CVE-2022-49788

Kernel information disclosure via uninitialized VMCI padding

Published May 1, 2025 · Updated May 11, 2026

Information disclosure in Linux 3.9 and later allows local users to read uninitialized kernel data through a VMCI host ioctl. qp_notify_peer() leaves four padding bytes in struct vmci_event_qp uninitialized, and vmci_host_do_receive_datagram() copies the full structure to user space. A local account with access to the VMCI device is required, and each affected event exposes four bytes of kernel memory.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux 3.9 and later allows local users to read uninitialized kernel data through a VMCI host ioctl. qp_notify_peer() leaves four padding bytes in struct vmci_event_qp uninitialized, and vmci_host_do_receive_datagram() copies the full structure to user space. A local account with access to the VMCI device is required, and each affected event exposes four bytes of kernel memory.

The record

CVE
CVE-2022-49788
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=06164d2b72aa752ce4633184b3e0d97601017135 <5a275528025ae4bc7e2232866856dfebf84b2fad
  2. Affected versionversion=06164d2b72aa752ce4633184b3e0d97601017135 <62634b43d3c4e1bf62fd540196f7081bf0885c0a
  3. Affected versionversion=06164d2b72aa752ce4633184b3e0d97601017135 <76c50d77b928a33e5290aaa9fdc10e88254ff8c7
  4. Affected versionversion=06164d2b72aa752ce4633184b3e0d97601017135 <7ccf7229b96fadc3a185d1391f814a604c7ef609
  5. Affected versionversion=06164d2b72aa752ce4633184b3e0d97601017135 <8e2f33c598370bcf828bab4d667d1d38bcd3c57d
  6. Affected versionversion=06164d2b72aa752ce4633184b3e0d97601017135 <e5b0d06d9b10f5f43101bd6598b076c347f9295f
  7. Affected versionversion=06164d2b72aa752ce4633184b3e0d97601017135 <e7061dd1fef2dfb6458cd521aef27aa66f510d31
  8. Affected versionversion=06164d2b72aa752ce4633184b3e0d97601017135 <f04586c2315cfd03d72ad0395705435e7ed07b1a
  9. Affected versionversion=3.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=06164d2b72aa752ce4633184b3e0d97601017135 <5a275528025ae4bc7e2232866856dfebf84b2fad; version=06164d2b72aa752ce4633184b3e0d97601017135 <62634b43d3c4e1bf62fd540196f7081bf0885c0a; version=06164d2b72aa752ce4633184b3e0d97601017135 <76c50d77b928a33e5290aaa9fdc10e88254ff8c7; version=06164d2b72aa752ce4633184b3e0d97601017135 <7ccf7229b96fadc3a185d1391f814a604c7ef609; version=06164d2b72aa752ce4633184b3e0d97601017135 <8e2f33c598370bcf828bab4d667d1d38bcd3c57d; version=06164d2b72aa752ce4633184b3e0d97601017135 <e5b0d06d9b10f5f43101bd6598b076c347f9295f; version=06164d2b72aa752ce4633184b3e0d97601017135 <e7061dd1fef2dfb6458cd521aef27aa66f510d31; version=06164d2b72aa752ce4633184b3e0d97601017135 <f04586c2315cfd03d72ad0395705435e7ed07b1a; version=3.9

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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