peter/spectre-meltdown-checker
1
0
Fork 0
mirror of https://github.com/speed47/spectre-meltdown-checker.git synced 2026-04-01 12:47:07 +02:00
Code Issues Projects Releases Wiki Activity

chore: readme: add a second table one about impact/mitigation

Browse Source 
built from commit b74adb0957c471014dce284b2b6bf8cad85edf38
 dated 2026-03-31 22:57:00 +0200
 by Stéphane Lesimple (speed47_github@speed47.net)
This commit is contained in:
github-actions[bot]
2026-03-31 21:43:28 +00:00
parent fe55c70658
commit 6663b6422e
2 changed files with 60 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

82
README.md
View File

@@ -3,29 +3,65 @@ Spectre & Meltdown Checker
A shell script to assess your system's resilience against the several [transient execution](https://en.wikipedia.org/wiki/Transient_execution_CPU_vulnerability) CVEs that were published since early 2018, and give you guidance as to how to mitigate them. A shell script to assess your system's resilience against the several [transient execution](https://en.wikipedia.org/wiki/Transient_execution_CPU_vulnerability) CVEs that were published since early 2018, and give you guidance as to how to mitigate them.
CVE | Name | Aliases | Impact | Mitigation CVE | Name | Aliases
--- | ---- | ------- | ------ | ---------- --- | ---- | -------
[CVE-2017-5753](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5753) | Bounds Check Bypass | Spectre V1 | Kernel & userspace | Recompile everything with LFENCE [CVE-2017-5753](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5753) | Bounds Check Bypass | Spectre V1
[CVE-2017-5715](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715) | Branch Target Injection | Spectre V2 | Kernel | Microcode + kernel update (or retpoline) [CVE-2017-5715](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715) | Branch Target Injection | Spectre V2
[CVE-2017-5754](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5754) | Rogue Data Cache Load | Meltdown | Kernel | Kernel update [CVE-2017-5754](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5754) | Rogue Data Cache Load | Meltdown
[CVE-2018-3640](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3640) | Rogue System Register Read | Variant 3a | Kernel | Microcode update [CVE-2018-3640](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3640) | Rogue System Register Read | Variant 3a
[CVE-2018-3639](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3639) | Speculative Store Bypass | Variant 4, SSB | JIT software | Microcode + kernel update [CVE-2018-3639](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3639) | Speculative Store Bypass | Variant 4, SSB
[CVE-2018-3615](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3615) | L1 Terminal Fault | Foreshadow (SGX) | SGX enclaves | Microcode update [CVE-2018-3615](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3615) | L1 Terminal Fault | Foreshadow (SGX)
[CVE-2018-3620](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3620) | L1 Terminal Fault | Foreshadow-NG (OS/SMM) | Kernel | Kernel update [CVE-2018-3620](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3620) | L1 Terminal Fault | Foreshadow-NG (OS/SMM)
[CVE-2018-3646](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3646) | L1 Terminal Fault | Foreshadow-NG (VMM) | Hypervisors | Kernel update (or disable EPT/SMT) [CVE-2018-3646](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3646) | L1 Terminal Fault | Foreshadow-NG (VMM)
[CVE-2018-12126](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12126) | Microarchitectural Store Buffer Data Sampling | MSBDS, Fallout | Kernel | Microcode + kernel update [CVE-2018-12126](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12126) | Microarchitectural Store Buffer Data Sampling | MSBDS, Fallout
[CVE-2018-12130](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12130) | Microarchitectural Fill Buffer Data Sampling | MFBDS, ZombieLoad | Kernel | Microcode + kernel update [CVE-2018-12130](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12130) | Microarchitectural Fill Buffer Data Sampling | MFBDS, ZombieLoad
[CVE-2018-12127](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12127) | Microarchitectural Load Port Data Sampling | MLPDS, RIDL | Kernel | Microcode + kernel update [CVE-2018-12127](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12127) | Microarchitectural Load Port Data Sampling | MLPDS, RIDL
[CVE-2019-11091](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11091) | Microarchitectural Data Sampling Uncacheable Memory | MDSUM, RIDL | Kernel | Microcode + kernel update [CVE-2019-11091](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11091) | Microarchitectural Data Sampling Uncacheable Memory | MDSUM, RIDL
[CVE-2019-11135](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11135) | TSX Asynchronous Abort | TAA, ZombieLoad V2 | Kernel | Microcode + kernel update [CVE-2019-11135](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11135) | TSX Asynchronous Abort | TAA, ZombieLoad V2
