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CVE Record

CVE-2021-47490: drm/ttm: fix memleak in ttm_transfered_destroy

In the Linux kernel, the following vulnerability has been resolved: drm/ttm: fix memleak in ttm_transfered_destroy We need to cleanup the fences for ghost objects as well. Bug: https://bugzilla.kernel.org/show_bug.cgi?id=214029 Bug: https://bugzilla.kernel.org/show_bug.cgi?id=214447

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-47490 is a Linux kernel memory leak in the DRM TTM graphics memory manager. The source describes leaked fence cleanup for ghost objects. Business impact is unclear from public data, but kernel memory leaks can affect system stability when reachable.

Executive priority

Treat this as a routine kernel maintenance item unless vendor advisories rate your deployed kernels higher. The available evidence does not justify emergency response, but unpatched kernel defects should not remain indefinitely.

Technical view

The resolved kernel issue is in drm/ttm, specifically ttm_transfered_destroy. The fix cleans up fences for ghost objects. The CVE source lists Linux kernel version ranges and multiple stable commit references, but provides no CVSS, CWE, exploitability detail, or concrete attack prerequisites.

Likely exposure

Exposure is limited to Linux systems running affected kernel builds or builds containing the introduced code without the referenced stable fixes. Systems using DRM/TTM graphics memory paths are the most relevant candidates for review.

Exploitation context

The provided bundle does not support active exploitation. KEV is false, and the cited sources describe a resolved kernel memory leak rather than public exploitation, proof of concept, or weaponized activity.

Researcher notes

Evidence is sparse. The public record identifies a DRM TTM memory leak fix and references stable commits, but lacks CVSS, CWE, detailed impact, triggering conditions, and exploit evidence. Avoid broader claims without downstream vendor analysis.

Mitigation direction

  • Inventory Linux kernel versions and downstream vendor package versions.
  • Apply vendor kernel updates containing the referenced stable fixes.
  • Check Linux distribution advisories if version mapping is unclear.
  • Prioritize systems with active DRM/TTM graphics workloads.

Validation and detection

  • Compare running kernel builds against vendor advisories for CVE-2021-47490.
  • Confirm patched builds include one of the referenced stable commits or downstream backports.
  • Review fleet telemetry for kernel memory pressure on relevant graphics systems.
  • Track exceptions where kernel updates cannot be applied promptly.
Prepared
Confidence
medium
Sources
8

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-2021-47490 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
7Source 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

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxd02117f8efaa5fbc37437df1ae955a147a2a424a, d02117f8efaa5fbc37437df1ae955a147a2a424aunaffected
LinuxLinux5.14, 0, 5.14.16, 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.