CVE-2021-26336

Insufficient bounds checking in System Management Unit (SMU) may cause invalid memory accesses...

5.5 Medium

Insufficient bounds checking in System Management Unit (SMU) may cause invalid memory accesses/updates that could result in SMU hang and subsequent failure to service any further requests from other components.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.22%Down 0.2 points since Nov 17, 2021

What each source reports

NVD Score used 5.5

Record: CVE-2021-26336
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 4.9 MediumAV:L/AC:L/Au:N/C:N/I:N/A:C
Weakness: CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-26336
Updated: 2026-11-02

EUVDEUVD-2021-13142 No score

Record: EUVD-2021-13142
Updated: 2026-11-03

GitHub AdvisoriesGHSA-g84m-4q6r-8c89 5.5

Insufficient bounds checking in System Management Unit (SMU) may cause invalid memory accesses...

Record: GHSA-g84m-4q6r-8c89
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-119
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

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

In short

CVE-2021-26336 is a medium vulnerability (CVSS 5.5) in Amd Athlon™ Series, published November 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 12th percentile. No source names a fixed version.