CVE-2022-48730

Kernel-memory disclosure via speculative DMA-heap indexing

Published Jun 20, 2024 · Updated May 11, 2026

Spectre v1 in the Linux kernel DMA-heap subsystem allows local users to read kernel memory through a crafted allocation request. In dma_heap_ioctl, the user-controlled nr value passes an architectural bounds check yet can transiently index dma_heap_ioctl_cmds out of bounds. Exploitation requires low-privileged local access to submit the ioctl; the documented consequence is confidentiality loss without integrity or availability impact.

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

Spectre v1 in the Linux kernel DMA-heap subsystem allows local users to read kernel memory through a crafted allocation request. In dma_heap_ioctl, the user-controlled nr value passes an architectural bounds check yet can transiently index dma_heap_ioctl_cmds out of bounds. Exploitation requires low-privileged local access to submit the ioctl; the documented consequence is confidentiality loss without integrity or availability impact.

The record

CVE
CVE-2022-48730
Published
Jun 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 2024CVE 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=5.6
  2. Affected versionversion=c02a81fba74fe3488ad6b08bfb5a1329005418f8 <24f8e12d965b24f8aea762589e0e9fe2025c005e
  3. Affected versionversion=c02a81fba74fe3488ad6b08bfb5a1329005418f8 <5d40f1bdad3dd1a177f21a90ad4353c1ed40ba3a
  4. Affected versionversion=c02a81fba74fe3488ad6b08bfb5a1329005418f8 <92c4cfaee6872038563c5b6f2e8e613f9d84d47d
  5. Affected versionversion=c02a81fba74fe3488ad6b08bfb5a1329005418f8 <cc8f7940d9c2d45f67b3d1a2f2b7a829ca561bed

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=c02a81fba74fe3488ad6b08bfb5a1329005418f8 <24f8e12d965b24f8aea762589e0e9fe2025c005e; version=c02a81fba74fe3488ad6b08bfb5a1329005418f8 <5d40f1bdad3dd1a177f21a90ad4353c1ed40ba3a; version=c02a81fba74fe3488ad6b08bfb5a1329005418f8 <92c4cfaee6872038563c5b6f2e8e613f9d84d47d; version=c02a81fba74fe3488ad6b08bfb5a1329005418f8 <cc8f7940d9c2d45f67b3d1a2f2b7a829ca561bed

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 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

CWE-203Observable Discrepancy

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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