1 Spectre and Meltdown Checks
2 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
4 Following section displays the output of a running shell script to tell if
5 system is vulnerable against the several speculative execution CVEs that were
6 made public in 2018. Script is available on `Spectre & Meltdown Checker Github
7 <https://github.com/speed47/spectre-meltdown-checker>`_.
11 Spectre and Meltdown mitigation detection tool v0.44+
13 Checking for vulnerabilities on current system
14 Kernel is Linux 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64
15 CPU is AMD EPYC 7532 32-Core Processor
18 * Hardware support (CPU microcode) for mitigation techniques
19 * Indirect Branch Restricted Speculation (IBRS)
20 * SPEC_CTRL MSR is available: YES
21 * CPU indicates IBRS capability: YES (IBRS_SUPPORT feature bit)
22 * CPU indicates preferring IBRS always-on: NO
23 * CPU indicates preferring IBRS over retpoline: YES
24 * Indirect Branch Prediction Barrier (IBPB)
25 * PRED_CMD MSR is available: YES
26 * CPU indicates IBPB capability: YES (IBPB_SUPPORT feature bit)
27 * Single Thread Indirect Branch Predictors (STIBP)
28 * SPEC_CTRL MSR is available: YES
29 * CPU indicates STIBP capability: YES (AMD STIBP feature bit)
30 * CPU indicates preferring STIBP always-on: NO
31 * Speculative Store Bypass Disable (SSBD)
32 * CPU indicates SSBD capability: YES (AMD SSBD in SPEC_CTRL)
33 * L1 data cache invalidation
34 * FLUSH_CMD MSR is available: NO
35 * CPU indicates L1D flush capability: NO
36 * CPU supports Transactional Synchronization Extensions (TSX): NO
37 * CPU supports Software Guard Extensions (SGX): NO
38 * CPU supports Special Register Buffer Data Sampling (SRBDS): NO
39 * CPU microcode is known to cause stability problems: NO (family 0x17 model 0x31 stepping 0x0 ucode 0x8301038 cpuid 0x830f10)
40 * CPU microcode is the latest known available version: NO (latest version is 0x830104d dated 2020/07/28 according to builtin firmwares DB v191+i20210217)
41 * CPU vulnerability to the speculative execution attack variants
42 * Affected by CVE-2017-5753 (Spectre Variant 1, bounds check bypass): YES
43 * Affected by CVE-2017-5715 (Spectre Variant 2, branch target injection): YES
44 * Affected by CVE-2017-5754 (Variant 3, Meltdown, rogue data cache load): NO
45 * Affected by CVE-2018-3640 (Variant 3a, rogue system register read): NO
46 * Affected by CVE-2018-3639 (Variant 4, speculative store bypass): YES
47 * Affected by CVE-2018-3615 (Foreshadow (SGX), L1 terminal fault): NO
48 * Affected by CVE-2018-3620 (Foreshadow-NG (OS), L1 terminal fault): NO
49 * Affected by CVE-2018-3646 (Foreshadow-NG (VMM), L1 terminal fault): NO
50 * Affected by CVE-2018-12126 (Fallout, microarchitectural store buffer data sampling (MSBDS)): NO
51 * Affected by CVE-2018-12130 (ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)): NO
52 * Affected by CVE-2018-12127 (RIDL, microarchitectural load port data sampling (MLPDS)): NO
53 * Affected by CVE-2019-11091 (RIDL, microarchitectural data sampling uncacheable memory (MDSUM)): NO
54 * Affected by CVE-2019-11135 (ZombieLoad V2, TSX Asynchronous Abort (TAA)): NO
55 * Affected by CVE-2018-12207 (No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)): NO
56 * Affected by CVE-2020-0543 (Special Register Buffer Data Sampling (SRBDS)): NO
58 CVE-2017-5753 aka Spectre Variant 1, bounds check bypass
59 * Mitigated according to the /sys interface: YES (Mitigation: usercopy/swapgs barriers and __user pointer sanitization)
60 * Kernel has array_index_mask_nospec: YES (1 occurrence(s) found of x86 64 bits array_index_mask_nospec())
61 * Kernel has the Red Hat/Ubuntu patch: NO
62 * Kernel has mask_nospec64 (arm64): NO
63 * Kernel has array_index_nospec (arm64): NO
64 > STATUS: NOT VULNERABLE (Mitigation: usercopy/swapgs barriers and __user pointer sanitization)
66 CVE-2017-5715 aka Spectre Variant 2, branch target injection
67 * Mitigated according to the /sys interface: YES (Mitigation: Full AMD retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling)
69 * Kernel is compiled with IBRS support: YES
70 * IBRS enabled and active: YES (for firmware code only)
71 * Kernel is compiled with IBPB support: YES
72 * IBPB enabled and active: YES
74 * Kernel has branch predictor hardening (arm): NO
75 * Kernel compiled with retpoline option: YES
76 * Kernel compiled with a retpoline-aware compiler: YES (kernel reports full retpoline compilation)
77 > STATUS: NOT VULNERABLE (Full retpoline + IBPB are mitigating the vulnerability)
79 CVE-2017-5754 aka Variant 3, Meltdown, rogue data cache load
80 * Mitigated according to the /sys interface: YES (Not affected)
