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CVE Record

CVE-2019-19602: fpregs_state_valid in arch/x86/include/asm/fpu/internal.h in the Linux kernel before 5.4.2, when GCC 9 is u...

fpregs_state_valid in arch/x86/include/asm/fpu/internal.h in the Linux kernel before 5.4.2, when GCC 9 is used, allows context-dependent attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact because of incorrect fpu_fpregs_owner_ctx caching, as demonstrated by mishandling of signal-based non-cooperative preemption in Go 1.14 prereleases on amd64, aka CID-59c4bd853abc.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel flaw can corrupt memory or crash affected systems in specific x86/amd64 conditions. The sources tie it to kernels before 5.4.2 built with GCC 9 and a Go 1.14 prerelease behavior. No provided source shows active exploitation.

Executive priority

Treat this as a patch-management priority for affected Linux fleets, especially shared compute or systems running untrusted code. It is not supported as an active-exploitation emergency by the provided sources.

Technical view

The issue is in fpregs_state_valid in Linux x86 FPU handling. Incorrect fpu_fpregs_owner_ctx caching can mishandle signal-based non-cooperative preemption, causing denial of service or unspecified impact. The upstream fix is commit 59c4bd853abc, included in Linux 5.4.2.

Likely exposure

Exposure is most likely on x86/amd64 Linux systems running kernels before 5.4.2 built with GCC 9, or downstream vendor kernels carrying the vulnerable code. The provided affected product metadata is incomplete.

Exploitation context

CISA KEV status is false, and the supplied sources do not claim active exploitation. Evidence describes a kernel correctness bug demonstrated through Go 1.14 prerelease behavior, not a public weaponized exploit.

Researcher notes

The CVE record lacks CVSS, CWE, and precise affected CPEs. Analysis should center on upstream commit 59c4bd853abc, Linux 5.4.2 changelog inclusion, distro/vendor backports, and the Go issue context.

Mitigation direction

  • Apply vendor kernel updates that include commit 59c4bd853abc or the Linux 5.4.2 fix.
  • Review Ubuntu USN-4284-1 for applicable Ubuntu kernel packages.
  • Review NetApp advisory NTAP-20200103-0001 for affected NetApp products.
  • Reboot systems after kernel updates to ensure the fixed kernel is running.
  • If vendor status is unclear, request guidance from the platform or distribution maintainer.

Validation and detection

  • Inventory Linux kernel versions on x86/amd64 systems.
  • Identify kernels built with GCC 9 where build metadata is available.
  • Confirm whether the running kernel includes commit 59c4bd853abc or equivalent vendor backport.
  • Check Ubuntu and NetApp advisories against deployed product versions.
  • Prioritize validation on systems running untrusted local workloads or Go prerelease workloads from that period.
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

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