CVE-2022-49753

Use-after-free via double-counted DMA channel references

Published Mar 27, 2025 · Updated May 11, 2026

Use-after-free in affected Linux kernel dmaengine branches from 4.0 allows local users to corrupt DMA channel resource accounting. dma_chan_get() increments client_count once in balance_ref_count() and again before returning for a public channel, so later releases fail to free resources at the correct time. Repeated async_tx module load and unload produced retained channel references, a kref underflow, and a use-after-free warning; module lifecycle access is required.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected Linux kernel dmaengine branches from 4.0 allows local users to corrupt DMA channel resource accounting. dma_chan_get() increments client_count once in balance_ref_count() and again before returning for a public channel, so later releases fail to free resources at the correct time. Repeated async_tx module load and unload produced retained channel references, a kref underflow, and a use-after-free warning; module lifecycle access is required.

The record

CVE
CVE-2022-49753
Published
Mar 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 27, 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=4.0
  2. Affected versionversion=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <142d644fd2cc059ffa042fbfb68e766433ef3afd
  3. Affected versionversion=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <18dd3b30d4c7e8440c63118c7a7b687372b9567f
  4. Affected versionversion=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <1b409e14b4b7af034e0450f95c165b6c5c87dbc1
  5. Affected versionversion=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <42ecd72f02cd657b00b559621e7ef7d2c4d3e5f1
  6. Affected versionversion=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <71c601965532c38030133535f7cd93c1efa75af1
  7. Affected versionversion=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <c6221afe573413fd2981e291f7df4a58283e0654
  8. Affected versionversion=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <f3dc1b3b4750851a94212dba249703dd0e50bb20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.0; version=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <142d644fd2cc059ffa042fbfb68e766433ef3afd; version=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <18dd3b30d4c7e8440c63118c7a7b687372b9567f; version=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <1b409e14b4b7af034e0450f95c165b6c5c87dbc1; version=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <42ecd72f02cd657b00b559621e7ef7d2c4d3e5f1; version=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <71c601965532c38030133535f7cd93c1efa75af1; version=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <c6221afe573413fd2981e291f7df4a58283e0654; version=d2f4f99db3e9ec8b063cf2e45704e2bb95428317 <f3dc1b3b4750851a94212dba249703dd0e50bb20

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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