CVE-2022-49522

Local availability loss via oversized DMA segments

Published Feb 26, 2025 · Updated May 11, 2026

Improper DMA segment sizing in the Linux kernel allows local users to disrupt availability through jz4740 MMC block I/O. The jz4740_mmc driver permits scatter-gather segments larger than the DMA engine's advertised maximum, causing an invalid DMA mapping. Reachability requires an Ingenic JZ4740-family MMC host using DMA; the published trace demonstrates a kernel warning, while the terminal failure mode is undisclosed.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper DMA segment sizing in the Linux kernel allows local users to disrupt availability through jz4740 MMC block I/O. The jz4740_mmc driver permits scatter-gather segments larger than the DMA engine's advertised maximum, causing an invalid DMA mapping. Reachability requires an Ingenic JZ4740-family MMC host using DMA; the published trace demonstrates a kernel warning, while the terminal failure mode is undisclosed.

The record

CVE
CVE-2022-49522
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.18
  2. Affected versionversion=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <353298cadbd4c7d8e8a16d6000066414694933c3
  3. Affected versionversion=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <7923f95997a79cef2ad161a2facae64c25a0bca0
  4. Affected versionversion=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <807f90f1960a59dc557542b818c484a8db9ac978
  5. Affected versionversion=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <90281cadf5077f2d2bec8b08c2ead1f8cd12660e
  6. Affected versionversion=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <a828920b9ec0d89d3011198d482b7fe224d2de19
  7. Affected versionversion=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <afadb04f1d6e74b18a253403f5274cde5e3fd7bd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <353298cadbd4c7d8e8a16d6000066414694933c3; version=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <7923f95997a79cef2ad161a2facae64c25a0bca0; version=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <807f90f1960a59dc557542b818c484a8db9ac978; version=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <90281cadf5077f2d2bec8b08c2ead1f8cd12660e; version=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <a828920b9ec0d89d3011198d482b7fe224d2de19; version=7ca27a6f80a4042666a28977ff8ee3aa527c6cd4 <afadb04f1d6e74b18a253403f5274cde5e3fd7bd

Published CVSS scores

5.5Canonical UbuntuCVSS: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

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

T1499Endpoint Denial of Service

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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