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CVE Record

CVE-2019-19807: In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after-free caused by erroneous code refacto...

In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after-free caused by erroneous code refactoring, aka CID-e7af6307a8a5. This is related to snd_timer_open and snd_timer_close_locked. The timeri variable was originally intended to be for a newly created timer instance, but was used for a different purpose after refactoring.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2019-19807 is a Linux kernel use-after-free bug in the sound timer subsystem. The provided record says Linux kernels before 5.3.11 are affected and identifies the upstream fixing commit. Business urgency depends on where older kernels remain deployed and whether vendor-supported kernels include the backported fix.

Executive priority

Treat this as a kernel hygiene and legacy exposure item rather than a confirmed emergency. Prioritize remediation where older kernels remain on internet-facing, shared, or high-value systems, but avoid claiming active exploitation from the provided evidence.

Technical view

The issue is in sound/core/timer.c around snd_timer_open and snd_timer_close_locked. A refactoring reused timeri for the wrong purpose, creating a use-after-free. The upstream identifier is commit e7af6307a8a54f0b873960b32b6a644f2d0fbd97, included in the Linux 5.3.11 changelog.

Likely exposure

Exposure is most likely on Linux systems running kernels before 5.3.11 or vendor kernels missing the backport. The bundle does not provide affected distro package versions, CPEs, or hardware scope, so exposure must be validated against each vendor kernel advisory.

Exploitation context

CISA KEV status is false in the bundle, and no provided source states active exploitation. The record does not provide CVSS, public exploit status, or impact detail beyond use-after-free, so exploitation likelihood and practical impact remain unclear from the supplied evidence.

Researcher notes

The strongest evidence is the upstream commit and Linux 5.3.11 changelog. The supplied CVE metadata lacks CVSS, CWE, precise affected CPEs, and exploit status. Vendor advisories should be used to map real package exposure and fixed builds.

Mitigation direction

  • Apply vendor kernel updates that include the upstream fix or an equivalent backport.
  • For mainline kernels, move to Linux 5.3.11 or later where applicable.
  • Check Ubuntu USN-4225-1, USN-4227-1, and USN-4227-2 for distro-specific packages.
  • Check NetApp advisory NTAP-20200103-0001 for affected NetApp product guidance.
  • Prioritize systems with outdated kernels and exposed multi-user workloads.

Validation and detection

  • Inventory deployed Linux kernel versions and vendor package release levels.
  • Confirm whether each vendor kernel includes commit e7af6307a8a54f0b873960b32b6a644f2d0fbd97 or equivalent backport.
  • Review distro advisories for exact fixed package versions before closing tickets.
  • Verify reboot or live-patch completion after kernel updates.
  • Document exceptions where appliances rely on vendor-maintained kernels.
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

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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
8Source 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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