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File Name : readme-intel-06-2d-07

Intel Sandy Bridge-E/EN/EP CPU models (SNB-EP, family 6, model 45, stepping 7)
had issues with MDS-related microcode update that may lead to a system hang
after a microcode update[1][2].  In order to address this, microcode update
to the MDS-related revision 0x718 had been disabled, and the previously
published microcode revision 0x714 is used by default for the OS-driven
microcode update.  The revision 0x71a of the microcode is intended to fix
the aforementioned issue, hence it is enabled by default (but can be disabled
explicitly; see below).

[1] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/15
[2] https://access.redhat.com/solutions/4593951

For the reference, SHA1 checksums of 06-2d-07 microcode files containing
microcode revisions in question are listed below:
 * 06-2d-07, revision 0x714: bcf2173cd3dd499c37defbc2533703cfa6ec2430
 * 06-2d-07, revision 0x718: 837cfebbfc09b911151dfd179082ad99cf87e85d
 * 06-2d-07, revision 0x71a: 4512c8149e63e5ed15f45005d7fb5be0041f66f6

Please contact your system vendor for a BIOS/firmware update that contains
the latest microcode version.  For the information regarding microcode versions
required for mitigating specific side-channel cache attacks, please refer
to the following knowledge base articles:
 * CVE-2017-5715 ("Spectre"):
   https://access.redhat.com/articles/3436091
 * CVE-2018-3639 ("Speculative Store Bypass"):
   https://access.redhat.com/articles/3540901
 * CVE-2018-3620, CVE-2018-3646 ("L1 Terminal Fault Attack"):
   https://access.redhat.com/articles/3562741
 * CVE-2018-12130, CVE-2018-12126, CVE-2018-12127, and CVE-2019-11091
   ("Microarchitectural Data Sampling"):
   https://access.redhat.com/articles/4138151

The information regarding disabling microcode update is provided below.

To disable usage of the newer microcode revision for a specific kernel
version, please create file "disallow-intel-06-2d-07" inside
/lib/firmware/<kernel_version> directory, run
"/usr/libexec/microcode_ctl/update_ucode" to add it to firmware directory
where microcode will be available for late microcode update, and run
"dracut -f --kver <kernel_version>", so initramfs for this kernel version
is regenerated and the microcode can be loaded early, for example:

touch /lib/firmware/3.10.0-862.9.1/disallow-intel-06-2d-07
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --kver 3.10.0-862.9.1

To avoid addition of the newer microcode revision for all kernels, please create
file "/etc/microcode_ctl/ucode_with_caveats/disallow-intel-06-2d-07", run
"/usr/libexec/microcode_ctl/update_ucode" for late microcode updates,
and "dracut -f --regenerate-all" for early microcode updates:

mkdir -p /etc/microcode_ctl/ucode_with_caveats
    touch /etc/microcode_ctl/ucode_with_caveats/disallow-intel-06-2d-07
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --regenerate-all

Please refer to /usr/share/doc/microcode_ctl/README.caveats for additional
information.

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-05-04 04:50:07
..	dir	-	root/root	0755	2026-05-06 06:37:52
intel-ucode	dir	-	root/root	0755	2026-05-04 04:50:07
readme-intel	text/plain	2.37 KB	root/root	0644	2026-05-04 04:50:03
readme-intel-06-2d-07	text/plain	2.91 KB	root/root	0644	2026-05-04 04:50:05
readme-intel-06-55-04	text/plain	5.32 KB	root/root	0644	2026-05-04 04:50:06
readme-intel-06-5e-03	text/plain	4.67 KB	root/root	0644	2026-05-04 04:50:07
readme-intel-06-8c-01	text/plain	3.31 KB	root/root	0644	2026-05-04 04:50:07

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