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CVE Record

CVE-2022-50448: mm/uffd: fix warning without PTE_MARKER_UFFD_WP compiled in

In the Linux kernel, the following vulnerability has been resolved: mm/uffd: fix warning without PTE_MARKER_UFFD_WP compiled in When PTE_MARKER_UFFD_WP not configured, it's still possible to reach pte marker code and trigger an warning. Add a few CONFIG_PTE_MARKER_UFFD_WP ifdefs to make sure the code won't be reached when not compiled in.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can trigger a kernel warning when specific userfaultfd write-protect marker code is reachable even though the related build option is not enabled. The public record does not describe data theft, privilege escalation, or remote compromise. Treat it as a kernel stability and hygiene issue until vendor advisories provide more impact detail.

Executive priority

Schedule remediation through normal kernel maintenance unless vendor guidance raises severity. There is no evidence of active exploitation in the provided sources, but kernel defects can affect reliability and may inherit operational risk on exposed or multi-tenant Linux hosts.

Technical view

The flaw is in Linux mm/uffd handling. When CONFIG_PTE_MARKER_UFFD_WP is absent, pte marker code could still be reached and trigger a warning. The fix adds CONFIG_PTE_MARKER_UFFD_WP guards so that code path is not entered when unsupported. CVSS, CWE, and detailed impact are not provided.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions or backports with the vulnerable mm/uffd code path and without PTE_MARKER_UFFD_WP compiled in. The source lists Linux 5.19, 5.19.17, 6.0.3, and 6.1, but distribution backport status must be verified.

Exploitation context

CISA KEV is false in the provided bundle, and no cited source reports active exploitation. The available description only supports a reachable kernel warning condition, not a confirmed exploit chain. Practical exploitability and security impact remain unclear from the supplied evidence.

Researcher notes

Public metadata is sparse: no CVSS, CWE, exploit status, or detailed affected configuration matrix is supplied. Analysis should focus on commit presence, kernel config, and distribution backport mapping rather than assuming all version strings are equally exposed.

Mitigation direction

  • Check Linux vendor or distribution advisories for CVE-2022-50448 coverage.
  • Update affected kernels to builds containing the referenced stable fixes.
  • Prioritize systems running listed 5.19, 6.0, or 6.1 kernel lines.
  • Verify distribution backports before assuming version numbers alone are vulnerable.
  • Track kernel warning telemetry for related mm/uffd anomalies.

Validation and detection

  • Inventory kernel versions across servers, appliances, containers hosts, and embedded Linux systems.
  • Check kernel build configuration for CONFIG_PTE_MARKER_UFFD_WP status where available.
  • Confirm whether vendor kernel packages include the referenced stable commits.
  • Review kernel logs for recurring warnings in mm/uffd or pte marker paths.
  • Document any unsupported kernels requiring upgrade planning.
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

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-2022-50448 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
0ADP providers
4Source links

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxb1f9e876862d8f7176299ec4fb2108bc1045cbc8, b1f9e876862d8f7176299ec4fb2108bc1045cbc8, b1f9e876862d8f7176299ec4fb2108bc1045cbc8unaffected
LinuxLinux5.19, 0, 5.19.17, 6.0.3, 6.1affected
Weakness

CWE details

No CWE listed

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