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CVE Record

CVE-2022-48949: igb: Initialize mailbox message for VF reset

In the Linux kernel, the following vulnerability has been resolved: igb: Initialize mailbox message for VF reset When a MAC address is not assigned to the VF, that portion of the message sent to the VF is not set. The memory, however, is allocated from the stack meaning that information may be leaked to the VM. Initialize the message buffer to 0 so that no information is passed to the VM in this case.

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 leak host stack memory to a virtual machine in a specific network virtualization path. It occurs in the igb driver when a virtual function is reset without a MAC address assigned. The source bundle does not provide CVSS, severity, or exploitation evidence.

Executive priority

Treat this as a targeted infrastructure patching item, not an internet-wide emergency. Prioritize multi-tenant or less-trusted virtualization hosts using igb SR-IOV, because the issue crosses a VM boundary and may disclose host memory fragments.

Technical view

The igb driver sent a mailbox message to a VF during reset without fully initializing the MAC-address portion when no VF MAC was assigned. Because the buffer came from stack memory, uninitialized bytes could be exposed to the VM. The fix initializes the message buffer to zero.

Likely exposure

Exposure is most likely on Linux systems using the igb network driver with SR-IOV virtual functions presented to VMs. Systems not using igb, SR-IOV, or VF reset paths are less likely to be exposed based on the provided description.

Exploitation context

The source bundle marks KEV as false and provides no cited evidence of active exploitation or public weaponization. The issue is a guest-visible information disclosure, not described as remote code execution or privilege escalation in the supplied sources.

Researcher notes

Evidence is limited to the CVE description and Linux stable references. The affected-version data is incomplete in the prompt and no CVSS or CWE is supplied. Analysis should focus on igb SR-IOV mailbox reset handling and whether the zero-initialization fix is present.

Mitigation direction

  • Apply Linux kernel updates that include the referenced igb stable fixes.
  • Map your distribution kernel package to the listed upstream stable commits.
  • Check vendor or distribution guidance for supported fixed kernel versions.
  • Prioritize hosts that expose igb SR-IOV VFs to untrusted VMs.

Validation and detection

  • Inventory Linux hosts using the igb driver.
  • Identify hosts with SR-IOV VFs assigned to virtual machines.
  • Compare running kernel versions against vendor fixed-package guidance.
  • Confirm the igb VF reset fix is present in your kernel source or changelog.
Prepared
Confidence
medium
Sources
10

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-2022-48949 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
9Source 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
LinuxLinux6ddbc4cf1f4d5a3a58b4223c80881f299dae3774, 6ddbc4cf1f4d5a3a58b4223c80881f299dae3774, 6ddbc4cf1f4d5a3a58b4223c80881f299dae3774, 6ddbc4cf1f4d5a3a58b4223c80881f299dae3774, 6ddbc4cf1f4d5a3a58b4223c80881f299dae3774, 6ddbc4cf1f4d5a3a58b4223c80881f299dae3774, 6ddbc4cf1f4d5a3a58b4223c80881f299dae3774, 6ddbc4cf1f4d5a3a58b4223c80881f299dae3774unaffected
LinuxLinux4.0, 0, 4.14.303, 4.19.270, 5.4.229, 5.10.161, 5.15.85, 6.0.15, 6.1.1, 6.2affected
Weakness

CWE details

No CWE listed

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