Spectre and Meltdown Checks ^^^^^^^^^^^^^^^^^^^^^^^^^^^ Following section displays the output of a running shell script to tell if system is vulnerable against the several speculative execution CVEs that were made public in 2018. Script is available on `Spectre & Meltdown Checker Github `_. :: Spectre and Meltdown mitigation detection tool v0.43 Checking for vulnerabilities on current system Kernel is Linux 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 x86_64 CPU is AMD EPYC 7532 32-Core Processor Hardware check * Hardware support (CPU microcode) for mitigation techniques * Indirect Branch Restricted Speculation (IBRS) * SPEC_CTRL MSR is available: YES * CPU indicates IBRS capability: YES (IBRS_SUPPORT feature bit) * CPU indicates preferring IBRS always-on: NO * CPU indicates preferring IBRS over retpoline: YES * Indirect Branch Prediction Barrier (IBPB) * PRED_CMD MSR is available: YES * CPU indicates IBPB capability: YES (IBPB_SUPPORT feature bit) * Single Thread Indirect Branch Predictors (STIBP) * SPEC_CTRL MSR is available: YES * CPU indicates STIBP capability: YES (AMD STIBP feature bit) * CPU indicates preferring STIBP always-on: NO * Speculative Store Bypass Disable (SSBD) * CPU indicates SSBD capability: YES (AMD SSBD in SPEC_CTRL) * L1 data cache invalidation * FLUSH_CMD MSR is available: NO * CPU indicates L1D flush capability: NO * CPU supports Transactional Synchronization Extensions (TSX): NO * CPU supports Software Guard Extensions (SGX): NO * CPU supports Special Register Buffer Data Sampling (SRBDS): NO * CPU microcode is known to cause stability problems: NO (family 0x17 model 0x31 stepping 0x0 ucode 0x8301034 cpuid 0x830f10) * CPU microcode is the latest known available version: NO (latest version is 0x8301039 dated 2020/02/07 according to builtin firmwares DB v160.20200912+i20200722) * CPU vulnerability to the speculative execution attack variants * Vulnerable to CVE-2017-5753 (Spectre Variant 1, bounds check bypass): YES * Vulnerable to CVE-2017-5715 (Spectre Variant 2, branch target injection): YES * Vulnerable to CVE-2017-5754 (Variant 3, Meltdown, rogue data cache load): NO * Vulnerable to CVE-2018-3640 (Variant 3a, rogue system register read): NO * Vulnerable to CVE-2018-3639 (Variant 4, speculative store bypass): YES * Vulnerable to CVE-2018-3615 (Foreshadow (SGX), L1 terminal fault): NO * Vulnerable to CVE-2018-3620 (Foreshadow-NG (OS), L1 terminal fault): NO * Vulnerable to CVE-2018-3646 (Foreshadow-NG (VMM), L1 terminal fault): NO * Vulnerable to CVE-2018-12126 (Fallout, microarchitectural store buffer data sampling (MSBDS)): NO * Vulnerable to CVE-2018-12130 (ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)): NO * Vulnerable to CVE-2018-12127 (RIDL, microarchitectural load port data sampling (MLPDS)): NO * Vulnerable to CVE-2019-11091 (RIDL, microarchitectural data sampling uncacheable memory (MDSUM)): NO * Vulnerable to CVE-2019-11135 (ZombieLoad V2, TSX Asynchronous Abort (TAA)): NO * Vulnerable to CVE-2018-12207 (No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)): NO * Vulnerable to CVE-2020-0543 (Special Register Buffer Data Sampling (SRBDS)): NO CVE-2017-5753 aka 'Spectre Variant 1, bounds check bypass' * Mitigated according to the /sys interface: YES (Mitigation: usercopy/swapgs barriers and __user pointer sanitization) * Kernel has array_index_mask_nospec: YES (1 occurrence(s) found of x86 64 bits array_index_mask_nospec()) * Kernel has the Red Hat/Ubuntu patch: NO * Kernel has mask_nospec64 (arm64): NO * Kernel has array_index_nospec (arm64): NO > STATUS: NOT VULNERABLE (Mitigation: usercopy/swapgs barriers and __user pointer sanitization) CVE-2017-5715 aka 'Spectre Variant 2, branch target injection' * Mitigated according to the /sys interface: YES (Mitigation: Full AMD retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling) * Mitigation 1 * Kernel is compiled with IBRS support: YES * IBRS enabled and active: YES (for firmware code only) * Kernel is compiled with IBPB support: YES * IBPB enabled and active: YES * Mitigation 2 * Kernel has branch predictor hardening (arm): NO * Kernel compiled with retpoline option: YES * Kernel compiled with a retpoline-aware compiler: YES (kernel reports full retpoline compilation) > STATUS: NOT VULNERABLE (Full retpoline + IBPB are mitigating the