# CVE-2026-64507 — Linux

> As of 2026-08-19, CVE-2026-64507 is a vulnerability in Linux, EPSS 0.1% (4.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-64507, most recently “Spectre-v2 Branch Target Reuse (BTR) Attack Leaks Linux Kernel Memory Despite Existing Defenses (CVE-2026-64507, CVE-2026-64508)”.

**Last updated:** 2026-08-19

## What is CVE-2026-64507?

In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Enable IBPB flush on BPF JIT allocation Enable hardening against JIT spraying when Spectre-v2 mitigations are in use. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip enabling the IBPB flush if the BPF dispatcher is already using a retpoline sequence. This hardening applies only when BPF-JIT is in use. Guard the enabling under CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n.

1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 68 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 4.6% 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, last modified 2026-08-19

## Is CVE-2026-64507 being exploited?

No public exploitation evidence for CVE-2026-64507 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-08-19. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- **Linux**: Linux

## How to fix CVE-2026-64507

No vendor patch reference has been recorded for CVE-2026-64507 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-2026-64507

1 tracked threat in the Threadlinqs corpus references CVE-2026-64507, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Spectre-v2 Branch Target Reuse (BTR) Attack Leaks Linux Kernel Memory Despite Existing Defenses (CVE-2026-64507, CVE-2026-64508)](https://intel.threadlinqs.com/threat/TL-2026-2796) — HIGH · 2026-09-29

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-30. 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/25dbcd31781e2bc3cd63d873af1fcd06f863a126)
- [git.kernel.org (cb27f3bf915cc0f20fc0c48da9059304e39ebd35)](https://git.kernel.org/stable/c/cb27f3bf915cc0f20fc0c48da9059304e39ebd35)
- [git.kernel.org (9354248fc1c33a844ca1872761f6668b393e8c37)](https://git.kernel.org/stable/c/9354248fc1c33a844ca1872761f6668b393e8c37)
- [git.kernel.org (8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1)](https://git.kernel.org/stable/c/8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1)
- [git.kernel.org (52440e15d9628f8f239373c0f2e5e8f92feea2df)](https://git.kernel.org/stable/c/52440e15d9628f8f239373c0f2e5e8f92feea2df)

_Showing 5 of 6 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-64507
Full detection coverage and IOCs for threats exploiting CVE-2026-64507 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp