CVE-2025-52534

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory...

5.3 MediumFix available

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory, potentially resulting in loss of integrity.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

0.35%Up 0.3 points since Feb 11, 2026

What each source reports

CVE List Score used 5.3

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory, potentially resulting in loss of integrity.

Record: CVE-2025-52534
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Weakness: CWE-1284
Updated: 2026-11-02

EUVDEUVD-2025-207435 5.3

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory, potentially resulting in loss of integrity.

Record: EUVD-2025-207435
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-633w-44jw-wrp4 5.3

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory...

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory, potentially resulting in loss of integrity.

Record: GHSA-633w-44jw-wrp4
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-1284
Updated: 2026-11-02

NVD 5.3

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory, potentially resulting in loss of integrity.

Record: CVE-2025-52534
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-1284
Updated: 2026-11-02

OSVDEBIAN-CVE-2025-52534 5.3

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory, potentially resulting in loss of integrity.

Record: DEBIAN-CVE-2025-52534
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-07

OSVUBUNTU-CVE-2025-52534 5.3

Improper bound check within AMD CPU microcode can allow a malicious guest to write to host memory, potentially resulting in loss of integrity.

Record: UBUNTU-CVE-2025-52534
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Updated: 2026-11-02

Affected products

amd epyc™ 9005 series processors

Affected packages

Affected packages
Package	Affected	Fixed
`amd64-microcode` Debian:12	All versions, plus listed versions 0.20120117-11.20120117-11.20120117-21.20120117-2~bpo60+11.20120910-1 Show 45 moreShow less 1.20120910-1~bpo60+11.20120910-21.20120910-2~bpo60+11.20120910-31.20141028.11.20160316.12.20120910-12.20120910-1~bpo70+12.20131007.12.20131007.1+really20130710.12.20141028.12.20141028.1~bpo70+12.20160316.12.20160316.1~bpo70+12.20160316.1~deb8u13.20160316.13.20160316.23.20160316.33.20171205.13.20171205.23.20180515.13.20180524.13.20180524.1~bpo9+13.20181128.13.20181128.1~bpo9+13.20181128.1~deb8u13.20181128.1~deb9u13.20181128.1~deb9u23.20191021.13.20191218.13.20220411.13.20220411.23.20230414.13.20230719.13.20230719.1~deb10u13.20230719.1~deb11u13.20230719.1~deb12u13.20230808.13.20230808.1.13.20230808.1.1~deb11u13.20230808.1.1~deb12u13.20230823.13.20231019.13.20240116.23.20240116.2+nmu1	None known
`amd64-microcode` Debian:13	All versions, plus listed versions 0.20120117-11.20120117-11.20120117-21.20120117-2~bpo60+11.20120910-1 Show 45 moreShow less 1.20120910-1~bpo60+11.20120910-21.20120910-2~bpo60+11.20120910-31.20141028.11.20160316.12.20120910-12.20120910-1~bpo70+12.20131007.12.20131007.1+really20130710.12.20141028.12.20141028.1~bpo70+12.20160316.12.20160316.1~bpo70+12.20160316.1~deb8u13.20160316.13.20160316.23.20160316.33.20171205.13.20171205.23.20180515.13.20180524.13.20180524.1~bpo9+13.20181128.13.20181128.1~bpo9+13.20181128.1~deb8u13.20181128.1~deb9u13.20181128.1~deb9u23.20191021.13.20191218.13.20220411.13.20220411.23.20230414.13.20230719.13.20230719.1~deb10u13.20230719.1~deb11u13.20230719.1~deb12u13.20230808.13.20230808.1.13.20230808.1.1~deb11u13.20230808.1.1~deb12u13.20230823.13.20231019.13.20240116.23.20240116.2+nmu1	None known
