How severe is CVE-2021-26391?

CVE-2021-26391 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-26391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26391?

CVE-2021-26391 primarily affects Amd Enterprise Driver. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26391 published?

CVE-2021-26391 was published on 2022-11-09 and last updated on 2026-06-17.

CVE-2021-26391

CVE-2021-26391 is a high-severity vulnerability in Amd Enterprise Driver with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Amd Enterprise Driver
Published: 2022-11-09
Last modified: 2026-06-17

Description

Insufficient verification of multiple header signatures while loading a Trusted Application (TA) may allow an attacker with privileges to gain code execution in that TA or the OS/kernel.

Frequently asked questions

What is CVE-2021-26391?: Insufficient verification of multiple header signatures while loading a Trusted Application (TA) may allow an attacker with privileges to gain code execution in that TA or the OS/kernel.
How severe is CVE-2021-26391?: CVE-2021-26391 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-26391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26391?: CVE-2021-26391 primarily affects Amd Enterprise Driver. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26391 published?: CVE-2021-26391 was published on 2022-11-09 and last updated on 2026-06-17.

References

https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1029

Affected products (26)

cpe:2.3:a:amd:enterprise_driver:*:*:*:*:*:*:*:*
cpe:2.3:a:amd:radeon_pro_software:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:amd:radeon_software:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:radeon_rx_vega_56_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:radeon_rx_vega_64_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5300ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5300g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5700ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5700g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5300u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5500u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5700u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5400u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5560u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600hs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5800u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5800h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5800hs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_9_5900hs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_9_5900hx_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_9_5980hs_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_9_5980hx_firmware:-:*:*:*:*:*:*:*

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