CVE-2026-64590

Spurious kernel warning via redundant DMA synchronization

Published Aug 6, 2026 · Updated Aug 6, 2026

Improper DMA synchronization in the Linux udmabuf driver allows local users to trigger a spurious warning through a DRM import. map_udmabuf passes zero attributes to dma_map_sgtable after begin_cpu_udmabuf has mapped the same per-page scatter-gather list, so DMA debug flags harmless overlapping cachelines. Reachability requires CONFIG_DMA_API_DEBUG_SG, an active udmabuf CPU mapping, and a second-device importer such as amdgpu; the reported consequence is a warning, not data corruption or service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper DMA synchronization in the Linux udmabuf driver allows local users to trigger a spurious warning through a DRM import. map_udmabuf passes zero attributes to dma_map_sgtable after begin_cpu_udmabuf has mapped the same per-page scatter-gather list, so DMA debug flags harmless overlapping cachelines. Reachability requires CONFIG_DMA_API_DEBUG_SG, an active udmabuf CPU mapping, and a second-device importer such as amdgpu; the reported consequence is a warning, not data corruption or service interruption.

The record

CVE
CVE-2026-64590
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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 <0449a6583c0ee76778d314e4e82f166fc97fa9d8
  2. Affected versionversion=284562e1f34874e267d4f499362c3816f8f6bc3f <0db56e7eae932f8e2f3eb44ad1a63633d8f504f8
  3. Affected versionversion=284562e1f34874e267d4f499362c3816f8f6bc3f <34696563461c9a23177feb6d8aff43f4c0510278
  4. Affected versionversion=284562e1f34874e267d4f499362c3816f8f6bc3f <504e2b4ab97a51d56d966cd36d0997ad30b65b2d
  5. Affected versionversion=284562e1f34874e267d4f499362c3816f8f6bc3f <d6552f5cff795d60e629f37513ecf23d88fd2f82
  6. Affected versionversion=5.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=284562e1f34874e267d4f499362c3816f8f6bc3f <0449a6583c0ee76778d314e4e82f166fc97fa9d8; version=284562e1f34874e267d4f499362c3816f8f6bc3f <0db56e7eae932f8e2f3eb44ad1a63633d8f504f8; version=284562e1f34874e267d4f499362c3816f8f6bc3f <34696563461c9a23177feb6d8aff43f4c0510278; version=284562e1f34874e267d4f499362c3816f8f6bc3f <504e2b4ab97a51d56d966cd36d0997ad30b65b2d; version=284562e1f34874e267d4f499362c3816f8f6bc3f <d6552f5cff795d60e629f37513ecf23d88fd2f82; version=5.6

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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