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CVE Record

CVE-2025-39918: wifi: mt76: fix linked list corruption

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: fix linked list corruption Never leave scheduled wcid entries on the temporary on-stack list

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux Wi-Fi driver flaw can corrupt linked-list state when temporary scheduling data is mishandled. The supplied CVSS assessment indicates potentially severe confidentiality, integrity, and availability impact. Exposure appears limited to systems using affected Linux kernels and the mt76 wireless driver, with an attacker requiring adjacent-network access.

Executive priority

Treat this as a high-priority patching issue for Wi-Fi-enabled Linux fleets using mt76, especially exposed endpoints and appliances. First confirm driver use; unaffected hardware should not receive the same urgency. Because exploitation evidence is absent, prioritize verified exposure and supported kernel updates rather than emergency fleet-wide disruption.

Technical view

The mt76 kernel driver could leave scheduled WCID entries linked to a temporary on-stack list, causing linked-list corruption after that list becomes invalid. The supplied record scores this CVSS 3.1 at 8.8 with adjacent-network access, low complexity, no privileges, and no user interaction. The referenced stable-kernel commits implement the correction.

Likely exposure

Prioritize Linux endpoints, appliances, and embedded systems where the mt76 driver supports active Wi-Fi hardware. The bundle lists affected releases including 6.12, 6.12.46, 6.16.6, and 6.17, but does not clearly express exact range boundaries. Distribution backports may change exposure independently of the displayed kernel version.

Exploitation context

The CVSS vector describes an adjacent-network attack requiring no privileges or user interaction. The bundle does not establish a specific attack mechanism beyond linked-list corruption. This CVE is not identified as KEV, and no supplied source reports active exploitation, public exploit availability, or confirmed real-world attacks.

Researcher notes

The essential invariant is that scheduled WCID entries must not remain attached to a temporary on-stack list. The bundle provides three stable-tree correction commits but incomplete version-range semantics and no CWE. Assess backported vendor kernels by commit or advisory evidence, not version strings alone. Memory-corruption consequences are plausible, but the sources do not document a demonstrated exploitation primitive.

Mitigation direction

  • Install a supported vendor kernel containing the applicable referenced stable-kernel fix.
  • Check distribution advisories because vendors may backport fixes without changing to an upstream fixed version.
  • If updates are delayed, seek vendor-supported guidance for reducing exposure to affected mt76 wireless functionality.

Validation and detection

  • Inventory Linux kernel versions on systems with active wireless hardware.
  • Confirm whether an mt76 driver is installed, loaded, and associated with an active interface.
  • Review vendor package changelogs for CVE-2025-39918 or the referenced commit identifiers.
  • After updating and rebooting, verify the running kernel package includes the vendor's correction.
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-2025-39918 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:A/AC:L/PR:N/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.

2CVSS 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

2 official scores

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
8.8CVSS 3.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9Linux
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

8.8High
CVSS 3.1 vector shape for CVE-2025-39918Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:A/AC:L/PR:N/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.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux0b3be9d1d34e21dada69c539fbf51a5fe868028a, 0b3be9d1d34e21dada69c539fbf51a5fe868028a, 0b3be9d1d34e21dada69c539fbf51a5fe868028aunaffected
LinuxLinux6.12, 0, 6.12.46, 6.16.6, 6.17affected
Weakness

CWE details

No CWE listed

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