CVE-2022-50774

DMA-API warning via overlapping write mappings

Published Dec 24, 2025 · Updated Dec 24, 2025

Incorrect DMA direction handling in the QAT crypto driver in Linux allows attackers to trigger a DMA-API warning during crypto self-tests. The qat_alg_sgl_to_bufl mapping logic applies DMA_BIDIRECTIONAL to separate input and output scatter lists, creating unsupported overlapping write mappings. The condition requires QAT crypto hardware, CONFIG_DMA_API_DEBUG, and a crypto self-test; published evidence reports a warning but no crash, data compromise, or remote effect.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Incorrect DMA direction handling in the QAT crypto driver in Linux allows attackers to trigger a DMA-API warning during crypto self-tests. The qat_alg_sgl_to_bufl mapping logic applies DMA_BIDIRECTIONAL to separate input and output scatter lists, creating unsupported overlapping write mappings. The condition requires QAT crypto hardware, CONFIG_DMA_API_DEBUG, and a crypto self-test; published evidence reports a warning but no crash, data compromise, or remote effect.

The record

CVE
CVE-2022-50774
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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?

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

  1. Affected versionversion=3.17
  2. Affected versionversion=d370cec3219490656d72f5ae6e5df32c113c5a44 <1f1ab76e251521bd2fa5244473efcf663792745d
  3. Affected versionversion=d370cec3219490656d72f5ae6e5df32c113c5a44 <426d5bc089e7731e36b514d1beca19e777a2d653
  4. Affected versionversion=d370cec3219490656d72f5ae6e5df32c113c5a44 <429348d4f675e9eb418d0829064c4d7d06bd66a3
  5. Affected versionversion=d370cec3219490656d72f5ae6e5df32c113c5a44 <c4c9d9edf4848aed89516b23b88950b194beff6a
  6. Affected versionversion=d370cec3219490656d72f5ae6e5df32c113c5a44 <cf5bb835b7c8a5fee7f26455099cca7feb57f5e9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=d370cec3219490656d72f5ae6e5df32c113c5a44 <1f1ab76e251521bd2fa5244473efcf663792745d; version=d370cec3219490656d72f5ae6e5df32c113c5a44 <426d5bc089e7731e36b514d1beca19e777a2d653; version=d370cec3219490656d72f5ae6e5df32c113c5a44 <429348d4f675e9eb418d0829064c4d7d06bd66a3; version=d370cec3219490656d72f5ae6e5df32c113c5a44 <c4c9d9edf4848aed89516b23b88950b194beff6a; version=d370cec3219490656d72f5ae6e5df32c113c5a44 <cf5bb835b7c8a5fee7f26455099cca7feb57f5e9

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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