CVE-2022-0812

Kernel-memory disclosure via miscalculated RPC headers

Published Aug 29, 2022 · Updated Feb 13, 2025

Information disclosure in Linux Kernel before 5.8-rc6 allows local users to read kernel memory through NFS over RDMA file reads. The rpcrdma_max_call_header_size and rpcrdma_max_reply_header_size functions overwrite, rather than accumulate, header-size terms, undersizing RPC payload headers. A normal local user must read a short file through NFS over RDMA against a susceptible server; disclosed bytes can include other file contents or kernel data.

CVSS severity4.3
Medium
EPSS probability1.39%
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 Kernel before 5.8-rc6 allows local users to read kernel memory through NFS over RDMA file reads. The rpcrdma_max_call_header_size and rpcrdma_max_reply_header_size functions overwrite, rather than accumulate, header-size terms, undersizing RPC payload headers. A normal local user must read a short file through NFS over RDMA against a susceptible server; disclosed bytes can include other file contents or kernel data.

The record

CVE
CVE-2022-0812
Published
Aug 29, 2022
Updated
Feb 13, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-200, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=Fixed in v5.8-rc6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Fixed in v5.8-rc6

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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-200Exposure of Sensitive Information to an Unauthorized Actor
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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