CVE-2026-80633Hinoki check available

Kernel warning via unlocked DMA-BUF unpin

Published Aug 28, 2026 · Updated Aug 28, 2026

Incorrect locking in Linux 7.1 allows local users to trigger a kernel warning by releasing DMABUF-backed iommufd pages. iopt_release_pages() calls dma_buf_unpin() without holding the exporter's dma_resv lock, violating the unpin API's locking requirement. The path requires access to a DMABUF-backed iommufd IOAS whose last page reference is released during destroy or unmap; only a WARN is documented.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect locking in Linux 7.1 allows local users to trigger a kernel warning by releasing DMABUF-backed iommufd pages. iopt_release_pages() calls dma_buf_unpin() without holding the exporter's dma_resv lock, violating the unpin API's locking requirement. The path requires access to a DMABUF-backed iommufd IOAS whose last page reference is released during destroy or unmap; only a WARN is documented.

The record

CVE
CVE-2026-80633
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=7.1
  2. Affected versionversion=8c5f9645c3893f0db679d9affe4fe4e665b990dd <cc69d0332421fd2943b66dbe5e597bf4fd5af126
  3. Affected versionversion=8c5f9645c3893f0db679d9affe4fe4e665b990dd <e745cd2c749e557c14a15ac931761c3f58c24489

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=8c5f9645c3893f0db679d9affe4fe4e665b990dd <cc69d0332421fd2943b66dbe5e597bf4fd5af126; version=8c5f9645c3893f0db679d9affe4fe4e665b990dd <e745cd2c749e557c14a15ac931761c3f58c24489

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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