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CVE Record

CVE-2025-39781: parisc: Drop WARN_ON_ONCE() from flush_cache_vmap

In the Linux kernel, the following vulnerability has been resolved: parisc: Drop WARN_ON_ONCE() from flush_cache_vmap I have observed warning to occassionally trigger.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This CVE concerns a Linux kernel issue in the PA-RISC architecture code. The public description says a kernel warning in flush_cache_vmap could occasionally trigger, and the kernel fix removes that warning. The sources do not describe data theft, privilege escalation, denial of service, CVSS score, or business impact.

Executive priority

Treat as a targeted kernel maintenance item, not an emergency, unless the organization runs PA-RISC Linux systems. The public record lacks severity and impact details, so confirm exposure first and follow vendor kernel guidance.

Technical view

The affected area is Linux kernel parisc cache handling, specifically flush_cache_vmap. The stated resolution is to drop WARN_ON_ONCE() after occasional warning triggers were observed. The bundle provides upstream stable commit references but no CWE, CVSS vector, exploitability analysis, or detailed affected-version range semantics.

Likely exposure

Exposure appears limited to Linux systems using the parisc/PA-RISC kernel architecture and versions covered by the CVE metadata. Most environments without PA-RISC Linux systems are unlikely to be affected, but version-range evidence in the bundle is incomplete.

Exploitation context

No active exploitation is cited. The CVE is not marked KEV, and the provided sources do not describe exploit availability, attacker prerequisites, or a weaponizable security impact.

Researcher notes

Evidence is sparse. The title and description identify a warning removal in parisc flush_cache_vmap, but do not establish exploitability, security impact, or precise vulnerable ranges. The stable commit references are the strongest remediation signal.

Mitigation direction

  • Identify any Linux PA-RISC systems in asset inventory.
  • Check distribution and upstream kernel advisories for CVE-2025-39781 applicability.
  • Apply kernel updates containing the referenced stable fixes when available.
  • Prioritize remediation based on actual PA-RISC exposure and vendor severity guidance.

Validation and detection

  • Confirm whether systems run the Linux parisc architecture.
  • Compare kernel versions against vendor advisories and CVE metadata.
  • Review kernel changelogs for the referenced stable commits.
  • Check logs for recurring flush_cache_vmap warnings if PA-RISC systems exist.
Prepared
Confidence
medium
Sources
6

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-2025-39781 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
5Source 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
LinuxLinux5bf196f1936bf93df31112fbdfb78c03537c07b0, 72d95924ee35c8cd16ef52f912483ee938a34d49, 72d95924ee35c8cd16ef52f912483ee938a34d49, 72d95924ee35c8cd16ef52f912483ee938a34d49, d66f2607d89f760cdffed88b22f309c895a2af20, 6.6.35, 6.9.6unaffected
LinuxLinux6.10, 0, 6.6.103, 6.12.44, 6.16.4, 6.17affected
Weakness

CWE details

No CWE listed

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