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CVE Record

CVE-2022-48952: PCI: mt7621: Add sentinel to quirks table

In the Linux kernel, the following vulnerability has been resolved: PCI: mt7621: Add sentinel to quirks table Current driver is missing a sentinel in the struct soc_device_attribute array, which causes an oops when assessed by the soc_device_match(mt7621_pcie_quirks_match) call. This was only exposed once the CONFIG_SOC_MT7621 mt7621 soc_dev_attr was fixed to register the SOC as a device, in: commit 7c18b64bba3b ("mips: ralink: mt7621: do not use kzalloc too early") Fix it by adding the required sentinel.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can trigger a kernel oops in the MediaTek/Ralink MT7621 PCI driver because a hardware-matching table lacks its required ending marker. The sources describe a reliability failure, not data theft or remote compromise. Business urgency depends on whether your products or appliances run affected Linux kernels on MT7621-based hardware.

Executive priority

Treat this as a targeted availability and stability issue for MT7621-based Linux devices. It is not supported by the supplied evidence as actively exploited or remotely weaponized, but affected embedded appliances may need timely vendor firmware updates.

Technical view

The mt7621 PCI driver’s soc_device_attribute quirks table was missing a sentinel entry. After CONFIG_SOC_MT7621 began registering the SoC as a device, soc_device_match(mt7621_pcie_quirks_match) could read past the array and cause an oops. Stable kernel commits add the required sentinel.

Likely exposure

Most relevant exposure is Linux systems built for MT7621 SoC platforms with the mt7621 PCI path enabled. The bundle lists Linux kernel versions and stable commits but does not provide distribution-specific package names, CPEs, or a complete affected-version matrix.

Exploitation context

The provided sources do not show active exploitation, public exploit activity, or KEV listing. The described failure mode is a kernel oops caused by driver table handling after a related MT7621 registration change exposed the bug.

Researcher notes

The key technical evidence is narrow: missing sentinel in struct soc_device_attribute array, exposed after commit 7c18b64bba3b changed MT7621 SoC registration behavior. Severity, CVSS, CWE, CPEs, and distribution package mappings are not provided in the bundle.

Mitigation direction

  • Apply a vendor kernel update containing the referenced stable fixes.
  • Check embedded Linux vendor guidance for MT7621-based products.
  • Backport the sentinel fix only through normal kernel maintenance processes.
  • Prioritize systems where kernel oopses affect service availability.

Validation and detection

  • Inventory Linux kernels used on MT7621-based hardware.
  • Check whether referenced stable commits are present in your kernel tree.
  • Confirm CONFIG_SOC_MT7621 and mt7621 PCI driver usage.
  • Review kernel logs for oopses around soc_device_match or mt7621_pcie.
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.

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CVE-2022-48952 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
5Source 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
LinuxLinuxb483b4e4d3f6bfd5089b9e6dc9ba259879c6ce6f, b483b4e4d3f6bfd5089b9e6dc9ba259879c6ce6f, b483b4e4d3f6bfd5089b9e6dc9ba259879c6ce6f, b483b4e4d3f6bfd5089b9e6dc9ba259879c6ce6f, 21fd877300b01d25c5807c327848fdc7c813cf0eunaffected
LinuxLinux5.5, 0, 5.15.86, 6.0.15, 6.1.1, 6.2affected
Weakness

CWE details

No CWE listed

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