@SoniX:
Are you sure? Intel's microcode-update-guidance.pdf document lists 0x24 as the first Meltdown/Spectre microcode for Haswell 306C3.

@SoniX, @Fernando, @All

Guys i can confirm that CPU Micro-Code Rev. 25 for Haswell CPUs is not working correctly and when integrated into BIOSes the machine can't boot, so STAY AWAY FROM REV. 25 CPU MICRO-CODE FOR HASWELL!!

Cheers,
KK

Zitat von killkernel im Beitrag #4052

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Guys i can confirm that CPU Micro-Code Rev. 25 for Haswell CPUs is not working correctly and when integrated into BIOSes the machine can't boot, so STAY AWAY FROM REV. 25 CPU MICRO-CODE FOR HASWELL!!

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1. A pre-Spectre version, with the latest pre-Spectre Intel microcode updates.
2. A post-Spectre version, with the latest and supposedly working Intel microcode patches for Meltdown and Spectre. Obviously this post-Spectre version of the UEFI BIOS Updater should be for the faint of heart.

1. Microsoft, via Windows updates, is protecting all Windows OS versions from Meltdown.
2. Presently there are no known "in the wild" exploits of Spectre. My caveat: Just because no Spectre expoits have been detected, this does not mean that they do not exist, and this does not mean that Spectre exploits may be embedded inside newly downloaded programs. The upshot is to be very careful of what programs you choose to download and install.

• Given the present situation that Intel has obviously not thoroughly tested its microcode updates which are meant to prevent Meltdown and Spectre CPU vulnerabilities, everyone should be very careful about applying any late 2017 and 2018 BIOS microcode updates.

CPU Micro-Code Rev. 25 for Haswell CPU works without problems.

Zitat von Maison1 im Beitrag #4054

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CPU Micro-Code Rev. 25 for Haswell CPU works without problems.

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!!! Important !!!
Do not update the microcode in UBU 1.70 b2/b5. The problem is found, we will fix UEFIReplace.

As an option, turn on MMTool, screenshots were before.

Add:
Update 0x25 with MMTool

@Maison1:
Glad to hear that for you all went smoothly but in my case i've used UEFI BIOS Updater Update V.1.70 B5 Dev and got no POST after BIOS flash…

@SoniX:
OK SoniX and thanks a lot for your hard work.

Cheers,
KK

I installed manually CPU Micro-Code Rev. 25 by MMTool...no problem.

Haswell CPU Micro-Code Rev. 25 brings hardware support for CVE-2018-3639

Speculation control settings for CVE-2018-3639 [speculative store bypass]

Hardware is vulnerable to speculative store bypass: True
Hardware support for speculative store bypass mitigation is present: True
Windows OS support for speculative store bypass mitigation is present: True
Windows OS support for speculative store bypass mitigation is enabled system-wide: False

The last vulnerability : https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3640

It's 4D microcode for Skylake-X, for Haswell, not microcode available ?

Not sure, SpeculationControl 1.0.8 does not report about CVE-2018-3640 (yet)

CPU Micro-Code Rev. 25 for Haswell CPU works without problems.

Asus Rampage VI Extreme
Model : 1401
Update : OK
After flashing : Brick

It's ok if the code is modified

http://dlcdnet.asus.com/pub/ASUS/mb/LGA2...E-ASUS-1401.zip

My result:
UBU v1.70 b6
- Asus Z87M-Plus 1107
- Update mCode: Ok
- After flahimg: Work