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CVE Record

CVE-2025-22000: mm/huge_memory: drop beyond-EOF folios with the right number of refs

In the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: drop beyond-EOF folios with the right number of refs When an after-split folio is large and needs to be dropped due to EOF, folio_put_refs(folio, folio_nr_pages(folio)) should be used to drop all page cache refs. Otherwise, the folio will not be freed, causing memory leak. This leak would happen on a filesystem with blocksize > page_size and a truncate is performed, where the blocksize makes folios split to >0 order ones, causing truncated folios not being freed.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2025-22000 is a Linux kernel memory leak in huge memory handling during file truncation. A local user could trigger conditions that fail to free cached memory, potentially reducing system availability. It does not affect confidentiality or integrity according to the CVSS vector.

Executive priority

Treat as a routine but important availability fix. Prioritize shared Linux servers, multi-tenant systems, and environments running untrusted local workloads. This is not currently evidenced as remotely exploitable or actively exploited.

Technical view

The bug is in mm/huge_memory. After a folio split, large beyond-EOF folios may be dropped with too few references, leaving page-cache references behind. This can leak memory on filesystems with block size greater than page size when truncate causes folios to split into nonzero-order folios.

Likely exposure

Exposure is limited to Linux systems running affected kernel versions and using filesystem conditions described by the kernel notice. The issue requires local access with low privileges. Internet-facing remote exploitation is not indicated by the provided sources.

Exploitation context

The CVSS vector is local, low complexity, low privilege, no user interaction, with high availability impact. CISA KEV is false in the provided data, and no cited source states active exploitation.

Researcher notes

Evidence is limited to the CVE record and Linux stable commits. The vulnerable condition is specific: truncate on filesystems with blocksize greater than page size causing split folios above order zero. Do not assume all Linux deployments are practically exposed without confirming filesystem and kernel details.

Mitigation direction

  • Review Linux vendor advisories for your distribution and kernel branch.
  • Update to a kernel release containing the referenced stable fixes.
  • Prioritize systems allowing local users or untrusted workloads.
  • If patching is delayed, monitor memory pressure on affected hosts.

Validation and detection

  • Inventory Linux kernel versions across servers and workloads.
  • Compare running kernels against vendor advisories for CVE-2025-22000.
  • Check whether referenced stable commits are included in your kernel build.
  • Identify systems using filesystems with block size greater than page size.
Prepared
Confidence
high
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

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cve · low confidence lookup

CVE-2025-22000 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

1CVSS vectors
3Timeline events
1ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2025-22000Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxc010d47f107f609b9f4d6a103b6dfc53889049e9, c010d47f107f609b9f4d6a103b6dfc53889049e9, c010d47f107f609b9f4d6a103b6dfc53889049e9unaffected
LinuxLinux6.9, 0, 6.12.21, 6.13.9, 6.14affected
Weakness

CWE details

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

CWE-401 · source CWE mapping

Missing Release of Memory after Effective Lifetime

Missing Release of Memory after Effective Lifetime represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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