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 17:27:25 UTC 2021 aarch64
18 * CPU vulnerability to the speculative execution attack variants
19 * Affected by CVE-2017-5753 (Spectre Variant 1, bounds check bypass): YES
20 * Affected by CVE-2017-5715 (Spectre Variant 2, branch target injection): YES
21 * Affected by CVE-2017-5754 (Variant 3, Meltdown, rogue data cache load): NO
22 * Affected by CVE-2018-3640 (Variant 3a, rogue system register read): NO
23 * Affected by CVE-2018-3639 (Variant 4, speculative store bypass): YES
24 * Affected by CVE-2018-3615 (Foreshadow (SGX), L1 terminal fault): NO
25 * Affected by CVE-2018-3620 (Foreshadow-NG (OS), L1 terminal fault): NO
26 * Affected by CVE-2018-3646 (Foreshadow-NG (VMM), L1 terminal fault): NO
27 * Affected by CVE-2018-12126 (Fallout, microarchitectural store buffer data sampling (MSBDS)): NO
28 * Affected by CVE-2018-12130 (ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)): NO
29 * Affected by CVE-2018-12127 (RIDL, microarchitectural load port data sampling (MLPDS)): NO
30 * Affected by CVE-2019-11091 (RIDL, microarchitectural data sampling uncacheable memory (MDSUM)): NO
31 * Affected by CVE-2019-11135 (ZombieLoad V2, TSX Asynchronous Abort (TAA)): NO
32 * Affected by CVE-2018-12207 (No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)): NO
33 * Affected by CVE-2020-0543 (Special Register Buffer Data Sampling (SRBDS)): NO
35 CVE-2017-5753 aka Spectre Variant 1, bounds check bypass
36 * Mitigated according to the /sys interface: YES (Mitigation: __user pointer sanitization)
37 * Kernel has array_index_mask_nospec: NO
38 * Kernel has the Red Hat/Ubuntu patch: NO
39 * Kernel has mask_nospec64 (arm64): NO
40 * Kernel has array_index_nospec (arm64): NO
41 * Checking count of LFENCE instructions following a jump in kernel... NO (only 0 jump-then-lfence instructions found, should be >= 30 (heuristic))
42 > STATUS: NOT VULNERABLE (Mitigation: __user pointer sanitization)
44 CVE-2017-5715 aka Spectre Variant 2, branch target injection
45 * Mitigated according to the /sys interface: NO (Vulnerable)
47 * Kernel is compiled with IBRS support: YES
48 * IBRS enabled and active: NO
49 * Kernel is compiled with IBPB support: NO
50 * IBPB enabled and active: NO
52 * Kernel has branch predictor hardening (arm): YES
53 * Kernel compiled with retpoline option: NO
54 > STATUS: NOT VULNERABLE (Branch predictor hardening mitigates the vulnerability)
56 CVE-2017-5754 aka Variant 3, Meltdown, rogue data cache load
57 * Mitigated according to the /sys interface: YES (Not affected)
58 * Kernel supports Page Table Isolation (PTI): YES
59 * PTI enabled and active: UNKNOWN (dmesg truncated, please reboot and relaunch this script)
60 * Reduced performance impact of PTI: NO (PCID/INVPCID not supported, performance impact of PTI will be significant)
61 * Running as a Xen PV DomU: NO
62 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
64 CVE-2018-3640 aka Variant 3a, rogue system register read
65 * CPU microcode mitigates the vulnerability: NO
66 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
68 CVE-2018-3639 aka Variant 4, speculative store bypass
69 * Mitigated according to the /sys interface: NO (Vulnerable)
70 * Kernel supports disabling speculative store bypass (SSB): YES (found in /proc/self/status)
71 * SSB mitigation is enabled and active: NO
72 > STATUS: VULNERABLE (Your CPU doesnt support SSBD)
74 CVE-2018-3615 aka Foreshadow (SGX), L1 terminal fault
75 * CPU microcode mitigates the vulnerability: N/A
76 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
78 CVE-2018-3620 aka Foreshadow-NG (OS), L1 terminal fault
79 * Mitigated according to the /sys interface: YES (Not affected)
80 * Kernel supports PTE inversion: NO
81 * PTE inversion enabled and active: NO
82 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
84 CVE-2018-3646 aka Foreshadow-NG (VMM), L1 terminal fault
85 * Information from the /sys interface: Not affected
86 * This system is a host running a hypervisor: NO
88 * EPT is disabled: N/A (the kvm_intel module is not loaded)
90 * L1D flush is supported by kernel: NO
91 * L1D flush enabled: NO
92 * Hardware-backed L1D flush supported: NO (flush will be done in software, this is slower)
93 * Hyper-Threading (SMT) is enabled: UNKNOWN
94 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
96 CVE-2018-12126 aka Fallout, microarchitectural store buffer data sampling (MSBDS)
97 * Mitigated according to the /sys interface: YES (Not affected)
98 * Kernel supports using MD_CLEAR mitigation: NO
99 * Kernel mitigation is enabled and active: NO
100 * SMT is either mitigated or disabled: NO
101 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
103 CVE-2018-12130 aka ZombieLoad, microarchitectural fill buffer data sampling (MFBDS)
104 * Mitigated according to the /sys interface: YES (Not affected)
105 * Kernel supports using MD_CLEAR mitigation: NO
106 * Kernel mitigation is enabled and active: NO
107 * SMT is either mitigated or disabled: NO
108 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
110 CVE-2018-12127 aka RIDL, microarchitectural load port data sampling (MLPDS)
111 * Mitigated according to the /sys interface: YES (Not affected)
112 * Kernel supports using MD_CLEAR mitigation: NO
113 * Kernel mitigation is enabled and active: NO
114 * SMT is either mitigated or disabled: NO
115 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
117 CVE-2019-11091 aka RIDL, microarchitectural data sampling uncacheable memory (MDSUM)
118 * Mitigated according to the /sys interface: YES (Not affected)
119 * Kernel supports using MD_CLEAR mitigation: NO
120 * Kernel mitigation is enabled and active: NO
121 * SMT is either mitigated or disabled: NO
122 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
124 CVE-2019-11135 aka ZombieLoad V2, TSX Asynchronous Abort (TAA)
125 * Mitigated according to the /sys interface: YES (Not affected)
126 * TAA mitigation is supported by kernel: YES (found tsx_async_abort in kernel image)
127 * TAA mitigation enabled and active: NO
128 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
130 CVE-2018-12207 aka No eXcuses, iTLB Multihit, machine check exception on page size changes (MCEPSC)
131 * Mitigated according to the /sys interface: YES (Not affected)
132 * This system is a host running a hypervisor: NO
133 * iTLB Multihit mitigation is supported by kernel: YES (found itlb_multihit in kernel image)
134 * iTLB Multihit mitigation enabled and active: NO
135 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
137 CVE-2020-0543 aka Special Register Buffer Data Sampling (SRBDS)
138 * Mitigated according to the /sys interface: YES (Not affected)
139 * SRBDS mitigation control is supported by the kernel: NO
140 * SRBDS mitigation control is enabled and active: NO
141 > STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
143 > SUMMARY: CVE-2017-5753:OK CVE-2017-5715:OK CVE-2017-5754:OK CVE-2018-3640:OK CVE-2018-3639:KO 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