An attacker with access to a malicious hypervisor may be able to infer data values used in a SEV guest on AMD CPUs by monitoring ciphertext…

published 2022-05-11 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33400

cvss: 6.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits: 0; none known

An attacker with access to a malicious hypervisor may be able to infer data values used in a SEV guest on AMD CPUs by monitoring ciphertext values over time.

Patch / fix

distros 2

suse opensuse

kernel-firmware SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 20220509-150400.4.5.1
kernel-firmware SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 20191118-150000.3.42.1
kernel-firmware SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +3 more 20190618-5.25.2
kernel-firmware SLE Module for Basesystem 15 SP3, SLE Micro 5.2, SLE Micro 5.1 +1 more 20210208-150300.4.10.1
kernel-firmware SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES 15 SP2-LTSS +12 more 20200107-150100.3.31.1

suse advisories SUSE-SU-2022:1923-1 SUSE-SU-2022:1847-1 SUSE-SU-2022:1846-1 SUSE-SU-2022:1840-1 SUSE-SU-2022:1751-1

kernel-firmware-all openSUSE Tumbleweed 20250206-1.1
kernel-firmware-amdgpu openSUSE Tumbleweed 20250206-1.1
kernel-firmware-ath10k openSUSE Tumbleweed 20250206-1.1
kernel-firmware-ath11k openSUSE Tumbleweed 20250206-1.1
kernel-firmware-ath12k openSUSE Tumbleweed 20250206-1.1
kernel-firmware-atheros openSUSE Tumbleweed 20250206-1.1
kernel-firmware-bluetooth openSUSE Tumbleweed 20250208-1.1
kernel-firmware-bnx2 openSUSE Tumbleweed 20250206-1.1

opensuse advisories openSUSE-SU-2025:14804-1 openSUSE-SU-2025:14769-1 openSUSE-SU-2025:14770-1 openSUSE-SU-2025:14771-1 openSUSE-SU-2025:14772-1 openSUSE-SU-2025:14773-1

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD	2.0	2.1	AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

AMD AMD Processors

Classification

Weakness

CWE-203 Observable Discrepancy

References

amd.com /en/corporate/product-security/bulletin/amd-sb-1033
vendor-advisory
openwall.com /lists/oss-security/2022/08/08/6
mailing-list, third-party-advisory

Sources

CVE List CVE-2021-46744
NVD CVE-2021-46744

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary