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CVE Record

CVE-2022-49962: xhci: Fix null pointer dereference in remove if xHC has only one roothub

In the Linux kernel, the following vulnerability has been resolved: xhci: Fix null pointer dereference in remove if xHC has only one roothub The remove path in xhci platform driver tries to remove and put both main and shared hcds even if only a main hcd exists (one roothub) This causes a null pointer dereference in reboot for those controllers. Check that the shared_hcd exists before trying to remove it.

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 crash affected systems during reboot when a specific xHCI USB controller configuration has only one root hub. The public sources describe a null pointer dereference in the controller removal path. No CVSS score or active exploitation evidence is provided.

Executive priority

Treat as a reliability and availability risk until vendor guidance confirms exposure. Prioritize operationally critical Linux systems, appliances, and embedded platforms where reboot failures could affect service restoration or maintenance windows.

Technical view

The xHCI platform driver remove path attempted to remove and release both main and shared HCD objects even when shared_hcd did not exist. For one-roothub xHC controllers, that missing null check could trigger a null pointer dereference during reboot. The fix checks shared_hcd before removal.

Likely exposure

Exposure appears limited to Linux kernels and xHCI platform controllers matching the one-roothub condition. The source bundle lists Linux kernel versions including 5.19, 5.19.8, and 6.0, plus a kernel commit identifier, but distro-specific affected ranges are not established here.

Exploitation context

The CVE is not listed as KEV in the provided data. The sources describe a reboot-time crash condition, not remote code execution, privilege escalation, or confirmed exploitation. Practical exploitability and attack prerequisites are not detailed in the bundle.

Researcher notes

Evidence is narrow: the bundle provides the kernel description and two stable commit references, but no CVSS, CWE, exploit report, or distribution advisory. Avoid broad claims beyond Linux xHCI platform-driver reboot behavior and the shared_hcd null-check fix.

Mitigation direction

  • Review upstream Linux stable fixes referenced for this CVE.
  • Map running kernels to vendor advisories and patched distro builds.
  • Prioritize systems with xHCI platform controllers and reboot reliability requirements.
  • Use vendor-supported kernel updates rather than ad hoc patching.
  • Monitor Linux and distribution guidance for clarified affected ranges.

Validation and detection

  • Inventory Linux kernel versions across servers and embedded devices.
  • Identify systems using xHCI platform drivers or affected hardware configurations.
  • Check whether vendor kernels include the referenced stable commits.
  • Review reboot crash logs for xHCI remove-path null dereference indicators.
  • Confirm remediation through vendor package or kernel build metadata.
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

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ATT&CK lookup starting points

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CVE-2022-49962 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
0ADP providers
3Source links

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxe0fe986972f5b6b12086c73569206dd29c520be9, e0fe986972f5b6b12086c73569206dd29c520be9unaffected
LinuxLinux5.19, 0, 5.19.8, 6.0affected
Weakness

CWE details

No CWE listed

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