Comet Lake

A Skylake derivative: Linux's table of Intel models gives its core as Sky Lake, and GCC's selects -march=skylake for it.

Product lines

Why not x86-64-v4?

Comet Lake lacks AVX512BW, AVX512CD, AVX512DQ, AVX512F and AVX512VL, all of which x86-64-v4 requires.

Feature checklist

Other extensions

Notable extensions outside the x86-64 levels. Vendors sometimes disable these on individual models. Linked names lead to the extension's instructions.

• AES-NI
• PCLMULQDQ
• RDRAND
• RDSEED
• ADX

Known vulnerabilities

The CVEs that the sources of the vulnerability list name as affecting Comet Lake, in all of its models or in some of them.

• CVE-2025-40300 VMSCAPE
• CVE-2024-45332 Branch Privilege Injection: Indirect Branch Predictor Delayed Updates
• CVE-2024-28956 Indirect Target Selection
• CVE-2024-24853 Intel BIOS, UEFI and SMM: SMI Transfer Monitor transition order
• CVE-2022-40982 Gather Data Sampling
• CVE-2022-28693 Retbleed: Restricted RSB Alternate behavior
• CVE-2022-26373 Spectre variant 2: Post-barrier Return Stack Buffer Predictions
• CVE-2022-21180 Intel processor errata: Undefined MMIO Hang
• CVE-2022-21166 Processor MMIO Stale Data: Device Register Partial Write
• CVE-2022-21151 Optimization Removal of Security-critical Code
• CVE-2022-21127 Special Register Buffer Data Sampling: Special Register Buffer Data Sampling update Some models
• CVE-2022-21125 Processor MMIO Stale Data: Shared Buffers Data Sampling
• CVE-2022-21123 Processor MMIO Stale Data: Shared Buffers Data Read
• CVE-2022-0004 Intel BIOS, UEFI and SMM: Boot Guard and TXT lock override
• CVE-2022-0002 Spectre variant 2: Intra-mode Branch Target Injection
• CVE-2022-0001 Spectre variant 2: Branch History Injection
• CVE-2021-0127 Intel processor errata: Breakpoint control flow Some models
• CVE-2021-0089 Speculative Code Store Bypass
• CVE-2021-0086 Floating Point Value Injection
• CVE-2020-24512 Influence of Trivial Data Value in Cache Policy
• CVE-2020-24511 Spectre variant 2: IBRS Guest/Host
• CVE-2020-8696 Vector Register Sampling: Vector Register Sampling Active Some models
• CVE-2020-8695 RAPL Energy Reporting: RAPL energy reporting
• CVE-2020-0551 Load Value Injection Some models
• CVE-2020-0549 L1D Eviction Sampling Some models
• CVE-2020-0548 Vector Register Sampling Some models
• CVE-2020-0543 Special Register Buffer Data Sampling Some models
• CVE-2019-11157 Voltage Settings Modification
• CVE-2019-11135 TSX Asynchronous Abort Some models
• CVE-2019-1125 Spectre variant 1: Spectre v1 swapgs
• CVE-2018-12207 iTLB multihit: Machine Check Error Avoidance on Page Size Change
• CVE-2018-3640 Rogue System Register Read Some models
• CVE-2018-3639 Speculative Store Bypass
• CVE-2017-5753 Spectre variant 1: Bounds Check Bypass
• CVE-2017-5715 Spectre variant 2: Branch Target Injection

Other Intel Core (client) microarchitectures

• NetBurst (Prescott, Nocona) 2004 v1
• Core (Merom, Conroe) 2006 v1
• Penryn 2007 v1
• Nehalem 2008 v2
• Westmere 2010 v2
• Sandy Bridge 2011 v2
• Ivy Bridge 2012 v2
• Haswell 2013 v3
• Broadwell 2014 v3
• Skylake 2015 v3
• Kaby Lake 2016 v3
• Coffee Lake 2017 v3
• Cannon Lake 2018 v4
• Comet Lake 2019 v3
• Ice Lake (client) 2019 v4
• Tiger Lake 2020 v4
• Alder Lake 2021 v3
• Rocket Lake 2021 v4
• Raptor Lake 2022 v3
• Meteor Lake 2023 v3
• Arrow Lake 2024 v3
• Lunar Lake 2024 v3
• Panther Lake 2026 v3
• Nova Lake announced v4