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CVE Record

CVE-2025-22114: btrfs: don't clobber ret in btrfs_validate_super()

In the Linux kernel, the following vulnerability has been resolved: btrfs: don't clobber ret in btrfs_validate_super() Commit 2a9bb78cfd36 ("btrfs: validate system chunk array at btrfs_validate_super()") introduces a call to validate_sys_chunk_array() in btrfs_validate_super(), which clobbers the value of ret set earlier. This has the effect of negating the validity checks done earlier, making it so btrfs could potentially try to mount invalid filesystems.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux kernel Btrfs validation error can allow an invalid filesystem to pass checks and be mounted. On affected systems, this may threaten confidentiality, integrity, and availability. The issue requires local access according to the supplied CVSS vector, so it is most urgent where users or services can introduce and mount Btrfs filesystems.

Executive priority

Prioritize systems where tenants, users, appliances, or automated workflows can introduce filesystem images. Patch through normal emergency kernel processes after vendor confirmation. Systems without Btrfs use or untrusted mount paths are lower priority, but should still be inventoried because the supplied affected-version information is incomplete.

Technical view

In btrfs_validate_super(), validate_sys_chunk_array() overwrites an earlier return value. This can discard failures from preceding superblock validity checks, allowing the kernel to attempt mounting a malformed Btrfs filesystem. The supplied CVSS 3.1 score is 7.8 with local, low-privilege attack conditions and high potential impact.

Likely exposure

Potential exposure includes Linux systems running affected 6.14-series code or builds containing commit 2a9bb78cfd36, particularly systems that process locally supplied Btrfs filesystems. The supplied version data is ambiguous, so distribution kernel package status must be confirmed with the relevant vendor.

Exploitation context

The supplied record does not identify active exploitation, and CVE-2025-22114 is not marked as CISA KEV. That does not prove exploitation is absent. The CVSS vector indicates local access and low privileges, while the described trigger involves an invalid Btrfs filesystem reaching mount validation.

Researcher notes

The core defect is return-value clobbering that suppresses earlier validation failures. The bundle supplies two Linux stable commit references but does not clearly map them to every affected or fixed release. Assess downstream backports by commit presence, not version strings alone. No CWE or confirmed exploitation evidence is provided.

Mitigation direction

  • Apply a vendor-supported kernel containing the appropriate upstream stable correction.
  • Consult the Linux distribution vendor for affected package and fixed-build guidance.
  • Restrict untrusted users and services from supplying or mounting Btrfs filesystems.
  • Avoid mounting untrusted Btrfs images until affected systems are remediated.

Validation and detection

  • Inventory kernel versions and identify systems using or accepting Btrfs filesystems.
  • Check whether each kernel contains the introducing commit or an applicable stable correction.
  • Confirm distribution package status against current vendor security guidance.
  • After updating, verify the running kernel matches the installed remediated build.
Prepared
Confidence
medium
Sources
4

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-2025-22114 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
0ADP providers
3Source links

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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2025-22114Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux2a9bb78cfd367fdeff74f15b1e98969912292d9e, 2a9bb78cfd367fdeff74f15b1e98969912292d9eunaffected
LinuxLinux6.14, 0, 6.14.2, 6.15affected
Weakness

CWE details

No CWE listed

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