81 * Kernel supports Page Table Isolation (PTI): YES
82 * PTI enabled and active: NO
83 * Reduced performance impact of PTI: NO (PCID/INVPCID not supported, performance impact of PTI will be significant)
84 * Running as a Xen PV DomU: NO
85 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
87 CVE-2018-3640 aka Variant 3a, rogue system register read
88 * CPU microcode mitigates the vulnerability: YES
89 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
91 CVE-2018-3639 aka Variant 4, speculative store bypass
92 * Mitigated according to the /sys interface: YES (Mitigation: Speculative Store Bypass disabled via prctl and seccomp)
93 * Kernel supports disabling speculative store bypass (SSB): YES (found in /proc/self/status)
94 * SSB mitigation is enabled and active: YES (per-thread through prctl)
95 * SSB mitigation currently active for selected processes: YES (irqbalance systemd-journald systemd-logind systemd-networkd systemd-resolved systemd-timesyncd systemd-udevd)
96 > STATUS: NOT VULNERABLE (Mitigation: Speculative Store Bypass disabled via prctl and seccomp)
98 CVE-2018-3615 aka Foreshadow (SGX), L1 terminal fault
99 * CPU microcode mitigates the vulnerability: N/A
100 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
102 CVE-2018-3620 aka Foreshadow-NG (OS), L1 terminal fault
103 * Mitigated according to the /sys interface: YES (Not affected)
104 * Kernel supports PTE inversion: YES (found in kernel image)
105 * PTE inversion enabled and active: NO
106 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
108 CVE-2018-3646 aka Foreshadow-NG (VMM), L1 terminal fault
109 * Information from the /sys interface: Not affected
110 * This system is a host running a hypervisor: NO
112 * EPT is disabled: N/A (the kvm_intel module is not loaded)
114 * L1D flush is supported by kernel: YES (found flush_l1d in kernel image)
115 * L1D flush enabled: NO
116 * Hardware-backed L1D flush supported: NO (flush will be done in software, this is slower)
117 * Hyper-Threading (SMT) is enabled: YES
118 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
120 CVE-2018-12126 aka Fallout, microarchitectural store buffer data sampling (MSBDS)
121 * Mitigated according to the /sys interface: YES (Not affected)
122 * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image)
123 * Kernel mitigation is enabled and active: NO
124 * SMT is either mitigated or disabled: NO
125 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
127 CVE-2018-12130 aka ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)
128 * Mitigated according to the /sys interface: YES (Not affected)
129 * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image)
130 * Kernel mitigation is enabled and active: NO
131 * SMT is either mitigated or disabled: NO
132 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
134 CVE-2018-12127 aka RIDL, microarchitectural load port data sampling (MLPDS)
135 * Mitigated according to the /sys interface: YES (Not affected)
136 * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image)
137 * Kernel mitigation is enabled and active: NO
138 * SMT is either mitigated or disabled: NO
139 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
141 CVE-2019-11091 aka RIDL, microarchitectural data sampling uncacheable memory (MDSUM)
142 * Mitigated according to the /sys interface: YES (Not affected)
143 * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image)
144 * Kernel mitigation is enabled and active: NO
145 * SMT is either mitigated or disabled: NO
146 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
148 CVE-2019-11135 aka ZombieLoad V2, TSX Asynchronous Abort (TAA)
149 * Mitigated according to the /sys interface: YES (Not affected)
150 * TAA mitigation is supported by kernel: YES (found tsx_async_abort in kernel image)
151 * TAA mitigation enabled and active: NO
152 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
154 CVE-2018-12207 aka No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)
155 * Mitigated according to the /sys interface: YES (Not affected)
156 * This system is a host running a hypervisor: NO
157 * iTLB Multihit mitigation is supported by kernel: YES (found itlb_multihit in kernel image)
158 * iTLB Multihit mitigation enabled and active: NO
159 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
161 CVE-2020-0543 aka Special Register Buffer Data Sampling (SRBDS)
162 * Mitigated according to the /sys interface: YES (Not affected)
163 * SRBDS mitigation control is supported by the kernel: YES (found SRBDS implementation evidence in kernel image. Your kernel is up to date for SRBDS mitigation)
164 * SRBDS mitigation control is enabled and active: NO
