LiveActive security incident?Get immediate response
CVE Record

CVE-2022-49454: PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup()

In the Linux kernel, the following vulnerability has been resolved: PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup() The of_find_compatible_node() function returns a node pointer with refcount incremented, We should use of_node_put() on it when done Add the missing of_node_put() to release the refcount.

MediumCVSS 5.5Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel availability issue in the MediaTek PCIe code. A missing reference release can leak kernel object references during subsystem power-up. The published CVSS score is medium, but the impact is availability-only and requires local, low-privileged access.

Executive priority

Handle through normal kernel patch management unless affected MediaTek-based systems support critical services. There is no source evidence of active exploitation, but availability impact can matter for embedded, appliance, or edge deployments using the affected driver path.

Technical view

The issue is a refcount leak in mtk_pcie_subsys_powerup(). of_find_compatible_node() increments a device-tree node reference, but the affected code did not call of_node_put() when finished. Upstream stable fixes add the missing release. CVSS:3.1 rates it AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Likely exposure

Exposure is most likely on Linux systems running affected kernel versions with the MediaTek PCIe driver path present or enabled. The source bundle lists Linux 5.15-era through 5.19-related affected version data, but exact distro package exposure must be confirmed from vendor advisories or backport notes.

Exploitation context

The provided sources do not report active exploitation, and the CVE is not listed as KEV. Based on CVSS, exploitation requires local access with low privileges and targets availability, not confidentiality or integrity. No public exploit details are provided in the source bundle.

Researcher notes

The root cause is narrow: a missing of_node_put() after of_find_compatible_node(). The public bundle does not provide a CWE, exploit method, or detailed affected platform list beyond Linux kernel version data and upstream stable commit references.

Mitigation direction

  • Update to a kernel package containing the referenced upstream stable fix.
  • Check distribution or device vendor advisories for backported CVE-2022-49454 fixes.
  • Prioritize systems where MediaTek PCIe support is enabled or relevant.
  • Treat vendor-maintained kernels as authoritative for fixed package versions.

Validation and detection

  • Inventory Linux kernel versions across affected device fleets.
  • Confirm whether the MediaTek PCIe driver code is built or enabled.
  • Map installed kernels to vendor advisories or referenced stable commits.
  • Review operational monitoring for availability symptoms on relevant systems.
Prepared
Confidence
medium
Sources
6

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2022-49454 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
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
5Source 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-2022-49454Attack 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
LinuxLinux87e8657ba99cac87b84c7f8ead91b44d88345504, 87e8657ba99cac87b84c7f8ead91b44d88345504, 87e8657ba99cac87b84c7f8ead91b44d88345504, 87e8657ba99cac87b84c7f8ead91b44d88345504unaffected
LinuxLinux5.15, 0, 5.15.46, 5.17.14, 5.18.3, 5.19affected
Weakness

CWE details

No CWE listed

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