[CVE-2018-12207](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12207) | Machine Check Exception on Page Size Changes | iTLB Multihit, No eXcuses | Hypervisors | Hypervisor update (or disable hugepages) [CVE-2018-12207](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12207) | Machine Check Exception on Page Size Changes | iTLB Multihit, No eXcuses
[CVE-2020-0543](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0543) | Special Register Buffer Data Sampling | SRBDS, CROSSTalk | Kernel & userspace | Microcode + kernel update [CVE-2020-0543](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0543) | Special Register Buffer Data Sampling | SRBDS, CROSSTalk
[CVE-2022-40982](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40982) | Gather Data Sampling | Downfall, GDS | Kernel & userspace | Microcode update (or disable AVX) [CVE-2022-40982](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40982) | Gather Data Sampling | Downfall, GDS
[CVE-2023-20569](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20569) | Return Address Security | Inception, SRSO | Kernel & userspace | Microcode + kernel update [CVE-2023-20569](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20569) | Return Address Security | Inception, SRSO
[CVE-2023-20593](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20593) | Cross-Process Information Leak | Zenbleed | Kernel & userspace | Microcode update (or kernel workaround) [CVE-2023-20593](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20593) | Cross-Process Information Leak | Zenbleed
[CVE-2023-23583](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-23583) | Redundant Prefix Issue | Reptar | Kernel & userspace | Microcode update [CVE-2023-23583](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-23583) | Redundant Prefix Issue | Reptar
[CVE-2024-36350](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-36350) | Transient Scheduler Attack, Store Queue | TSA-SQ | Kernel & userspace | Microcode + kernel update [CVE-2024-36350](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-36350) | Transient Scheduler Attack, Store Queue | TSA-SQ
[CVE-2024-36357](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-36357) | Transient Scheduler Attack, L1 | TSA-L1 | Kernel & userspace | Microcode + kernel update [CVE-2024-36357](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-36357) | Transient Scheduler Attack, L1 | TSA-L1
## Am I at risk?
Depending on your situation, the table below answers whether an attacker in a given position can extract data from a given target.
The "Userland → Kernel" column also applies within a VM (VM userland vs. VM kernel), since the same CPU mechanisms are at play regardless of virtualization.
Vulnerability | Userland → Kernel | Userland → Userland | VM → Host | VM → VM
------------ | :---------------: | :-----------------: | :-------: | :-----:
CVE-2017-5753 (Spectre V1) | 💥 | 💥 | 💥 | 💥
CVE-2017-5715 (Spectre V2) | 💥 | 💥 | 💥 | 💥
CVE-2017-5754 (Meltdown) | 💥 | ✅ | ✅ | ✅
CVE-2018-3640 (Variant 3a) | 💥 | ✅ | ✅ | ✅
CVE-2018-3639 (Variant 4, SSB) | ✅ | 💥 | ✅ | ✅
CVE-2018-3615 (Foreshadow, SGX) | ✅ | ✅ | ✅ | ✅
CVE-2018-3620 (Foreshadow-NG, OS/SMM) | 💥 | ✅ | ✅ | ✅
CVE-2018-3646 (Foreshadow-NG, VMM) | ✅ | ✅ | 💥 | 💥
CVE-2018-12126 (MSBDS, Fallout) | 💥 | 💥 † | 💥 | 💥 †
CVE-2018-12130 (MFBDS, ZombieLoad) | 💥 | 💥 † | 💥 | 💥 †
CVE-2018-12127 (MLPDS, RIDL) | 💥 | 💥 † | 💥 | 💥 †
CVE-2019-11091 (MDSUM, RIDL) | 💥 | 💥 † | 💥 | 💥 †
CVE-2019-11135 (TAA, ZombieLoad V2) | 💥 | 💥 † | 💥 | 💥 †
CVE-2018-12207 (iTLB Multihit, No eXcuses) | ✅ | ✅ | ☠️ | ✅
CVE-2020-0543 (SRBDS, CROSSTalk) | 💥 ‡ | 💥 ‡ | 💥 ‡ | 💥 ‡
CVE-2022-40982 (Downfall, GDS) | 💥 | 💥 | 💥 | 💥
CVE-2023-20569 (Inception, SRSO) | 💥 | ✅ | 💥 | ✅
CVE-2023-20593 (Zenbleed) | 💥 | 💥 | 💥 | 💥
CVE-2023-23583 (Reptar) | ☠️ | ☠️ | ☠️ | ☠️
CVE-2024-36350 (TSA-SQ) | 💥 | 💥 † | 💥 | 💥 †
CVE-2024-36357 (TSA-L1) | 💥 | 💥 † | 💥 | 💥 †
> 💥 Data can be leaked across this boundary.
> ✅ Not affected in this scenario.
> ☠️ Denial of service (system crash or unpredictable behavior), no data leak.
> † Cross-process leakage requires SMT (Hyper-Threading) to be active — attacker and victim must share a physical core.
> ‡ Only leaks RDRAND/RDSEED output, not arbitrary memory; still allows recovering cryptographic material from any victim.
> CVE-2018-3615 (Foreshadow SGX) inverts the normal trust model: the OS reads SGX enclave data. It is irrelevant unless the system runs SGX enclaves, and the attacker must already have OS-level access.
<details> <details>
<summary>Detailed CVE descriptions</summary> <summary>Detailed CVE descriptions</summary>

2
spectre-meltdown-checker.sh
View File

@@ -13,7 +13,7 @@
# #
# Stephane Lesimple # Stephane Lesimple
# #
VERSION='26.21.0331873' VERSION='26.21.0331902'
# --- Common paths and basedirs --- # --- Common paths and basedirs ---
readonly VULN_SYSFS_BASE="/sys/devices/system/cpu/vulnerabilities" readonly VULN_SYSFS_BASE="/sys/devices/system/cpu/vulnerabilities"