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CVE-2019-19252: vcs_write in drivers/tty/vt/vc_screen.c in the Linux kernel through 5.3.13 does not prevent write access to...

vcs_write in drivers/tty/vt/vc_screen.c in the Linux kernel through 5.3.13 does not prevent write access to vcsu devices, aka CID-0c9acb1af77a.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

A Linux kernel virtual-console component allowed writes to a vcsu device that should not have been writable. This is a local system issue from the provided evidence, not a remote internet-facing flaw. Business risk depends on systems where untrusted local users or workloads can access these device nodes.

Executive priority

Treat this as a kernel maintenance and local-user risk item. It should not outrank remotely exploitable critical issues based on the supplied evidence, but it matters on shared Linux systems or appliances where local access by untrusted users is possible.

Technical view

The issue is in vcs_write in drivers/tty/vt/vc_screen.c through Linux kernel 5.3.13. The CVE links it to upstream commit 0c9acb1af77a, which blocks write access to vcsu devices. The bundle provides no CVSS, CWE, or detailed impact beyond improper write access to these virtual-console screen devices.

Likely exposure

Linux systems running kernels through 5.3.13 may be exposed if vcsu device nodes are present and accessible to local users or workloads. Exposure for Ubuntu and NetApp environments should be checked against their advisories. The provided bundle does not identify all affected distributions or configurations.

Exploitation context

No active exploitation is shown: KEV is false and the supplied sources do not report exploitation in the wild. The described condition appears to require local access to the relevant virtual-console device, so internet scanning alone is unlikely to validate exposure.

Researcher notes

The public bundle is sparse: it identifies the vulnerable kernel file, affected range through 5.3.13, and upstream corrective commit, but not CVSS, CWE, exploitability details, or complete vendor impact. Avoid assuming privilege escalation or denial of service without vendor-specific confirmation.

Mitigation direction

  • Apply vendor kernel updates that include upstream commit 0c9acb1af77a or distribution security fixes.
  • Review Ubuntu USN-4258-1 and USN-4284-1 for applicable package updates.
  • Review NetApp advisory NTAP-20200103-0001 if using NetApp-supported platforms.
  • Prioritize systems with untrusted shell users, shared hosting, or multi-tenant workloads.
  • Check vendor guidance before applying nonstandard device-permission workarounds.

Validation and detection

  • Inventory Linux kernel versions and identify systems at or below 5.3.13.
  • Confirm whether vendor security updates for CVE-2019-19252 are installed.
  • Check whether vcsu device nodes exist and are locally accessible.
  • Map exposed systems to Ubuntu, NetApp, or upstream kernel advisory coverage.
  • Document any unsupported kernels requiring upgrade or vendor confirmation.
Prepared
Confidence
medium
Sources
7

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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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
6Source 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

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