`amd64-microcode` Debian:14	before 3.20260923.1, plus listed versions 0.20120117-11.20120117-11.20120117-21.20120117-2~bpo60+11.20120910-1 Show 45 moreShow less 1.20120910-1~bpo60+11.20120910-21.20120910-2~bpo60+11.20120910-31.20141028.11.20160316.12.20120910-12.20120910-1~bpo70+12.20131007.12.20131007.1+really20130710.12.20141028.12.20141028.1~bpo70+12.20160316.12.20160316.1~bpo70+12.20160316.1~deb8u13.20160316.13.20160316.23.20160316.33.20171205.13.20171205.23.20180515.13.20180524.13.20180524.1~bpo9+13.20181128.13.20181128.1~bpo9+13.20181128.1~deb8u13.20181128.1~deb9u13.20181128.1~deb9u23.20191021.13.20191218.13.20220411.13.20220411.23.20230414.13.20230719.13.20230719.1~deb10u13.20230719.1~deb11u13.20230719.1~deb12u13.20230808.13.20230808.1.13.20230808.1.1~deb11u13.20230808.1.1~deb12u13.20230823.13.20231019.13.20240116.23.20240116.2+nmu1	3.20260923.1
`amd64-microcode` Ubuntu:14.04:LTS	All versions, plus listed versions 1.20120910-32.20131007.1+really20130710.13.20180524.1~ubuntu0.14.04.13.20180524.1~ubuntu0.14.04.2+really20130710.13.20180524.1~ubuntu0.14.04.2+really20130710.1ubuntu1	None known
`amd64-microcode` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 2.20141028.12.20160316.13.20180524.1~ubuntu0.16.04.13.20180524.1~ubuntu0.16.04.23.20191021.1ubuntu0.16.04.1 Show 4 moreShow less 3.20191021.1+really3.20180524.1~ubuntu0.16.04.23.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm13.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm23.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm3	None known
`amd64-microcode` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 3.20160316.33.20171205.13.20180524.1~ubuntu0.18.04.13.20180524.1~ubuntu0.18.04.23.20191021.1ubuntu0.18.04.2 Show 4 moreShow less 3.20191021.1+really3.20181128.1~ubuntu0.18.04.13.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm13.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm23.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm3	None known
`amd64-microcode` Ubuntu:20.04:LTS	All versions, plus listed versions 3.20181128.1ubuntu23.20191021.1ubuntu13.20191218.1ubuntu13.20191218.1ubuntu1.13.20191218.1ubuntu1.23.20191218.1ubuntu1.3	None known
`amd64-microcode` Ubuntu:22.04:LTS	All versions, plus listed versions 3.20191218.1ubuntu23.20191218.1ubuntu2.13.20191218.1ubuntu2.23.20191218.1ubuntu2.3	None known
`amd64-microcode` Ubuntu:24.04:LTS	before 3.20251202.1ubuntu0.24.04.1, plus listed versions 3.20230808.1.1ubuntu13.20231019.1ubuntu13.20231019.1ubuntu23.20231019.1ubuntu2.13.20250311.1ubuntu0.24.04.1	3.20251202.1ubuntu0.24.04.1
`amd64-microcode` Ubuntu:25.10	before 3.20251202.1ubuntu0.25.10.1, plus listed versions 3.20240820.1ubuntu13.20250311.1ubuntu13.20250708.1ubuntu1	3.20251202.1ubuntu0.25.10.1
`amd64-microcode` Ubuntu:26.04:LTS	before 3.20251202.1ubuntu1, plus listed versions 3.20250708.1ubuntu13.20250708.1ubuntu2	3.20251202.1ubuntu1

History

History
Recorded	Changed	Sources
Nov 7, 2026	affected, facts	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-52534 is a medium vulnerability (CVSS 5.3) in Amd Epyc™ 9005 Series Processors, published February 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.35%, the 29th percentile. Fixed in amd64-microcode 3.20260923.1.

References

This page doesn't list everything

Left out here: 35 versions. The JSON record has them.