Insufficient bounds checking in an SMU mailbox register could allow an attacker to potentially read outside of the SRAM address range which…

published 2022-05-11 4y ago modified 2026-06-17 4mo ago also EUVD-2021-13170

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits: 0; none known

Insufficient bounds checking in an SMU mailbox register could allow an attacker to potentially read outside of the SRAM address range which could result in an exception handling leading to a potential denial of service.

Patch / fix

fixed in 20 distros 2

amd epyc_7232p_firmware romepi-sp3_1.0.0.d
amd epyc_7302p_firmware romepi-sp3_1.0.0.d
amd epyc_7402p_firmware romepi-sp3_1.0.0.d
amd epyc_7502p_firmware romepi-sp3_1.0.0.d
amd epyc_7702p_firmware romepi-sp3_1.0.0.d
amd epyc_7252_firmware romepi-sp3_1.0.0.d
amd epyc_7262_firmware romepi-sp3_1.0.0.d
amd epyc_7272_firmware romepi-sp3_1.0.0.d
amd epyc_7282_firmware romepi-sp3_1.0.0.d
amd epyc_7302_firmware romepi-sp3_1.0.0.d
amd epyc_7352_firmware romepi-sp3_1.0.0.d
amd epyc_7402_firmware romepi-sp3_1.0.0.d
amd epyc_7452_firmware romepi-sp3_1.0.0.d
amd epyc_7502_firmware romepi-sp3_1.0.0.d
amd epyc_7532_firmware romepi-sp3_1.0.0.d
amd epyc_7542_firmware romepi-sp3_1.0.0.d
amd epyc_7552_firmware romepi-sp3_1.0.0.d
amd epyc_7642_firmware romepi-sp3_1.0.0.d
amd epyc_7662_firmware romepi-sp3_1.0.0.d
amd epyc_7702_firmware romepi-sp3_1.0.0.d

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

Is CVE-2021-26364 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	4.9	AV:L/AC:L/Au:N/C:N/I:N/A:C

Affected products

AMD EPYC™ Processors

Classification

Weakness

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

amd.com /en/corporate/product-security/bulletin/amd-sb-1028
vendor-advisory

Sources

CVE List CVE-2021-26364
NVD CVE-2021-26364

Fencer Intel 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.