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CVE Record

CVE-2022-49422: dmaengine: idxd: Fix the error handling path in idxd_cdev_register()

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Fix the error handling path in idxd_cdev_register() If a call to alloc_chrdev_region() fails, the already allocated resources are leaking. Add the needed error handling path to fix the leak.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2022-49422 is a Linux kernel resource leak in the idxd DMA engine driver error path. If a character device allocation fails during registration, previously allocated resources are not released. Public sources do not provide CVSS, confirmed impact, or active exploitation evidence.

Executive priority

Treat as routine kernel maintenance unless your environment heavily depends on affected idxd functionality. There is no public evidence of active exploitation, but kernel resource leaks can affect stability and should be corrected through normal patch cycles.

Technical view

The issue is in idxd_cdev_register(). When alloc_chrdev_region() fails, the function did not unwind already allocated resources. Kernel stable commits add the missing error handling path. The CVE record lists Linux kernel versions including 5.6, 5.10.121, 5.15.46, 5.17.14, 5.18.3, and 5.19 as affected, but version range details are limited.

Likely exposure

Exposure appears limited to Linux systems running affected kernel builds with the idxd DMA engine driver code relevant. The available record does not identify distributions, configurations, or whether the driver must be loaded or reachable by unprivileged users.

Exploitation context

No CISA KEV listing or cited source indicates active exploitation. The described condition requires alloc_chrdev_region() failure during idxd character device registration, suggesting reliability and exploitability depend on local kernel state and configuration. Public evidence only supports a resource leak conclusion.

Researcher notes

The public description is narrow: a missing cleanup path after alloc_chrdev_region() failure. No CWE, CVSS, proof of concept, privilege requirement, or distribution matrix is provided. Validate impact against kernel source, backport status, and whether idxd registration failure can be attacker-influenced.

Mitigation direction

  • Update to a Linux kernel or distribution package containing the referenced stable fix.
  • Check your Linux vendor advisory for exact affected and fixed package versions.
  • Prioritize systems using kernels and hardware configurations that enable idxd functionality.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and images.
  • Confirm whether vendor packages include one of the referenced stable commits.
  • Review kernel configuration or module inventory for idxd driver presence.
  • Track CVE and vendor advisories for updated severity or impact details.
Prepared
Confidence
medium
Sources
7

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-2022-49422 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
6Source 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
LinuxLinux42d279f9137ab7d5503836baec2739284b278d8f, 42d279f9137ab7d5503836baec2739284b278d8f, 42d279f9137ab7d5503836baec2739284b278d8f, 42d279f9137ab7d5503836baec2739284b278d8f, 42d279f9137ab7d5503836baec2739284b278d8funaffected
LinuxLinux5.6, 0, 5.10.121, 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.