CVE-2022-49983

Local availability loss via unset DMA mask

Published Jun 18, 2025 · Updated Aug 15, 2026

Improper DMA handling in the Linux kernel allows local users to trigger a kernel warning through udmabuf CPU access. The udmabuf creation path leaves its miscellaneous device without an explicit DMA mask, so get_sg_table maps a scatter-gather table against an unset mask. Low-privileged access to the local ioctl path is required; the record reports availability loss but does not identify a hang, crash, or reboot outcome.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper DMA handling in the Linux kernel allows local users to trigger a kernel warning through udmabuf CPU access. The udmabuf creation path leaves its miscellaneous device without an explicit DMA mask, so get_sg_table maps a scatter-gather table against an unset mask. Low-privileged access to the local ioctl path is required; the record reports availability loss but does not identify a hang, crash, or reboot outcome.

The record

CVE
CVE-2022-49983
Published
Jun 18, 2025
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=284562e1f34874e267d4f499362c3816f8f6bc3f <872875c9ecf8fa2e1d82bb2f2f1963f571aa8959
  2. Affected versionversion=284562e1f34874e267d4f499362c3816f8f6bc3f <9e9fa6a9198b767b00f48160800128e83a038f9f
  3. Affected versionversion=284562e1f34874e267d4f499362c3816f8f6bc3f <e658538c610c6047b3c9f552e73801894d9284b1
  4. Affected versionversion=284562e1f34874e267d4f499362c3816f8f6bc3f <f2f6ea1a8da1317430a84701fc0170449ee88315
  5. Affected versionversion=5.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=284562e1f34874e267d4f499362c3816f8f6bc3f <872875c9ecf8fa2e1d82bb2f2f1963f571aa8959; version=284562e1f34874e267d4f499362c3816f8f6bc3f <9e9fa6a9198b767b00f48160800128e83a038f9f; version=284562e1f34874e267d4f499362c3816f8f6bc3f <e658538c610c6047b3c9f552e73801894d9284b1; version=284562e1f34874e267d4f499362c3816f8f6bc3f <f2f6ea1a8da1317430a84701fc0170449ee88315; version=5.6

Published CVSS scores

5.5NVDCVSS: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.

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Technologies

Your stack

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Your stack

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