CVE-2024-27066

DMA mapping leak via skipped indirect-table unmapping

Published May 1, 2024 · Updated Aug 5, 2026

Resource-management error in Linux kernel 6.6 through 6.8.1 leaves DMA mappings allocated when packed virtio buffers are detached. In detach_buf_packed, a false do_unmap value skips vring_unmap_extra_packed for an indirect descriptor table even though use_dma_api requires release. The path requires use_dma_api and premapped with indirect descriptors; upstream states that no driver uses that combination, so current drivers do not reach the leak.

CVSS severity5.5
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-management error in Linux kernel 6.6 through 6.8.1 leaves DMA mappings allocated when packed virtio buffers are detached. In detach_buf_packed, a false do_unmap value skips vring_unmap_extra_packed for an indirect descriptor table even though use_dma_api requires release. The path requires use_dma_api and premapped with indirect descriptors; upstream states that no driver uses that combination, so current drivers do not reach the leak.

The record

CVE
CVE-2024-27066
Published
May 1, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.6
  2. Affected versionversion=b319940f83c21bb4c1fabffe68a862be879a6193 <51bacd9d29bf98c3ebc65e4a0477bb86306b4140
  3. Affected versionversion=b319940f83c21bb4c1fabffe68a862be879a6193 <75450ff8c6fe8755bf5b139b238eaf9739cfd64e
  4. Affected versionversion=b319940f83c21bb4c1fabffe68a862be879a6193 <d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd
  5. Affected versionversion=b319940f83c21bb4c1fabffe68a862be879a6193 <e142169aca5546ae6619c39a575cda8105362100

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=b319940f83c21bb4c1fabffe68a862be879a6193 <51bacd9d29bf98c3ebc65e4a0477bb86306b4140; version=b319940f83c21bb4c1fabffe68a862be879a6193 <75450ff8c6fe8755bf5b139b238eaf9739cfd64e; version=b319940f83c21bb4c1fabffe68a862be879a6193 <d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd; version=b319940f83c21bb4c1fabffe68a862be879a6193 <e142169aca5546ae6619c39a575cda8105362100

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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

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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-401Missing Release of Memory after Effective Lifetime

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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