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Some Dell systems that use some models of Intel CPUs are susceptible to hangs
and system instability during or after microcode update to revision 0xc6/0xca
(included as part of microcode-20191113/microcode-20191115 update that addressed
CVE-2019-0117, CVE-2019-0123, CVE-2019-11135, and CVE-2019-11139)
and/or revision 0xd6 (included as part of microcode-20200609 update
that addressed CVE-2020-0543, CVE-2020-0548, and CVE-2020-0549)
[1][2][3][4][5][6].  In order to address this, microcode update to the newer
revision has been disabled by default on these systems, and the previously
published microcode revisions 0xae/0xb4/0xb8 are used by default
for the OS-driven microcode update.

[1] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/23
[2] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/24
[3] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/33
[4] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/34
[5] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/35
[6] https://bugzilla.redhat.com/show_bug.cgi?id=1846097

This caveat contains latest microcode revisions publicly released by Intel;
for the revision 0xca of the microcode files, please refer to caveat
06-8e-9e-0x-0xca.

For the reference, microarchitectures of the affected CPU models:
 * Amber Lake-Y
 * Kaby Lake-G/H/S/U/X/Y/Xeon E3
 * Coffee Lake-H/S/U/Xeon E
 * Comet Lake-U 4+2
 * Whiskey Lake-U

Family names of the affected CPU models:
 * 7th Generation Intel® Core™ Processor Family
 * 8th Generation Intel® Core™ Processor Family
 * 9th Generation Intel® Core™ Processor Family
 * 10th Generation Intel® Core™ Processor Family (selected models)
 * Intel® Celeron® Processor G Series
 * Intel® Celeron® Processor 5000 Series
 * Intel® Core™ X-series Processors (i7-7740X, i5-7640X only)
 * Intel® Pentium® Gold Processor Series
 * Intel® Pentium® Processor Series (selected models)
 * Intel® Xeon® Processor E Family
 * Intel® Xeon® Processor E3 v6 Family

SHA1 checksums of the microcode files containing microcode revisions
in question:
 * 06-8e-09, revision 0xb4: e253c95c29c3eef6576db851dfa069d82a91256f
 * 06-8e-0a, revision 0xb4: 45bcba494be07df9eeccff9627578095a97fba4d
 * 06-8e-0b, revision 0xb8: 3e54bf91d642ad81ff07fe274d0cfb5d10d09c43
 * 06-8e-0c, revision 0xb8: bf635c87177d6dc4e067ec11e1caeb19d3c325f0
 * 06-9e-09, revision 0xb4: 42f68eec4ddb79dd6be0c95c4ce60e514e4504b1
 * 06-9e-0a, revision 0xb4: 37c7cb394dd36610b57943578343723da67d50f0
 * 06-9e-0b, revision 0xb4: b5399109d0a5ce8f5fb623ff942da0322b438b95
 * 06-9e-0c, revision 0xae: 131bce89e4d210de8322ffbc6bd787f1af66a7df
 * 06-9e-0d, revision 0xb8: 22511b007d1df55558d115abb13a1c23ea398317

 * 06-8e-09, revision 0xca: 9afa1bae40995207afef13247f114be042d88083
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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-2022-21151 (Optimization Removal-Induced Informational Disclosure),
   CVE-2022-21166 (Device Register Partial Write):
   https://access.redhat.com/articles/6963124

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-06-8e-9e-0x-dell" 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-06-8e-9e-0x-dell
    /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-06-8e-9e-0x-dell",
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-06-8e-9e-dell
    /usr/libexec/microcode_ctl/update_ucode
    dracut -f --regenerate-all

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