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CVE Record

CVE-2021-47362: drm/amd/pm: Update intermediate power state for SI

In the Linux kernel, the following vulnerability has been resolved: drm/amd/pm: Update intermediate power state for SI Update the current state as boot state during dpm initialization. During the subsequent initialization, set_power_state gets called to transition to the final power state. set_power_state refers to values from the current state and without current state populated, it could result in NULL pointer dereference. For ex: on platforms where PCI speed change is supported through ACPI ATCS method, the link speed of current state needs to be queried before deciding on changing to final power state's link speed. The logic to query ATCS-support was broken on certain platforms. The issue became visible when broken ATCS-support logic got fixed with commit f9b7f3703ff9 ("drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)"). Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1698

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel stability vulnerability in AMDGPU power management. On affected systems, initialization can hit a NULL pointer dereference while moving from boot power state to final power state, potentially crashing the system. Public sources do not provide CVSS, CWE, or active exploitation evidence.

Executive priority

Treat this as a targeted Linux kernel maintenance issue, not an emergency based on current evidence. Prioritize patching where affected AMD graphics hardware and stability requirements overlap.

Technical view

The flaw is in drm/amd/pm SI dynamic power management. During DPM initialization, the current state was not populated before set_power_state used it, including ACPI ATCS link-speed decision paths. The upstream fix updates the current state to the boot state during initialization.

Likely exposure

Exposure appears limited to affected Linux kernel builds using AMDGPU power management for SI-era AMD graphics hardware, especially platforms involving ACPI ATCS PCIe link-speed handling. Exact distribution package ranges are not provided in the bundle.

Exploitation context

The sources describe a NULL pointer dereference during initialization, not a remote attack path. CISA KEV status is false, and the provided bundle cites no public exploitation or weaponized exploit details.

Researcher notes

The public record lacks CVSS, CWE, detailed affected package ranges, and exploitability analysis. The best-supported assessment is a kernel NULL pointer dereference in AMDGPU SI power-state initialization fixed by upstream stable commits.

Mitigation direction

  • Check Linux distribution advisories for CVE-2021-47362 fixed kernel packages.
  • Upgrade to a vendor-supported kernel containing the referenced upstream stable fixes.
  • Prioritize systems with AMDGPU SI hardware or related boot-time stability incidents.
  • Avoid direct deploy assumptions; follow normal kernel change-control and reboot planning.

Validation and detection

  • Inventory Linux kernel versions and affected AMDGPU hardware across managed assets.
  • Confirm whether the running kernel includes the referenced stable commits.
  • Review boot and crash logs for AMDGPU DPM initialization failures.
  • Track vendor advisory status if distribution package mapping is unclear.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-47362 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux2ab4d0e74256fc49b7b270f63c1d1e47c2455abc, 2ab4d0e74256fc49b7b270f63c1d1e47c2455abc, 2ab4d0e74256fc49b7b270f63c1d1e47c2455abc, 2c83e77a3e35dc91350cea077d1aaefdc0a61297, 46cb720a8a3ece894eff4e1b85b3925efb71afd2, 65c96da9c684946d0874bf911fdb50a3b497cb30unaffected
LinuxLinux4.19, 0, 5.10.70, 5.14.9, 5.15affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.