5th Gen Intel® Xeon® Processor Scalable Family

Specification Update

ID Date Version Classification
793902 03/11/2026 Public

Errata Summary Table

Errata Summary Table for XCC/MCC Specific SKUs

Erratum ID Processor Stepping XCC A-1 Processor Stepping MCC R-1 Title
EMR1 No Fix No Fix IPSR May Not Function Correctly
EMR2 No Fix No Fix Poison Data Reported Instead of a CS Limit Violation
EMR3 No Fix No Fix Monitor Instructions to Legacy VGA Region May Fail
EMR4 No Fix No Fix TILEDATA State May Be Saved Incorrectly
EMR5 No Fix No Fix A Poison Data Event May Not be Serviced if a Data Breakpoint Occurs on an AMX Tile-Load or AVX Gather or REP MOVS Instruction
EMR6 No Fix No Fix IFS MSRs Will Ignore a Non-Zero EDX Value And Not Signal a #GP
EMR7 No Fix No Fix Processor May Signal Spurious #GP Fault
EMR8 No Fix No Fix A Break Point May be Hit Twice When a VM Exit Without Commit Occurs
EMR9 No Fix No Fix Faulted XRSTORS Instruction May Result in Unexpected X87 FTW Value
EMR10 No Fix No Fix Error Conditions Detected During Cold Reset May Not be Cleared by Subsequent Warm Reset
EMR11 No Fix No Fix DSA/IAX Does Not Log The E2E Prefix Bit And The Prefix-Type Bits in AERTLPPLOG1
EMR12 No Fix No Fix The Processor May Drop Noncompliant Posted Peer-to-peer Transactions
EMR13 No Fix No Fix Certain Bits in IA32_​MC5_​STATUS Register Will Always Return 0
EMR14 No Fix No Fix Occupancy Interrupt Handle is Not Checked Against Interrupt Table Size
EMR15 No Fix No Fix Processor May Incorrectly Set PFD Assisted in Correction Bit in Memory Controller
EMR16 No Fix No Fix DSA CMDSTATUS Register May Not Reflect Correct Hardware Status
EMR17 No Fix No Fix Remapping Hardware May Set Access/Dirty Bits in a First-stage Page-table Entry
EMR18 No Fix No Fix System Software May Not Receive VT-d Fault SPT.3 For Non-Zero Writes to b[191:HAW+128]
EMR19 No Fix No Fix APCTL.APNGE Should be RW Instead of RWS
EMR20 No Fix No Fix CXL Device May Not Receive Viral
EMR21 No Fix No Fix Removed
EMR22 No Fix No Fix Performance Monitoring Event Coherent_​ops May Undercount
EMR23 No Fix No Fix PCIe Link Re-Equalization May Not Occur if Link is in L1 State
EMR24 No Fix No Fix Machine Check Bank 4 UCNA Errors May Not be Signaled
EMR25 No Fix No Fix DSA/IAA Use of Priv and PASID
EMR26 No Fix No Fix Reserved(0) Check For a PASID Table Entry May Not Happen For a DMA Request
EMR27 No Fix No Fix Remapping Hardware May Not Generate a Page Request Group Response Message While Operating in Legacy Mode or Abort DMA Mode
EMR28 No Fix No Fix Remapping Hardware May Abort ZLR to Second-Stage Write Only Pages
EMR29 No Fix No Fix Remapping Hardware with Major Version Number 6 Incorrectly Advertises the ESRTPS Support
EMR30 No Fix No Fix Platform May Hang if System Software Sends a Page Group Response or DevTLB Invalidation to Non-existent Requester ID
EMR31 No Fix No Fix Remapping Hardware Does Not Perform Reserved (0) Check in Page Response Descriptor
EMR32 No Fix No Fix Remapping Hardware Implements b[31:16] of the three Event Data Registers (VTDBAR offsets 0x3C, 0xA4, and 0xE4) as Read-Writable
EMR33 No Fix No Fix IAA Do Not Report Overlap Errors For AECS Size of 2GB or Greater
EMR34 No Fix No Fix DSA/IAA Invalid TC Not Reported in The SWERROR Register
EMR35 No Fix No Fix IAA Unaligned Completion Record Address Error is Not Reported in SWERROR Register
EMR36 No Fix No Fix Intel® UPI Link Not Resetting When L1 Mismatch Occurs Between Local and Remote Sockets
EMR37 No Fix No Fix DSA/IAA May Fail to Log an MDPE Error For Back-to-Back Parity Errors
EMR38 No Fix No Fix Relaxed Ordering Not Disabled by DEVCTL.ERO bit for DSA/IAA Upstream Transactions
EMR39 No Fix No Fix System Address Logged For WDB Parity Errors May be Incorrect
EMR40 No Fix No Fix Incorrect MCACOD For L2 MCE
