CVE & CISA-KEV Catalog

CVE-2021-38578

HIGH
7.4
CVSS v3
NVD

Description

Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.

CWE-124CWE-787Out-of-bounds Write

How to fix

Remediation Available
edk2Debian
Fixed in:2020.11-2+deb11u3CVE-2021-38578
Fixed in:2022.11-1CVE-2021-38578
Fixed in:2022.11-1CVE-2021-38578
Fixed in:2022.11-1CVE-2021-38578
edk2Rocky
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2Red Hat / RHEL
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-aarch64Red Hat / RHEL
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-aarch64Rocky
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-debugsourceRed Hat / RHEL
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-debugsourceRocky
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-ovmfRocky
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-ovmfRed Hat / RHEL
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-toolsRed Hat / RHEL
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-toolsRocky
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-tools-debuginfoRocky
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-tools-debuginfoRed Hat / RHEL
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-tools-docRocky
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2-tools-docRed Hat / RHEL
Fixed in:0:20221207gitfff6d81270b5-9.el9_2RHSA-2023:2165
edk2Ubuntu
Fixed in:0~20160408.ffea0a2c-2ubuntu0.2+esm3USN-7060-1
Fixed in:0~20180205.c0d9813c-2ubuntu0.3+esm2USN-7060-1
Fixed in:0~20191122.bd85bf54-2ubuntu3.6USN-7060-1
Fixed in:2022.02-3ubuntu0.22.04.3USN-7060-1
ovmfUbuntu
Fixed in:0~20160408.ffea0a2c-2ubuntu0.2+esm3USN-7060-1
Fixed in:0~20180205.c0d9813c-2ubuntu0.3+esm2USN-7060-1
Fixed in:0~20191122.bd85bf54-2ubuntu3.6USN-7060-1
Fixed in:2022.02-3ubuntu0.22.04.3USN-7060-1
ovmf-ia32Ubuntu
Fixed in:2022.02-3ubuntu0.22.04.3USN-7060-1
qemu-efiUbuntu
Fixed in:0~20160408.ffea0a2c-2ubuntu0.2+esm3USN-7060-1
qemu-efi-aarch64Ubuntu
Fixed in:0~20180205.c0d9813c-2ubuntu0.3+esm2USN-7060-1
Fixed in:0~20191122.bd85bf54-2ubuntu3.6USN-7060-1
Fixed in:2022.02-3ubuntu0.22.04.3USN-7060-1
qemu-efi-armUbuntu
Fixed in:0~20180205.c0d9813c-2ubuntu0.3+esm2USN-7060-1
Fixed in:0~20191122.bd85bf54-2ubuntu3.6USN-7060-1
Fixed in:2022.02-3ubuntu0.22.04.3USN-7060-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeChanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityLow

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L

Exploit Intelligence

0.97%probability of exploitation in 30 days
57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Vendor Advisory1
Third-Party Advisory1
Other references1
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.