Threat Intelligence / CVE / CVE-2026-64508

CVE-2026-64508 — Linux

EPSS 0.2% (higher than 10.6% of all scored CVEs) · Priority 0.4/10 · Published 2026-07-25

As of 2026-08-19, CVE-2026-64508 is a vulnerability in Linux, EPSS 0.2% (10.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-64508, 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-2026-64508?

In the Linux kernel, the following vulnerability has been resolved: bpf: Support for hardening against JIT spraying The BPF JIT allocator packs many small programs into larger executable allocations and reuses space within those allocations as programs are loaded and freed. When fresh code is written into space that a previous program occupied, an indirect jump into the new program can reuse a branch prediction left behind by the old one. Flush the indirect branch predictors before reusing JIT memory so that indirect jumps into a newly written program don't reuse predictions from an old program that occupied the same space. Introduce bpf_arch_pred_flush_enabled static key and bpf_arch_pred_flush static call for flushing the branch predictors on JIT memory reuse. Architectures that need a flush, can update it to a predictor flush function. By default, its a NOP and does not emit any CALL. Allocations larger than a pack are not covered by this flush. That is safe because cBPF programs (the unprivileged attack surface) are bounded well below a pack size. Issue a warning if this assumption is ever violated while the flush is active.

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)
0.2% probability of exploitation in the next 30 days, higher than 10.6% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
0.4/10 — 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-2026-64508 being exploited?

No public exploitation evidence for CVE-2026-64508 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

How to fix CVE-2026-64508

No vendor patch reference has been recorded for CVE-2026-64508 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-2026-64508

1 tracked threat in the Threadlinqs corpus references CVE-2026-64508, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

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

Other references

Showing 5 of 6 recorded references.

Full detection coverage & IOCs for threats exploiting CVE-2026-64508 are available via the Threadlinqs MCP server (Purple tier). View plans →

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