Stale Translation Lookaside Buffer (TLB) Entry Vulnerability
Summary
An internally reported microcode bug in some EPYC™ AMD CPUs could allow a local admin-privileged attacker to run SEV-SNP (Secure Encrypted Virtualization - Secure Nested Paging) guests using stale TLB entries.
This bug could allow SNP active vCPUs to reuse TLB entries from other virtual machines (VMs), potentially compromising data integrity. AMD released mitigations for this vulnerability.
CVE Details
| CVE | CVE Description | CVSS Score |
| CVE-2025-29934 | A bug within some AMD CPUs could allow a local admin-privileged attacker to run a SEV-SNP guest using stale TLB entries, potentially resulting in loss of data integrity. | 5.3(Medium) CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N 6.8 (Medium) CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N |
Affected Products and Mitigation
AMD released to the Original Equipment Manufacturers (OEM) the Platform Initialization (PI) firmware versions on the dates listed below. Please contact your OEM for the BIOS update specific to your product(s).
AMD EPYC™ Series Processors
Program |
Former Code Name |
Mitigation1 Option 1: µcode (Released as part of PI) |
Mitigation1 Option 2: AGESA |
SEV Mitigation Vector Bit2 |
AMD EPYC™ 4004 Series Processors |
"Raphael" |
Not Affected | ||
AMD EPYC™ 7001 Series Processors |
"Naples" |
|||
AMD EPYC™ 7002 Series Processors |
"Rome" |
|||
AMD EPYC™ 4004 Series Processors |
"Raphael" |
|||
AMD EPYC™ 7003 Series Processors |
“Milan” |
0x0A0011DB3 |
MilanPI_1.0.0.F (2024-12-13) |
N/A |
AMD EPYC™ 7003 Series Processors |
"Milan-X" |
0x0A0012443 |
||
AMD EPYC™ 8004 Series Processors |
"Siena" |
0x0AA002194 |
GenoaPI_1.0.0.G (2025-06-26) |
|
AMD EPYC™ 9004 Series Processors |
"Genoa"/ |
0x0A1011544 |
||
"Genoa-X" |
0x0A10124F4 |
|||
"Bergamo" |
0x0AA002194 |
|||
AMD EPYC™ 9005 Series Processors |
"Turin Classic" |
0x0B00211E |
TurinPI_1.0.0.3 (2024-12-13) |
|
“Turin Dense” |
0x0B101028 |
|||
AMD EPYC™ 9V64H Processor |
“MI300C” |
Not Affected |
||
- µcodes, SEV FW and AGESA PI will be available under NDA on https://docs.amd.com
- For more information please reference the SEV Secure Nested Paging Firmware ABI Specification revision 1.58 or later (document 56860) available on https://docs.amd.com
- Ucode 0x0A0011DB and later require minimum 0x0A0011D9; 0x0A001244 and later require minimum 0x0A001242 for hot-loading to avoid #GP fault
- Ucode 0x0A101154 and later require minimum 0x0A101153 for hot-loading; ucode 0x0A10124F and later requires minimum ucode 0x0A10124E for hot loading; 0x0AA00219 and later require minimum 0x0AA00218 for hot-loading to avoid #GP fault
AMD EPYC™ Embedded Series Processors
Product |
Mitigation |
Release Date |
AMD EPYC™ Embedded 7003 Series Processors |
EmbMilan PI-SP3 v9 1.0.0.B |
2025-04-30 |
AMD EPYC™ Embedded 9004 Series Processors |
EmbGenoa PI-SP5 1.0.0.A |
2025-04-30 |
AMD EPYC™ Embedded 8004 Series Processors |
EmbGenoa PI-SP5 1.0.0.A |
2025-04-30 |
AMD EPYC™ Embedded 9005 Series Processors |
Version TBD |
Target release November 2025 |
Acknowledgement
Internally Reported
Revisions
| Revision Date | Description |
| 2025-11-11 | Initial publication |
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