ac8dc37d9b01a3332c2f142cb4d46954 and < 79d95c02ae0a95e6e80e8e92b7ca74ecee02854f
- affected>= ba85c644ac8dc37d9b01a3332c2f142cb4d46954 and < 3974ea1938406f9bfa7c1f48d4e43533f447bb08
- affected6.12
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.