CVE-2022-20008

Kernel heap disclosure via misreported SD-card reads

Published May 10, 2022 · Updated Aug 3, 2024

Information disclosure in the Linux kernel's SD/MMC block driver allows local users to read kernel heap data via an erroring SD card. On a command error with retries remaining, mmc_blk_read_single can pass a stale success status to blk_update_request, reporting a completed read even though the device returned no data. An SD card that induces CRC or command-rejection errors is required; no additional execution privileges or user interaction are needed.

CVSS severity4.6
Medium
EPSS probability0.37%
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 the Linux kernel's SD/MMC block driver allows local users to read kernel heap data via an erroring SD card. On a command error with retries remaining, mmc_blk_read_single can pass a stale success status to blk_update_request, reporting a completed read even though the device returned no data. An SD card that induces CRC or command-rejection errors is required; no additional execution privileges or user interaction are needed.

The record

CVE
CVE-2022-20008
Published
May 10, 2022
Updated
Aug 3, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1005
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=Android kernel

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Android kernel

Published CVSS scores

4.6NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
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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