EMR41 No Fix No Fix System May Hang Due to Full LLRB
EMR42 No Fix No Fix IAA May Fail to Properly Decode Data With a Large Header
EMR43 No Fix No Fix Memory Controller Violates JEDEC RCD tCSALT Timing
EMR44 No Fix No Fix Address May Not be Logged For a UCR Error Detected in The MLC
EMR45 No Fix No Fix VT-d DMA Remapping Hardware May Hang if it Encounters Page Request Queue Overflow Condition
EMR46 No Fix No Fix Receiver Common Mode Input Impedance May be Below Specification When Interface is Powered Down
EMR47 No Fix No Fix Remapping Hardware Will Not Report The PASID Value For RTA.2 Faults in Modes Other Than Scalable Mode
EMR48 No Fix No Fix Remapping Hardware Does Not Perform a Reserved(0) Check in Interrupt Remap Table Entry
EMR49 No Fix No Fix Processor PCIe Root Port Link Spurious Data Parity Error May be Reported
EMR50 No Fix No Fix Mismatch Between UboxErrMisc and MCI_​STATUS Registers Error Logs
EMR51 No Fix No Fix CHA UCNA Errors May be Incorrectly Controlled by MCi_​CTL Enable Bits
EMR52 No Fix No Fix Reading The PPERF MSR May Not Return Correct Values
EMR53 No Fix No Fix No #GP Will be Signaled When Setting MSR_​MISC_​PWR_​MGMT.ENABLE_​SDC if MSR_​MISC_​PWR_​MGMT.LOCK is Set
EMR54 No Fix No Fix System May Experience an Internal Timeout Error When an Internal Parity Error Occurs While Working With Intel® AMX
EMR55 No Fix No Fix Last Branch Records May Not Survive Warm Reset
EMR56 No Fix No Fix Single Step on Branches Might be Missed When VMM Enables Notification On VM Exit
EMR57 No Fix No Fix Incorrect #CP Error Code on UIRET
EMR58 No Fix No Fix #GP May be Serviced Before an Instruction Breakpoint
EMR59 No Fix No Fix Unexpected #PF Exception Might Be Serviced Before a #GP Exception
EMR60 No Fix No Fix VMX-Preemption Timer May Not Work if Configured With a Value of 1
EMR61 No Fix No Fix User Interrupt Might be Delayed
EMR62 No Fix No Fix VM Exit Qualification May Not be Correctly Set on APIC Access While Serving a User Interrupt
EMR63 No Fix No Fix Software Tuning That Relies on PCLS Values May Experience Inaccurate Event Counts
EMR64 No Fix No Fix Multiple SGX_​Doorbell_​Errors on Ubox Response Mismatch
EMR65 No Fix No Fix Intel DSA/IAA Completion Record is Not Written For Non-Completion Record Invalid Traffic Classes
EMR66 No Fix No Fix Intel IAA Expand Operation With PRLE Format Input May Return an Error
EMR67 No Fix No Fix Intel IAA Compression with Compress Bit Order Set May Produce an Odd Number of Bytes
EMR68 No Fix No Fix Intel IAA Source 2 Not Written Properly When Source 2 Size is 32 Bytes
EMR69 No Fix No Fix Intel IAA May Not Report Invalid Filter Flags Status Code When Source 2 Bit Order Field is Set
EMR70 No Fix No Fix Intel IAA Does Not Allow Source 1 Size to be 0 For Expand Operation
EMR71 No Fix No Fix Intel® DSA/IAA And WQ Configuration Registers May be Incorrectly Updated
EMR72 No Fix No Fix Invalid Flags Field of The Completion Record May Not be Set Correctly For Intel IAA Compression Operation
EMR73 No Fix No Fix With Intel® SGX Disabled, Software That Relies on ENCLVexiting May Not Function as Expected
EMR74 No Fix No Fix Headers Logged in AERHDRLOG for an AER Error for Intel DSA/IAA may be Incorrect
EMR75 No Fix No Fix Intel DSA/IAA May Fail to Send an ERR_​FATAL Message if a Non-Fatal Error Occurs in The Same Cycle
EMR76 No Fix No Fix Intel DSA/IAA May Fail to Log an Unexpected Completion Error For an Invalid ATS Response
EMR77 No Fix No Fix Intel IAA Compression Output Buffer Overflow Error May be Incorrectly Reported
EMR78 No Fix No Fix Intel® QuickAssist Technology Accelerator May Violate ATS Invalidation Completion Ordering
EMR79 No Fix No Fix Intel® QuickAssist Technology Accelerator Device May Not Invalidate PASID SupervisorPrivilege Translations Privilege Translations