vulnerability) CVE-2017-5754 aka 'Variant 3, Meltdown, rogue data cache load' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports Page Table Isolation (PTI): YES * PTI enabled and active: NO * Reduced performance impact of PTI: NO (PCID/INVPCID not supported, performance impact of PTI will be significant) * Running as a Xen PV DomU: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-3640 aka 'Variant 3a, rogue system register read' * CPU microcode mitigates the vulnerability: YES > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-3639 aka 'Variant 4, speculative store bypass' * Mitigated according to the /sys interface: YES (Mitigation: Speculative Store Bypass disabled via prctl and seccomp) * Kernel supports disabling speculative store bypass (SSB): YES (found in /proc/self/status) * SSB mitigation is enabled and active: YES (per-thread through prctl) * SSB mitigation currently active for selected processes: YES (systemd-journald systemd-logind systemd-networkd systemd-resolved systemd-timesyncd systemd-udevd) > STATUS: NOT VULNERABLE (Mitigation: Speculative Store Bypass disabled via prctl and seccomp) CVE-2018-3615 aka 'Foreshadow (SGX), L1 terminal fault' * CPU microcode mitigates the vulnerability: N/A > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-3620 aka 'Foreshadow-NG (OS), L1 terminal fault' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports PTE inversion: YES (found in kernel image) * PTE inversion enabled and active: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-3646 aka 'Foreshadow-NG (VMM), L1 terminal fault' * Information from the /sys interface: Not affected * This system is a host running a hypervisor: NO * Mitigation 1 (KVM) * EPT is disabled: N/A (the kvm_intel module is not loaded) * Mitigation 2 * L1D flush is supported by kernel: YES (found flush_l1d in kernel image) * L1D flush enabled: NO * Hardware-backed L1D flush supported: NO (flush will be done in software, this is slower) * Hyper-Threading (SMT) is enabled: YES > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-12126 aka 'Fallout, microarchitectural store buffer data sampling (MSBDS)' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image) * Kernel mitigation is enabled and active: NO * SMT is either mitigated or disabled: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-12130 aka 'ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image) * Kernel mitigation is enabled and active: NO * SMT is either mitigated or disabled: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-12127 aka 'RIDL, microarchitectural load port data sampling (MLPDS)' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image) * Kernel mitigation is enabled and active: NO * SMT is either mitigated or disabled: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2019-11091 aka 'RIDL, microarchitectural data sampling uncacheable memory (MDSUM)' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image) * Kernel mitigation is enabled and active: NO * SMT is either mitigated or disabled: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2019-11135 aka 'ZombieLoad V2, TSX Asynchronous Abort (TAA)' * Mitigated according to the /sys interface: YES (Not affected) * TAA mitigation is supported by kernel: YES (found tsx_async_abort in kernel image) * TAA mitigation enabled and active: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-12207 aka 'No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)' * Mitigated according to the /sys interface: YES (Not affected) * This system is a host running a hypervisor: NO * iTLB Multihit mitigation is supported by kernel: YES (found itlb_multihit in kernel image) * iTLB Multihit mitigation enabled and active: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2020-0543 aka 'Special Register Buffer Data Sampling (SRBDS)' * SRBDS mitigation control is supported by the kernel: NO * SRBDS mitigation control is enabled and active: NO (SRBDS not found in sysfs hierarchy) > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) > SUMMARY: CVE-2017-5753:OK CVE-2017-5715:OK CVE-2017-5754:OK CVE-2018-3640:OK CVE-2018-3639:OK CVE-2018-3615:OK CVE-2018-3620:OK CVE-2018-3646:OK CVE-2018-12126:OK CVE-2018-12130:OK CVE-2018-12127:OK CVE-2019-11091:OK CVE-2019-11135:OK CVE-2018-12207:OK CVE-2020-0543:OK Need more detailed information about mitigation