CVE-2024-21953

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU...

5.9 MediumFix available

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU registers resulting in loss of guest data integrity.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: None

Exploit likelihood

0.19%Up 0.2 points since Feb 11, 2026

What each source reports

CVE List Score used 5.9

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU registers resulting in loss of guest data integrity.

Record: CVE-2024-21953
CVSS 4.0: 5.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
Weakness: CWE-1284
Updated: 2026-11-02

EUVDEUVD-2024-19559 5.9

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU registers resulting in loss of guest data integrity.

Record: EUVD-2024-19559
CVSS 4.0: 5.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-846p-qcjx-5365 5.9

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU...

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU registers resulting in loss of guest data integrity.

Record: GHSA-846p-qcjx-5365
CVSS 4.0: 5.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/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 5.9

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU registers resulting in loss of guest data integrity.

Record: CVE-2024-21953
CVSS 4.0: 5.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/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-2024-21953 5.9

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU registers resulting in loss of guest data integrity.

Record: DEBIAN-CVE-2024-21953
CVSS 4.0: 5.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/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-2024-21953 5.9

Improper input validation in IOMMU could allow a malicious hypervisor to reconfigure IOMMU registers resulting in loss of guest data integrity.

Record: UBUNTU-CVE-2024-21953
CVSS 4.0: 5.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
Updated: 2026-11-02

Affected products

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:24.04:LTS	All versions, plus listed versions 3.20230808.1.1ubuntu13.20231019.1ubuntu13.20231019.1ubuntu23.20231019.1ubuntu2.13.20250311.1ubuntu0.24.04.13.20251202.1ubuntu0.24.04.1	None known
`amd64-microcode` Ubuntu:25.10	All versions, plus listed versions 3.20240820.1ubuntu13.20250311.1ubuntu13.20250708.1ubuntu13.20251202.1ubuntu0.25.10.1	None known
`amd64-microcode` Ubuntu:26.10	All versions, plus listed versions 3.20251202.1ubuntu2	None known
`amd64-microcode` Ubuntu:26.04:LTS	All versions, plus listed versions 3.20250708.1ubuntu13.20250708.1ubuntu23.20251202.1ubuntu13.20251202.1ubuntu2	None known

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-2024-21953 is a medium vulnerability (CVSS 5.9) in Amd Epyc™ 8004 Series Processors, published February 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 8th 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.