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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
<https://github.com/speed47/spectre-meltdown-checker>`_.
::
Spectre and Meltdown mitigation detection tool v0.45
Checking for vulnerabilities on current system
Kernel is Linux 5.15.0-46-generic #49-Ubuntu SMP Thu Aug 4 18:03:25 UTC 2022 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)
* 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
* 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 0x8301038 cpuid 0x830f10)
* CPU microcode is the latest known available version: NO (latest version is 0x8301052 dated 2021/11/11 according to builtin firmwares DB v222+i20220208)
* CPU vulnerability to the speculative execution attack variants
* Affected by CVE-2017-5753 (Spectre Variant 1, bounds check bypass): YES
* Affected by CVE-2017-5715 (Spectre Variant 2, branch target injection): YES
* Affected by CVE-2017-5754 (Variant 3, Meltdown, rogue data cache load): NO
* Affected by CVE-2018-3640 (Variant 3a, rogue system register read): NO
* Affected by CVE-2018-3639 (Variant 4, speculative store bypass): YES
* Affected by CVE-2018-3615 (Foreshadow (SGX), L1 terminal fault): NO
* Affected by CVE-2018-3620 (Foreshadow-NG (OS), L1 terminal fault): NO
* Affected by CVE-2018-3646 (Foreshadow-NG (VMM), L1 terminal fault): NO
* Affected by CVE-2018-12126 (Fallout, microarchitectural store buffer data sampling (MSBDS)): NO
* Affected by CVE-2018-12130 (ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)): NO
* Affected by CVE-2018-12127 (RIDL, microarchitectural load port data sampling (MLPDS)): NO
* Affected by CVE-2019-11091 (RIDL, microarchitectural data sampling uncacheable memory (MDSUM)): NO
* Affected by CVE-2019-11135 (ZombieLoad V2, TSX Asynchronous Abort (TAA)): NO
* Affected by CVE-2018-12207 (No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)): NO
* Affected by 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)
> STATUS: UNKNOWN (/sys vulnerability interface use forced, but its not available!)
CVE-2017-5715 aka Spectre Variant 2, branch target injection
* Mitigated according to the /sys interface: YES (Mitigation: Retpolines, IBPB: conditional, IBRS_FW, STIBP: always-on, RSB filling)
> STATUS: VULNERABLE (retpoline+IBPB is needed to mitigate the vulnerability)
CVE-2017-5754 aka Variant 3, Meltdown, rogue data cache load
* Mitigated according to the /sys interface: YES (Not affected)
* Running as a Xen PV DomU: NO
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
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 affected)
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)
> 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 affected)
CVE-2018-3620 aka Foreshadow-NG (OS), L1 terminal fault
* Mitigated according to the /sys interface: YES (Not affected)
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
CVE-2018-3646 aka Foreshadow-NG (VMM), L1 terminal fault
* Information from the /sys interface: Not affected
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
CVE-2018-12126 aka Fallout, microarchitectural store buffer data sampling (MSBDS)
* Mitigated according to the /sys interface: YES (Not affected)
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
CVE-2018-12130 aka ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)
* Mitigated according to the /sys interface: YES (Not affected)
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
CVE-2018-12127 aka RIDL, microarchitectural load port data sampling (MLPDS)
* Mitigated according to the /sys interface: YES (Not affected)
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
CVE-2019-11091 aka RIDL, microarchitectural data sampling uncacheable memory (MDSUM)
* Mitigated according to the /sys interface: YES (Not affected)
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
CVE-2019-11135 aka ZombieLoad V2, TSX Asynchronous Abort (TAA)
* Mitigated according to the /sys interface: YES (Not affected)
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
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)
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
CVE-2020-0543 aka Special Register Buffer Data Sampling (SRBDS)
* Mitigated according to the /sys interface: YES (Not affected)
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not affected)
> SUMMARY: CVE-2017-5753:?? CVE-2017-5715:KO 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
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