165 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
167 > 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
171 Spectre and Meltdown mitigation detection tool v0.44+
173 Checking for vulnerabilities on current system
174 Kernel is Linux 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64
175 CPU is AMD EPYC 7532 32-Core Processor
178 * Hardware support (CPU microcode) for mitigation techniques
179 * Indirect Branch Restricted Speculation (IBRS)
180 * SPEC_CTRL MSR is available: YES
181 * CPU indicates IBRS capability: YES (IBRS_SUPPORT feature bit)
182 * CPU indicates preferring IBRS always-on: NO
183 * CPU indicates preferring IBRS over retpoline: YES
184 * Indirect Branch Prediction Barrier (IBPB)
185 * PRED_CMD MSR is available: YES
186 * CPU indicates IBPB capability: YES (IBPB_SUPPORT feature bit)
187 * Single Thread Indirect Branch Predictors (STIBP)
188 * SPEC_CTRL MSR is available: YES
189 * CPU indicates STIBP capability: YES (AMD STIBP feature bit)
190 * CPU indicates preferring STIBP always-on: NO
191 * Speculative Store Bypass Disable (SSBD)
192 * CPU indicates SSBD capability: YES (AMD SSBD in SPEC_CTRL)
193 * L1 data cache invalidation
194 * FLUSH_CMD MSR is available: NO
195 * CPU indicates L1D flush capability: NO
196 * CPU supports Transactional Synchronization Extensions (TSX): NO
197 * CPU supports Software Guard Extensions (SGX): NO
198 * CPU supports Special Register Buffer Data Sampling (SRBDS): NO
199 * CPU microcode is known to cause stability problems: NO (family 0x17 model 0x31 stepping 0x0 ucode 0x8301038 cpuid 0x830f10)
200 * CPU microcode is the latest known available version: NO (latest version is 0x830104d dated 2020/07/28 according to builtin firmwares DB v191+i20210217)
201 * CPU vulnerability to the speculative execution attack variants
202 * Affected by CVE-2017-5753 (Spectre Variant 1, bounds check bypass): YES
203 * Affected by CVE-2017-5715 (Spectre Variant 2, branch target injection): YES
204 * Affected by CVE-2017-5754 (Variant 3, Meltdown, rogue data cache load): NO
205 * Affected by CVE-2018-3640 (Variant 3a, rogue system register read): NO
206 * Affected by CVE-2018-3639 (Variant 4, speculative store bypass): YES
207 * Affected by CVE-2018-3615 (Foreshadow (SGX), L1 terminal fault): NO
208 * Affected by CVE-2018-3620 (Foreshadow-NG (OS), L1 terminal fault): NO
209 * Affected by CVE-2018-3646 (Foreshadow-NG (VMM), L1 terminal fault): NO
210 * Affected by CVE-2018-12126 (Fallout, microarchitectural store buffer data sampling (MSBDS)): NO
211 * Affected by CVE-2018-12130 (ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)): NO
212 * Affected by CVE-2018-12127 (RIDL, microarchitectural load port data sampling (MLPDS)): NO
213 * Affected by CVE-2019-11091 (RIDL, microarchitectural data sampling uncacheable memory (MDSUM)): NO
214 * Affected by CVE-2019-11135 (ZombieLoad V2, TSX Asynchronous Abort (TAA)): NO
215 * Affected by CVE-2018-12207 (No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)): NO
216 * Affected by CVE-2020-0543 (Special Register Buffer Data Sampling (SRBDS)): NO
218 CVE-2017-5753 aka Spectre Variant 1, bounds check bypass
219 * Mitigated according to the /sys interface: YES (Mitigation: usercopy/swapgs barriers and __user pointer sanitization)
220 * Kernel has array_index_mask_nospec: YES (1 occurrence(s) found of x86 64 bits array_index_mask_nospec())
221 * Kernel has the Red Hat/Ubuntu patch: NO
222 * Kernel has mask_nospec64 (arm64): NO
223 * Kernel has array_index_nospec (arm64): NO
224 > STATUS: NOT VULNERABLE (Mitigation: usercopy/swapgs barriers and __user pointer sanitization)
226 CVE-2017-5715 aka Spectre Variant 2, branch target injection
227 * Mitigated according to the /sys interface: YES (Mitigation: Full AMD retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling)
229 * Kernel is compiled with IBRS support: YES
230 * IBRS enabled and active: YES (for firmware code only)
231 * Kernel is compiled with IBPB support: YES
232 * IBPB enabled and active: YES
234 * Kernel has branch predictor hardening (arm): NO
235 * Kernel compiled with retpoline option: YES
236 * Kernel compiled with a retpoline-aware compiler: YES (kernel reports full retpoline compilation)
237 > STATUS: NOT VULNERABLE (Full retpoline + IBPB are mitigating the vulnerability)
239 CVE-2017-5754 aka Variant 3, Meltdown, rogue data cache load
240 * Mitigated according to the /sys interface: YES (Not affected)
241 * Kernel supports Page Table Isolation (PTI): YES
242 * PTI enabled and active: UNKNOWN (dmesg truncated, please reboot and relaunch this script)
243 * Reduced performance impact of PTI: NO (PCID/INVPCID not supported, performance impact of PTI will be significant)
