MediumCVE-2021-26367

    AMD: security vulnerability (CVE-2021-26367)

    Published Sources: CVE.org

    What is affected, what to do

    A malicious attacker in x86 can misconfigure the Trusted Memory Regions (TMRs), which may allow the attacker to set an arbitrary address range for the TMR, potentially leading to a loss of integrity and availability.

    Update AMD Radeon Software to version 23.12.1, AMD Ryzen 9 5980hx Firmware to version cezannepi-fp6_1.0.0.6, AMD Ryzen 3 3300u Firmware to version picassopi-fp5_1.0.0.e.

    Affected
    • AMD Radeon Software lt *..23.12.1
    • AMD Radeon Software lte *..23.q4
    • AMD Ryzen 9 5980hx Firmware lt *..cezannepi-fp6_1.0.0.6
    • AMD Ryzen 3 3300u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 3 3350u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3450u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3500u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3500c Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3550h Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3580u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 7 3700u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 7 3700c Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 7 3750h Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Ryzen 7 3780u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Athlon Gold 3150c Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Athlon Gold 3150u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Athlon Pro 3145b Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Athlon Silver 3050c Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Athlon Silver 3050u Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Athlon Pro 3045b Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Athlon Silver 3050e Firmware lt *..picassopi-fp5_1.0.0.e
    • AMD Athlon Gold Pro 3150g Firmware lt *..comboam4pi_1.0.0.9
    • AMD Athlon Gold 3150g Firmware lt *..comboam4pi_1.0.0.9
    • AMD Athlon Gold Pro 3150ge Firmware lt *..comboam4pi_1.0.0.9
    • AMD Athlon Pro 300ge Firmware lt *..comboam4pi_1.0.0.9
    • AMD Ryzen 3 4300ge Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 5 4600ge Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 7 4700ge Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 3 4300g Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 5 4600g Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 7 4700g Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 3 5300ge Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 3 5300g Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 5 5600ge Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 5 5600g Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 7 5700ge Firmware lt *..comboam4v2_pi_1.2.0.5
    • AMD Ryzen 7 5700g Firmware lt *..comboam4v2_pi_1.2.0.5
    Fixed in
    • AMD Radeon Software 23.12.1
    • AMD Ryzen 9 5980hx Firmware cezannepi-fp6_1.0.0.6
    • AMD Ryzen 3 3300u Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 3 3350u Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3450u Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3500u Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3500c Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3550h Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 5 3580u Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 7 3700u Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 7 3700c Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 7 3750h Firmware picassopi-fp5_1.0.0.e
    • AMD Ryzen 7 3780u Firmware picassopi-fp5_1.0.0.e
    • AMD Athlon Gold 3150c Firmware picassopi-fp5_1.0.0.e
    • AMD Athlon Gold 3150u Firmware picassopi-fp5_1.0.0.e
    • AMD Athlon Pro 3145b Firmware picassopi-fp5_1.0.0.e
    • AMD Athlon Silver 3050c Firmware picassopi-fp5_1.0.0.e
    • AMD Athlon Silver 3050u Firmware picassopi-fp5_1.0.0.e
    • AMD Athlon Pro 3045b Firmware picassopi-fp5_1.0.0.e
    • AMD Athlon Silver 3050e Firmware picassopi-fp5_1.0.0.e
    • AMD Athlon Gold Pro 3150g Firmware comboam4pi_1.0.0.9
    • AMD Athlon Gold 3150g Firmware comboam4pi_1.0.0.9
    • AMD Athlon Gold Pro 3150ge Firmware comboam4pi_1.0.0.9
    • AMD Athlon Pro 300ge Firmware comboam4pi_1.0.0.9
    • AMD Ryzen 3 4300ge Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 5 4600ge Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 7 4700ge Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 3 4300g Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 5 4600g Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 7 4700g Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 3 5300ge Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 3 5300g Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 5 5600ge Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 5 5600g Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 7 5700ge Firmware comboam4v2_pi_1.2.0.5
    • AMD Ryzen 7 5700g Firmware comboam4v2_pi_1.2.0.5

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    6.0

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    5.7

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: CVE.org

    0.2 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 4.9

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    34.65 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    6.0 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    5.7
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.2 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    4.9
    Low — this CVE sits in the lower 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 13 August 2024

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A malicious attacker in x86 can misconfigure the Trusted Memory Regions (TMRs), which may allow the attacker to set an arbitrary address range for the TMR, potentially leading to a loss of integrity and availability.

    Source: cvelistv5, NVD (NIST)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    AMDAMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics
    • —
    • —
    AMDAMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics
    • —
    • —
    AMDAMD Radeon™ PRO W6000 Series Graphics Cards
    • —
    • —
    AMDAMD Radeon™ RX 6000 Series Graphics Cards
    • —
    • —
    AMDAMD Ryzen™ 3000 Series Processors with Radeon™ Graphics
    • —
    • —
    AMDAMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics
    • —
    • —
    AMDAMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics
    • —
    • —
    AMDAMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics
    • —
    • —
    AMDAMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics
    • —
    • —
    AMDAMD Ryzen™ 5000 Series Processors with Radeon™ Graphics
    • —
    • —
    AMDAMD Ryzen™ Embedded R1000 Series Processors
    • —
    • —
    AMDAMD Ryzen™ Embedded R2000 Series Processors
    • —
    • —
    AMDAMD Ryzen™ Embedded V1000 Series Processors
    • —
    • —
    AMDAMD Ryzen™ Embedded V2000 Series Processors
    • —
    • —
    amdradeon_software
    • < 23.12.1
    • ≤ 23.q4
    • 23.12.1
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Otheramdathlon_gold_3150c_firmware—
    Otheramdathlon_gold_3150g_firmware—
    Otheramdathlon_gold_3150u_firmware—
    Otheramdathlon_gold_pro_3150g_firmware—
    Otheramdathlon_gold_pro_3150ge_firmware—
    Otheramdathlon_pro_300ge_firmware—
    Otheramdathlon_pro_3045b_firmware—
    Otheramdathlon_pro_3145b_firmware—
    Otheramdathlon_silver_3050c_firmware—
    Otheramdathlon_silver_3050e_firmware—
    Otheramdathlon_silver_3050u_firmware—
    Otheramdryzen_3_3300u_firmware—
    Otheramdryzen_3_3350u_firmware—
    Otheramdryzen_3_4300g_firmware—
    Otheramdryzen_3_4300ge_firmware—
    Otheramdryzen_3_5300g_firmware—
    Otheramdryzen_3_5300ge_firmware—
    Otheramdryzen_5_3450u_firmware—
    Otheramdryzen_5_3500c_firmware—
    Otheramdryzen_5_3500u_firmware—
    Otheramdryzen_5_3550h_firmware—
    Otheramdryzen_5_3580u_firmware—
    Otheramdryzen_5_4600g_firmware—
    Otheramdryzen_5_4600ge_firmware—

    References & sources

    • amd.comen/resources/product-security/bulletin/amd-sb-4004.htmlVendor advisory
    • amd.comen/resources/product-security/bulletin/amd-sb-6005.htmlVendor advisory
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    Badge preview for CVE-2021-26367
    <a href="https://intel.neosec.eu/en/cve/CVE-2021-26367"><img src="https://intel.neosec.eu/badge/cve/CVE-2021-26367.svg?lang=en" alt="CVE-2021-26367 – NEOSEC Intel" height="20"></a>