EMR80 Fixed Fixed The Time-Stamp Counter May Report an Incorrect Value
EMR81 No Fix No Fix UPI Machine Check Bank May Not Report The Most Recently Logged Error
EMR82 No Fix No Fix PECI Wire Host may Continuously Receive a Completion Code of 0x80
EMR83 No Fix No Fix DDR5 9x4 DIMMs ECS Data May be Reported Incorrectly
EMR84 No Fix No Fix RETRY_​RD_​ERR_​LOG_​MISC.DDR5_​9x4_​half_​device Bit Maybe Incorrect
EMR85 No Fix No Fix PIROM Reports The Wrong 2 DPC Speed For Processors With Less Than 4800 MT/s 1 DPC Speed
EMR86 No Fix No Fix An MDF Parity Error May Incorrect Set The Overflow Bit
EMR87 No Fix No Fix Incorrect FROM_​IP Value For an RTM Abort in BTM or BTS May be Observed
EMR88 No Fix No Fix CPUID Reports Incorrect Number of Ways For The Load DTLB
EMR89 No Fix No Fix Intel PT Trace May Contain Incorrect Data When Configured With Single Range Output Larger Than 4KB
EMR90 No Fix No Fix On Instructions Longer Than 15 Bytes, #GP Exception is Prioritized And Delivered Over #CP Exception
EMR91 No Fix No Fix Mismatch on DR6 Value When Breakpoint Match is on Bitmap Address
EMR92 No Fix No Fix RTM Abort Status May be Incorrect For INT1/INT3 Instructions
EMR93 No Fix No Fix WRMSR to Reserved Bits of IA32_​L3_​QOS_​Mask_​15 Will Not signal a #GP
EMR94 No Fix No Fix x87 FDP Value May be Saved Incorrectly
EMR95 No Fix No Fix Debug Exceptions May Be Lost or Misreported When MOV SS or POP SS Instruction is Not Followed By a Write to SP
EMR96 No Fix No Fix Exit Qualification For EPT Violations on Instruction Fetches May Incorrectly Indicate That The Guest-physical Address Was Writeable
EMR97 No Fix No Fix Processor May Generate Spurious Page Faults On Shadow Stack Pages
EMR98 No Fix No Fix Processor May Hang if Warm Reset Triggers During BIOS Initialization
EMR99 No Fix No Fix IA32_​MC1_​STATUS MSR May Not Log Errors When IA32_​MC1_​CTL MSR is Set to Not Signal Errors
EMR100 No Fix No Fix System May Hang When Bus-Lock Detection Is Enabled And EPT Resides in Uncacheable Memory
EMR101 No Fix No Fix OFFCORE_​REQUESTS_​OUTSTANDING Performance Monitoring Events May be Inaccurate
EMR102 No Fix No Fix Incorrect MCACOD For L2 Prefetch MCE
EMR103 No Fix No Fix Call Instruction Wrapping Around The 32-bit Address Boundary May Return to Incorrect Address
EMR104 No Fix No Fix ADDDC Reverse Sparing May Lead to Incorrect Data
EMR105 No Fix No Fix SGX ENCLU[EACCEPT] Will Not Cause #GP When TCS.PREVSPP is Non-zero
EMR106 No Fix No Fix Setting MISC_​FEATURE_​CONTROL.DISABLE_​THREE_​STRIKE_​CNT Does Not Prevent The Three-strike Counter From Incrementing
EMR107 No Fix No Fix Mismatch Between UboxErrMisc and MCI_​STATUS Registers Error Logs
EMR108 No Fix No Fix SST-TF May Fail to Report an Error if Turbo is Disabled
EMR109 No Fix No Fix Unexpected Rollover in MBM Counters
EMR110 No Fix No Fix System Crash Observed on Host When TD Private Pages Are Not Zeroed Out if Reused For Non-TD SW
EMR111 No Fix No Fix IA32_​MC2_​ADDR And IA32_​MC2_​MISC MSRs Will be Cleared on Warm Reset
EMR112 No Fix No Fix Multiple Write CRC Errors May Lead to System Hang
EMR113 No Fix No Fix Intel DSA/IAA CTO Errors May Inconsistently Update the Prefix Log and Prefix Log Present Flag
EMR114 No Fix No Fix RTIT_​CTL.TRACE_​EN May be Disabled at BIOS_​DONE Even if it Was Previously Enabled
EMR115 No Fix No Fix WRMSR to a Few Core MSRs Might be Overwritten
EMR116 No Fix No Fix Performance Monitoring Events used by TMA May be Inaccurate
EMR117 No Fix No Fix Performance Monitoring Event IDQ.MS_​UOPS May Undercount
EMR118 No Fix No Fix Scan At Field Scan Time Interval Violation Warning May be Reported Incorrectly
EMR119 No Fix No Fix ECS Reads May Fail to Complete in Certain Memory Configurations and Conditions
