# CVE-2026-64520 — Linux

> As of 2026-07-25, CVE-2026-64520 is a vulnerability in Linux, EPSS 0.1% (5.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-64520 as of 2026-07-25; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-25

## What is CVE-2026-64520?

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)

1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 72 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 5.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 0.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-25

## Is CVE-2026-64520 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Linux](https://intel.threadlinqs.com/vendors/linux): Linux

## How to fix CVE-2026-64520

No vendor patch reference has been recorded for CVE-2026-64520 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-64520

No threat campaign in the Threadlinqs corpus currently references CVE-2026-64520, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-26. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [git.kernel.org](https://git.kernel.org/stable/c/f39bc7ebe75e2186b417a024a7f7e2fd4cc7eb95)
- [git.kernel.org (79d95c02ae0a95e6e80e8e92b7ca74ecee02854f)](https://git.kernel.org/stable/c/79d95c02ae0a95e6e80e8e92b7ca74ecee02854f)
- [git.kernel.org (3974ea1938406f9bfa7c1f48d4e43533f447bb08)](https://git.kernel.org/stable/c/3974ea1938406f9bfa7c1f48d4e43533f447bb08)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-64520
Full detection coverage and IOCs for threats exploiting CVE-2026-64520 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp