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CVE Record

CVE-2019-20934: An issue was discovered in the Linux kernel before 5.2.6.

An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2019-20934 is a Linux kernel memory-safety flaw in NUMA scheduler statistics handling. The public record says kernels before 5.2.6 are affected on NUMA systems. Business urgency depends on whether your fleet runs those kernels or vendor backports without the fix.

Executive priority

Treat this as an inventory and patch hygiene item unless affected legacy NUMA servers are confirmed. There is no source-backed active exploitation signal, but kernel memory-safety issues deserve timely remediation where exposure exists.

Technical view

The issue is a use-after-free in the Linux fair scheduler function show_numa_stats(). The CVE states NUMA fault statistics are freed inappropriately, associated with kernel commit 16d51a590a8c and fixed before Linux 5.2.6. No CVSS, CWE, or product-specific distribution matrix is provided.

Likely exposure

Exposure is most likely on Linux systems running kernel versions before 5.2.6 with NUMA enabled or NUMA-capable hardware. Many enterprise distributions may use backported fixes, so kernel package provenance matters more than the upstream version string alone.

Exploitation context

The provided sources do not show KEV listing or confirmed active exploitation. The Project Zero reference indicates security research visibility, but the bundle does not establish exploit availability, practical impact, or required privileges.

Researcher notes

Evidence is limited to the CVE description, upstream changelog, upstream commit reference, and Project Zero issue. Validate backports carefully; the supplied affected-product metadata is not granular enough for distribution-specific determinations.

Mitigation direction

  • Inventory Linux kernel versions across server and cloud workloads.
  • Identify NUMA-capable systems or workloads with NUMA enabled.
  • Apply vendor kernel updates containing the upstream fix or equivalent backport.
  • If self-building kernels, use Linux 5.2.6 or later with the referenced fix.
  • Check distribution advisories before assuming an older version string is vulnerable.

Validation and detection

  • Confirm each host's kernel package build and vendor patch level.
  • Map kernel packages to vendor advisories or the referenced upstream commit.
  • Prioritize validation on NUMA servers and high-value infrastructure.
  • Record systems that remain below fixed vendor levels for exception tracking.
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

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CVE-2019-20934 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
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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