CVE-2015-2666: Stack-based buffer overflow in the get_matching_model_microcode function in arch/x86/kernel/cpu/microcode/i...

Security readout for executives and security teams

This is a Linux kernel flaw in early Intel microcode loading. A crafted microcode header in the boot initrd could trigger a stack buffer overflow and potentially elevate control during boot. The known prerequisite is already-privileged write access to initrd, so this is not presented as a remote internet exploit. Exposure is most plausible on older Linux systems before 4.0, especially x86 systems using Intel early microcode loading. The source bundle does not establish exposure for specific distributions beyond referenced Fedora and Red Hat advisories. Treat this as a legacy Linux hardening issue, not an emergency internet-facing exposure. Prioritize remediation on old production kernels, sensitive hosts, and systems where boot images are manually maintained or weakly controlled. Mitigation focus: Update to a vendor kernel containing the upstream fix for CVE-2015-2666.; Prioritize Fedora and Red Hat systems covered by the cited 2015 advisories.; Restrict initrd modification to trusted administrative workflows only..

Prepared

Jun 13, 2026, 22:39 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.