244 * Running as a Xen PV DomU: NO
245 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
247 CVE-2018-3640 aka Variant 3a, rogue system register read
248 * CPU microcode mitigates the vulnerability: YES
249 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
251 CVE-2018-3639 aka Variant 4, speculative store bypass
252 * Mitigated according to the /sys interface: YES (Mitigation: Speculative Store Bypass disabled via prctl and seccomp)
253 * Kernel supports disabling speculative store bypass (SSB): YES (found in /proc/self/status)
254 * SSB mitigation is enabled and active: YES (per-thread through prctl)
255 * SSB mitigation currently active for selected processes: YES (irqbalance systemd-journald systemd-logind systemd-networkd systemd-resolved systemd-timesyncd systemd-udevd)
256 > STATUS: NOT VULNERABLE (Mitigation: Speculative Store Bypass disabled via prctl and seccomp)
258 CVE-2018-3615 aka Foreshadow (SGX), L1 terminal fault
259 * CPU microcode mitigates the vulnerability: N/A
260 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
262 CVE-2018-3620 aka Foreshadow-NG (OS), L1 terminal fault
263 * Mitigated according to the /sys interface: YES (Not affected)
264 * Kernel supports PTE inversion: YES (found in kernel image)
265 * PTE inversion enabled and active: NO
266 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
268 CVE-2018-3646 aka Foreshadow-NG (VMM), L1 terminal fault
269 * Information from the /sys interface: Not affected
270 * This system is a host running a hypervisor: NO
272 * EPT is disabled: N/A (the kvm_intel module is not loaded)
274 * L1D flush is supported by kernel: YES (found flush_l1d in kernel image)
275 * L1D flush enabled: NO
276 * Hardware-backed L1D flush supported: NO (flush will be done in software, this is slower)
277 * Hyper-Threading (SMT) is enabled: YES
278 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
280 CVE-2018-12126 aka Fallout, microarchitectural store buffer data sampling (MSBDS)
281 * Mitigated according to the /sys interface: YES (Not affected)
282 * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image)
283 * Kernel mitigation is enabled and active: NO
284 * SMT is either mitigated or disabled: NO
285 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
287 CVE-2018-12130 aka ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)
288 * Mitigated according to the /sys interface: YES (Not affected)
289 * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image)
290 * Kernel mitigation is enabled and active: NO
291 * SMT is either mitigated or disabled: NO
292 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
294 CVE-2018-12127 aka RIDL, microarchitectural load port data sampling (MLPDS)
295 * Mitigated according to the /sys interface: YES (Not affected)
296 * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image)
297 * Kernel mitigation is enabled and active: NO
298 * SMT is either mitigated or disabled: NO
299 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
301 CVE-2019-11091 aka RIDL, microarchitectural data sampling uncacheable memory (MDSUM)
302 * Mitigated according to the /sys interface: YES (Not affected)
303 * Kernel supports using MD_CLEAR mitigation: YES (found md_clear implementation evidence in kernel image)
304 * Kernel mitigation is enabled and active: NO
305 * SMT is either mitigated or disabled: NO
306 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
308 CVE-2019-11135 aka ZombieLoad V2, TSX Asynchronous Abort (TAA)
309 * Mitigated according to the /sys interface: YES (Not affected)
310 * TAA mitigation is supported by kernel: YES (found tsx_async_abort in kernel image)
311 * TAA mitigation enabled and active: NO
312 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
314 CVE-2018-12207 aka No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)
315 * Mitigated according to the /sys interface: YES (Not affected)
316 * This system is a host running a hypervisor: NO
317 * iTLB Multihit mitigation is supported by kernel: YES (found itlb_multihit in kernel image)
318 * iTLB Multihit mitigation enabled and active: NO
319 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
321 CVE-2020-0543 aka Special Register Buffer Data Sampling (SRBDS)
322 * Mitigated according to the /sys interface: YES (Not affected)
323 * SRBDS mitigation control is supported by the kernel: YES (found SRBDS implementation evidence in kernel image. Your kernel is up to date for SRBDS mitigation)
324 * SRBDS mitigation control is enabled and active: NO
325 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
327 > 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