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CVE-2026-64508 is a Linux kernel BPF JIT hardening vulnerability related to Branch Target Reuse (BTR), a Spectre v2 variant. The BPF JIT allocator packs multiple small programs into shared executable allocations and reuses memory after programs are freed. Stale indirect-branch predictor entries from a prior program can remain associated with a reused address, causing an indirect branch into newly generated code to speculatively follow an obsolete target. This creates a transient execute-after-free-like speculative-control-flow primitive. The kernel fix adds an architecture-selectable indirect-branch-predictor flush before reused JIT memory is populated; the default implementation is a no-op unless an architecture enables a flush function.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
One of two CVEs assigned to the Branch Target Reuse (BTR) Spectre v2 variant. The attack reuses stale branch-target predictions following JIT code-memory reuse, allowing speculative data access that can be measured through cache side channels; researchers recovered a root password hash from a running Linux su process in minutes.
A Linux kernel CVE referenced as part of the mitigations released for the Branch Target Reuse Spectre-v2 variant.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.