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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //usr/share/doc/microcode_ctl/caveats/06-55-04_readme

Intel Skylake Scalable Platform CPU models that belong to Workstation and HEDT
(Basin Falls) segment (SKL-W/X, family 6, model 85, stepping 4) had reports
of system hangs on reboot when revision 0x2000065 of microcode, that was included
from microcode-20191112 update up to microcode-20200520 update, was applied[1].
In order to address this, microcode update to the newer revision had been
disabled by default on these systems, and the previously published microcode
revision 0x2000064 is used by default for the OS-driven microcode update.

Since revision 0x2006906 (included with the microcode-20200609 release)
it is reported that the issue is no longer present, so the newer microcode
revision is enabled by default now (but can be disabled explicitly; see below).

[1] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/21

For the reference, SHA1 checksums of 06-55-04 microcode files containing
microcode revisions in question are listed below:
 * 06-55-04, revision 0x2000064: 2e405644a145de0f55517b6a9de118eec8ec1e5a
 * 06-55-04, revision 0x2000065: f27f12b9d53f492c297afd856cdbc596786fad23
 * 06-55-04, revision 0x2006906: 5f18f985f6d5ad369b5f6549b7f3ee55acaef967
 * 06-55-04, revision 0x2006a08: 4059fb1f60370297454177f63cd7cc20b3fa1212
 * 06-55-04, revision 0x2006a0a: 7ec27025329c82de9553c14a78733ad1013e5462
 * 06-55-04, revision 0x2006b06: cb5bec976cb9754e3a22ab6828b3262a8f9eccf7
 * 06-55-04, revision 0x2006c0a: 76b641375d136c08f5feb46aacebee40468ac085
 * 06-55-04, revision 0x2006d05: dc4207cf4eb916ff34acbdddc474db0df781234f
 * 06-55-04, revision 0x2006e05: bc67d247ad1c9a834bec5e452606db1381d6bc7e
 * 06-55-04, revision 0x2006f05: c47277a6a47caedb518f311ce5d339528a8347e2
 * 06-55-04, revision 0x2007006: 68ae0f321685ff97b50266bc20818f31563fc67c

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
 * CVE-2019-0117 (Intel SGX Information Leak),
   CVE-2019-0123 (Intel SGX Privilege Escalation),
   CVE-2019-11135 (TSX Asynchronous Abort),
   CVE-2019-11139 (Voltage Setting Modulation):
   https://access.redhat.com/solutions/2019-microcode-nov
 * CVE-2020-0543 (Special Register Buffer Data Sampling),
   CVE-2020-0548 (Vector Register Data Sampling),
   CVE-2020-0549 (L1D Cache Eviction Sampling):
   https://access.redhat.com/solutions/5142751
 * CVE-2020-8695 (Information disclosure issue in Intel SGX via RAPL interface),
   CVE-2020-8696 (Vector Register Leakage-Active),
   CVE-2020-8698 (Fast Forward Store Predictor):
   https://access.redhat.com/articles/5569051
 * CVE-2020-24489 (VT-d-related Privilege Escalation),
   CVE-2020-24511 (Improper Isolation of Shared Resources),
   CVE-2020-24512 (Observable Timing Discrepancy),
   CVE-2020-24513 (Information Disclosure on Some Intel Atom Processors):
   https://access.redhat.com/articles/6101171
 * CVE-2021-0127 (Intel Processor Breakpoint Control Flow):
   https://access.redhat.com/articles/6716541
 * CVE-2022-0005 (Informational disclosure via JTAG),
   CVE-2022-21123 (Shared Buffers Data Read),
   CVE-2022-21125 (Shared Buffers Data Sampling),
   CVE-2022-21127 (Update to Special Register Buffer Data Sampling),
   CVE-2022-21131 (Protected Processor Inventory Number (PPIN) access protection),
   CVE-2022-21136 (Overclocking service access protection),
   CVE-2022-21151 (Optimization Removal-Induced Informational Disclosure),
   CVE-2022-21166 (Device Register Partial Write):
   https://access.redhat.com/articles/6963124
 * CVE-2022-21233 (Stale Data Read from legacy xAPIC):
   https://access.redhat.com/articles/6976398

The information regarding disabling microcode update is provided below.

To disable usage of the newer microcode revision for a specific kernel
version, please create a file "disallow-intel-06-55-04" inside
/lib/firmware/<kernel_version> directory, run
"/usr/libexec/microcode_ctl/update_ucode" to update firmware directory
used for late microcode updates, and run "dracut -f --kver <kernel_version>"
so initramfs for this kernel version is regenerated, for example:

    touch /lib/firmware/3.10.0-862.9.1/disallow-intel-06-55-04
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --kver 3.10.0-862.9.1

To disable usage of the newer microcode revision for all kernels, please create
file "/etc/microcode_ctl/ucode_with_caveats/disallow-intel-06-55-04", run
"/usr/libexec/microcode_ctl/update_ucode" to update firmware directories
used for late microcode updates, and run "dracut -f --regenerate-all"
so initramfs images get regenerated, for example:

    mkdir -p /etc/microcode_ctl/ucode_with_caveats
    touch /etc/microcode_ctl/ucode_with_caveats/disallow-intel-06-55-04
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --regenerate-all

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

haha - 2025