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CVE Record

CVE-2022-49225: mt76: mt7921s: fix a possible memory leak in mt7921_load_patch

In the Linux kernel, the following vulnerability has been resolved: mt76: mt7921s: fix a possible memory leak in mt7921_load_patch Always release fw data at the end of mt7921_load_patch routine.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-49225 is a Linux kernel issue in the MediaTek mt76 MT7921S wireless driver. A firmware-loading routine could leak memory. The main business impact is potential local denial of service, not data theft or tampering. Public sources provided do not show active exploitation.

Executive priority

Treat as a moderate availability risk. Remediate through normal kernel maintenance, with higher priority for laptops, embedded systems, or operational devices using the affected wireless driver.

Technical view

The vulnerability is CWE-401 in mt7921_load_patch: firmware data was not always released at routine exit. CVSS 3.1 is 5.5, local attack vector, low privileges, no user interaction, and high availability impact. Referenced stable commits release firmware data at the end of the routine.

Likely exposure

Exposure is most likely on Linux systems using the mt76 MT7921S wireless driver and kernel builds containing the affected code. Exact exposure depends on vendor kernel backports and whether the referenced fixes are present.

Exploitation context

The CVSS vector indicates a local, low-privileged path with no user interaction. The documented impact is availability through memory exhaustion. The source bundle has no KEV listing and no cited evidence of active exploitation.

Researcher notes

The record is narrow: a kernel driver memory leak fixed by upstream stable commits. Public details do not describe a broader exploit chain. Version metadata is limited, so distro-specific validation is important.

Mitigation direction

  • Deploy a vendor-supported kernel containing the referenced upstream stable fixes.
  • Check Linux distribution advisories for backported fixes matching your kernel package.
  • Prioritize systems using MediaTek MT7921S wireless hardware or mt76 drivers.
  • If no vendor advisory exists, track vendor guidance before applying custom changes.

Validation and detection

  • Inventory Linux kernel versions and vendor package release notes.
  • Confirm whether mt76 MT7921S driver support is present on affected systems.
  • Verify whether fixes b301043384c5 or 11005b18f453 are included or backported.
  • Document systems still running affected kernel builds for remediation tracking.
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

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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cwe · low confidence lookup

CWE-401: Exact CWE lookup

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cve · low confidence lookup

CVE-2022-49225 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
3Source 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-2022-49225Attack 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
LinuxLinux78b217580c50994ae22dde4ecaaf147de0f355f6, 78b217580c50994ae22dde4ecaaf147de0f355f6unaffected
LinuxLinux5.17, 0, 5.17.2, 5.18affected
Weakness

CWE details

CWE-401

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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