EMR120 No Fix No Fix A Write to The TSC_​Deadline MSR May Cause an Unexpected Timer Interrupt
EMR121 No Fix No Fix MSR_​UNC_​CBO_​CONFIG Register May Not Provide Correct Information
EMR122 No Fix No Fix Disabling The APIC While an Interrupt is Being Delivered May Cause a System Hang
EMR123 No Fix No Fix DSA or IAA May Cause Unpredictable System Behavior When Incorrectly Forwarded Data
EMR124 No Fix No Fix Unexpected System Software Behavior on Systems With Intel® Hyper-Threading Technology Enabled
EMR125 Moved to EMRLCC1
EMR126 No Fix No Fix PCIe Link Degradation Following a Leaky Bucket Event
EMR127 No Fix No Fix RTTO May Occur at Lower Link Speed And Reduce Link Width
EMR128 No Fix No Fix Intel® DSA DIF Insert and DIF Strip Operations Do Not Properly Check For Overlapping Buffers
EMR129 No Fix No Fix Remapping Hardware May Encounter Incorrect Error Code in Invalidation Queue Error Record Register
EMR130 No Fix No Fix Intel DSA Memory Write with Incorrect Parity May Result in a System Crash
EMR131 No Fix No Fix MCA not Logged for WbNoInvd Data ECC Errors
EMR132 No Fix No Fix WRMSR Instruction to MSR_​CORE_​BIST MSR May Overwrite AMX State on Both Threads
EMR133 Fixed Fixed Internal Timeout MCE May Occur on Systems with CXL I/O Devices
EMR134 Planned Fix Planned Fix A PCIe Device May Not Function After a Warm Reset
EMR135 No Fix No Fix DIMMs May Not be Placed in Self-Refresh Mode Prior to Warm Reset
EMR136 Fixed Fixed Intel® DSA Device May Hang
EMR137 Fixed Fixed VM Exit Following MOV to CR8 Instruction May Lead to Unexpected IDT Vectoring-Information
EMR138 No Fix No Fix Power May Be Displayed Incorrectly
EMR139 No Fix No Fix Processor May Hang When AMX_​OPS_​RETIRED PMON Event is Counted
EMR140 Fixed Fixed Internal Timer Machine Check Error May Cause System Hang
EMR141 No Fix No Fix PCIe TLP May be Lost After Link Down Event
EMR142 Fixed Fixed Processor Core May Fail to Transition From C0 to C6 C-State
EMR143 Fixed Fixed CPUID Returns Invalid Level Type
EMR144 No Fix No Fix Write to UNCORE_​RATIO_​LIMIT May Not Take Effect
EMR145 Fixed Fixed Memory Uncorrectable Error With Multiple Ranks on a Channel
EMR146 Fixed Fixed A Processor May Run at a Fixed Mesh Frequency
EMR147 Fixed Fixed REP SCASB or REP CMPSB Instructions May Return Incorrect Results
EMR148 No Fix No Fix Incorrect Last Branch From Value in BTS Branch Record During a Task Switch
EMR149 No Fix No Fix Intel® PT Incorrect CR3-Filtering
EMR150 No Fix No Fix Intel® SST-PP Limited to Config-TDP Level 0 When PPL1 and PPL2 Are Not Set
EMR151 No Fix No Fix Performance Monitoring Event MEMORY_​ACTIVITY.STALLS_​L2_​MISS May Undercount
EMR152 No Fix No Fix Certain VMCS Fields May be Incorrect During STM to VMX Transitions
EMR153 No Fix No Fix Instruction Timeout VM Exit Will Not Set Guest RFLAGS.RF During #UD
EMR154 No Fix No Fix VMREAD/VMWRITE Instructions May Not Fail When Accessing an Unsupported Field in VMCS
EMR155 Fixed Fixed MPX_​FUSE_​OVERRIDE Register May Trigger General Protection Fault

Errata Summary Table for LCC Specific SKUs

Erratum ID / Internal Reference Number Processor Stepping LCC U-1 Title
EMRLCC1 / 14018613925 No Fix Certain PCIe* Devices Are Not Accessible Out-of-Band With Local Bus Number

Notes:

  1. See the following for full 4th Gen Intel® Xeon® processor XCC/MCC content:

    4th Gen Intel® Xeon® Processor Scalable Family Specification Update, document number 772415.

Specification Changes

Number Specification Changes
SCH1 Intel® Scalable IOV for Intel® DSA and Intel® IAA is Defeatured

Specification Clarifications

No. Specification Clarifications
EMRXX None for this revision of this specification update.

Documentation Changes

No. Documentation Changes
EMRXX None for this revision of the specification update.