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CVE Record

CVE-2024-46860: wifi: mt76: mt7921: fix NULL pointer access in mt7921_ipv6_addr_change

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: fix NULL pointer access in mt7921_ipv6_addr_change When disabling wifi mt7921_ipv6_addr_change() is called as a notifier. At this point mvif->phy is already NULL so we cannot use it here.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel Wi-Fi driver crash-class bug tied to MediaTek MT7921 support. When Wi-Fi is being disabled, kernel code may access a NULL pointer because a related driver structure has already been cleared. Business impact is most likely endpoint or device instability, not confirmed compromise.

Executive priority

Treat this as routine but time-bound kernel maintenance for affected endpoints. It does not justify emergency response from the supplied evidence, but recurring endpoint crashes can affect operations and should be removed through normal patch cycles.

Technical view

CVE-2024-46860 affects the Linux mt76 mt7921 driver path mt7921_ipv6_addr_change(). During Wi-Fi disable handling, the notifier can run after mvif->phy is NULL, causing NULL pointer access. The source says the vulnerability has been resolved in Linux stable commits, but provides no CVSS, CWE, or detailed distro mapping.

Likely exposure

Exposure is likely limited to Linux systems using the mt76/mt7921 MediaTek Wi-Fi driver and affected kernel builds. Servers, VMs, and appliances without that hardware or driver path are unlikely to be exposed. The supplied version data is incomplete for precise distribution-level impact.

Exploitation context

The bundle does not show active exploitation, public exploit evidence, or CISA KEV listing. The described condition occurs when Wi-Fi is disabled, suggesting a local or device-state-triggered reliability issue. No remote attack path is established in the provided sources.

Researcher notes

Evidence supports a NULL pointer dereference in the mt7921 IPv6 address change notifier during Wi-Fi teardown. Severity and exploitation remain unclear because the CVE record provides no CVSS, CWE, exploit status, or complete downstream version mapping.

Mitigation direction

  • Apply Linux vendor kernel updates that include the referenced stable fixes.
  • Prioritize laptops and endpoints with MediaTek MT7921 Wi-Fi hardware.
  • Track distribution advisories for exact package names and fixed versions.
  • For unmanaged devices, confirm kernel builds include the stable commit fixes.

Validation and detection

  • Inventory Linux systems with MediaTek MT7921 or mt76 driver usage.
  • Map running kernel packages to vendor advisories or stable commit inclusion.
  • Review kernel logs for related NULL pointer or Wi-Fi disable crashes.
  • Confirm updated kernels boot and Wi-Fi disable paths no longer crash.
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-2024-46860 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
1ADP providers
4Source links

SSVC decision data

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

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
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux7bc04215a66b60e198aecaee8418f6d79fa19faa, 7bc04215a66b60e198aecaee8418f6d79fa19faa, 7bc04215a66b60e198aecaee8418f6d79fa19faaunaffected
LinuxLinux4.16, 0, 6.6.52, 6.10.11, 6.11affected
Weakness

CWE details

No CWE listed

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