CVE-2026-68271

Kernel oops via reversed ucopy cleanup

Published Aug 10, 2026 · Updated Aug 10, 2026

Denial of service in the Linux kernel allows local users to trigger a kernel oops through Nouveau DRM operations. The nouveau_uvmm_vm_bind_ucopy() and nouveau_exec_ucopy() error paths free resources in allocation order, causing kvfree() to dereference an ERR_PTR after an input-copy failure or leaking an earlier allocation after an output-copy failure. Reachability requires local access to the Nouveau DRM user API and a copy failure; the bounded consequence is a kernel oops or memory leak.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel allows local users to trigger a kernel oops through Nouveau DRM operations. The nouveau_uvmm_vm_bind_ucopy() and nouveau_exec_ucopy() error paths free resources in allocation order, causing kvfree() to dereference an ERR_PTR after an input-copy failure or leaking an earlier allocation after an output-copy failure. Reachability requires local access to the Nouveau DRM user API and a copy failure; the bounded consequence is a kernel oops or memory leak.

The record

CVE
CVE-2026-68271
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=b88baab828713ce0b49b185444b2ee83bed373a8 <2473ac314387a5def7244eb6d6a345934ed140bf
  3. Affected versionversion=b88baab828713ce0b49b185444b2ee83bed373a8 <4e109faa9ea2b6c04cc5a99e76db3126575a59d1
  4. Affected versionversion=b88baab828713ce0b49b185444b2ee83bed373a8 <ab99ead646b1b833ecd57fe577a2816f2e848167
  5. Affected versionversion=b88baab828713ce0b49b185444b2ee83bed373a8 <e15c25c7972d38a9f6bf8c3f7f29179a67263eba
  6. Affected versionversion=b88baab828713ce0b49b185444b2ee83bed373a8 <ebbaf64d2635d1e78196c067fa8fa582a7dc17f7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=b88baab828713ce0b49b185444b2ee83bed373a8 <2473ac314387a5def7244eb6d6a345934ed140bf; version=b88baab828713ce0b49b185444b2ee83bed373a8 <4e109faa9ea2b6c04cc5a99e76db3126575a59d1; version=b88baab828713ce0b49b185444b2ee83bed373a8 <ab99ead646b1b833ecd57fe577a2816f2e848167; version=b88baab828713ce0b49b185444b2ee83bed373a8 <e15c25c7972d38a9f6bf8c3f7f29179a67263eba; version=b88baab828713ce0b49b185444b2ee83bed373a8 <ebbaf64d2635d1e78196c067fa8fa582a7dc17f7

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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