options? Use --explain A false sense of security is worse than no security at all, see --disclaimer :: Spectre and Meltdown mitigation detection tool v0.43 Checking for vulnerabilities on current system Kernel is Linux 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 x86_64 CPU is AMD EPYC 7532 32-Core Processor Hardware check * Hardware support (CPU microcode) for mitigation techniques * Indirect Branch Restricted Speculation (IBRS) * SPEC_CTRL MSR is available: YES * CPU indicates IBRS capability: YES (IBRS_SUPPORT feature bit) * CPU indicates preferring IBRS always-on: NO * CPU indicates preferring IBRS over retpoline: YES * Indirect Branch Prediction Barrier (IBPB) * PRED_CMD MSR is available: YES * CPU indicates IBPB capability: YES (IBPB_SUPPORT feature bit) * Single Thread Indirect Branch Predictors (STIBP) * SPEC_CTRL MSR is available: YES * CPU indicates STIBP capability: YES (AMD STIBP feature bit) * CPU indicates preferring STIBP always-on: NO * Speculative Store Bypass Disable (SSBD) * CPU indicates SSBD capability: YES (AMD SSBD in SPEC_CTRL) * L1 data cache invalidation * FLUSH_CMD MSR is available: NO * CPU indicates L1D flush capability: NO * CPU supports Transactional Synchronization Extensions (TSX): NO * CPU supports Software Guard Extensions (SGX): NO * CPU supports Special Register Buffer Data Sampling (SRBDS): NO * CPU microcode is known to cause stability problems: NO (family 0x17 model 0x31 stepping 0x0 ucode 0x8301034 cpuid 0x830f10) * CPU microcode is the latest known available version: NO (latest version is 0x8301039 dated 2020/02/07 according to builtin firmwares DB v160.20200912+i20200722) * CPU vulnerability to the speculative execution attack variants * Vulnerable to CVE-2017-5753 (Spectre Variant 1, bounds check bypass): YES * Vulnerable to CVE-2017-5715 (Spectre Variant 2, branch target injection): YES * Vulnerable to CVE-2017-5754 (Variant 3, Meltdown, rogue data cache load): NO * Vulnerable to CVE-2018-3640 (Variant 3a, rogue system register read): NO * Vulnerable to CVE-2018-3639 (Variant 4, speculative store bypass): YES * Vulnerable to CVE-2018-3615 (Foreshadow (SGX), L1 terminal fault): NO * Vulnerable to CVE-2018-3620 (Foreshadow-NG (OS), L1 terminal fault): NO * Vulnerable to CVE-2018-3646 (Foreshadow-NG (VMM), L1 terminal fault): NO * Vulnerable to CVE-2018-12126 (Fallout, microarchitectural store buffer data sampling (MSBDS)): NO * Vulnerable to CVE-2018-12130 (ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)): NO * Vulnerable to CVE-2018-12127 (RIDL, microarchitectural load port data sampling (MLPDS)): NO * Vulnerable to CVE-2019-11091 (RIDL, microarchitectural data sampling uncacheable memory (MDSUM)): NO * Vulnerable to CVE-2019-11135 (ZombieLoad V2, TSX Asynchronous Abort (TAA)): NO * Vulnerable to CVE-2018-12207 (No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)): NO * Vulnerable to CVE-2020-0543 (Special Register Buffer Data Sampling (SRBDS)): NO CVE-2017-5753 aka 'Spectre Variant 1, bounds check bypass' * Mitigated according to the /sys interface: YES (Mitigation: usercopy/swapgs barriers and __user pointer sanitization) * Kernel has array_index_mask_nospec: YES (1 occurrence(s) found of x86 64 bits array_index_mask_nospec()) * Kernel has the Red Hat/Ubuntu patch: NO * Kernel has mask_nospec64 (arm64): NO * Kernel has array_index_nospec (arm64): NO > STATUS: NOT VULNERABLE (Mitigation: usercopy/swapgs barriers and __user pointer sanitization) CVE-2017-5715 aka 'Spectre Variant 2, branch target injection' * Mitigated according to the /sys interface: YES (Mitigation: Full AMD retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling) * Mitigation 1 * Kernel is compiled with IBRS support: YES * IBRS enabled and active: YES (for firmware code only) * Kernel is compiled with IBPB support: YES * IBPB enabled and active: YES * Mitigation 2 * Kernel has branch predictor hardening (arm): NO * Kernel compiled with retpoline option: YES * Kernel compiled with a retpoline-aware compiler: YES (kernel reports full retpoline compilation) > STATUS: NOT VULNERABLE (Full retpoline + IBPB are mitigating the vulnerability) CVE-2017-5754 aka 'Variant 3, Meltdown, rogue data cache load' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports Page Table Isolation (PTI): YES * PTI enabled and active: NO * Reduced performance impact of PTI: NO (PCID/INVPCID not supported, performance impact of PTI will be significant) * Running as a Xen PV DomU: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-3640 aka 'Variant 3a, rogue system register read' * CPU microcode mitigates the vulnerability: YES > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-3639 aka 'Variant 4, speculative store bypass' * Mitigated according to the /sys interface: YES (Mitigation: Speculative Store Bypass disabled via prctl and seccomp) * Kernel supports disabling speculative store bypass (SSB): YES (found in /proc/self/status) * SSB mitigation is enabled and active: YES (per-thread through prctl) * SSB mitigation currently active for selected processes: YES (systemd-journald systemd-logind systemd-networkd systemd-resolved systemd-timesyncd systemd-udevd) > STATUS: NOT VULNERABLE (Mitigation: Speculative Store Bypass disabled via prctl and seccomp) CVE-2018-3615 aka 'Foreshadow (SGX), L1 terminal fault' * CPU microcode mitigates the vulnerability: N/A > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-3620 aka 'Foreshadow-NG (OS), L1 terminal fault' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports PTE inversion: YES (found in kernel image) * PTE inversion enabled and active: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-3646 aka 'Foreshadow-NG (VMM), L1 terminal fault' * Information from the /sys interface: Not affected * This system is a host running a hypervisor: NO * Mitigation 1 (KVM) * EPT is disabled: N/A (the kvm_intel module is not loaded) * Mitigation 2 * L1D flush is supported by kernel: YES (found flush_l1d in kernel image) * L1D flush enabled: NO * Hardware-backed L1D flush supported: NO (flush will be done in software, this is slower) * Hyper-Threading (SMT) is enabled: YES > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-12126 aka 'Fallout, microarchitectural store buffer data sampling (MSBDS)' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image) * Kernel mitigation is enabled and active: NO * SMT is either mitigated or disabled: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-12130 aka 'ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image) * Kernel mitigation is enabled and active: NO * SMT is either mitigated or disabled: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-12127 aka 'RIDL, microarchitectural load port data sampling (MLPDS)' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image) * Kernel mitigation is enabled and active: NO * SMT is either mitigated or disabled: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2019-11091 aka 'RIDL, microarchitectural data sampling uncacheable memory (MDSUM)' * Mitigated according to the /sys interface: YES (Not affected) * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image) * Kernel mitigation is enabled and active: NO * SMT is either mitigated or disabled: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2019-11135 aka 'ZombieLoad V2, TSX Asynchronous Abort (TAA)' * Mitigated according to the /sys interface: YES (Not affected) * TAA mitigation is supported by kernel: YES (found tsx_async_abort in kernel image) * TAA mitigation enabled and active: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2018-12207 aka 'No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)' * Mitigated according to the /sys interface: YES (Not affected) * This system is a host running a hypervisor: NO * iTLB Multihit mitigation is supported by kernel: YES (found itlb_multihit in kernel image) * iTLB Multihit mitigation enabled and active: NO > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) CVE-2020-0543 aka 'Special Register Buffer Data Sampling (SRBDS)' * SRBDS mitigation control is supported by the kernel: NO * SRBDS mitigation control is enabled and active: NO (SRBDS not found in sysfs hierarchy) > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable) > SUMMARY: CVE-2017-5753:OK CVE-2017-5715:OK CVE-2017-5754:OK CVE-2018-3640:OK CVE-2018-3639:OK CVE-2018-3615:OK CVE-2018-3620:OK CVE-2018-3646:OK CVE-2018-12126:OK CVE-2018-12130:OK CVE-2018-12127:OK CVE-2019-11091:OK CVE-2019-11135:OK CVE-2018-12207:OK CVE-2020-0543:OK Need more detailed information about mitigation options? Use --explain A false sense of security is worse than no security at all, see --disclaimer