CVE-2026-46311 - Vulnerability Details

- drm/amdgpu/userq: fix access to stale wptr mapping

Description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu/userq: fix access to stale wptr mapping

Use drm_exec to take both locks i.e vm root bo and
wptr_obj bo to access the mapping data properly.

This fixes the security issue of unmap the wptr_obj while
a queue creation is in progress and passing other
bo at same address.

(cherry picked from commit 1fc6c8ab45dbee096469c08c13f6099d57a52d6c)

Published: 2026-06-08

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The issue is a race condition in the Linux kernel’s AMDGPU DRM subsystem where a write‑pointer object (wptr_obj) can be unmapped while a new command queue is being created, allowing a different buffer object to be mapped to the same address. This improper synchronization of mapping data can corrupt kernel memory and potentially enable an attacker to influence kernel structures.

Affected Systems

All Linux kernel builds that do not contain the commit that introduces the lock ordering fix are affected, including the generic kernel and the 7.1 release candidate kernels (rc1 and rc2). Systems with the AMDGPU driver enabled and those that do not apply the patch are vulnerable.

Risk and Exploitability

The CVSS score of 7.8 indicates a moderate-to‑high severity. The EPSS score of less than 1% suggests a low probability of widespread exploitation, and the vulnerability is not listed in the CISA KEV catalog. The description does not specify a remote attack vector; the race condition likely requires a local program to interact with the AMDGPU driver to trigger the corruption.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`5fb2f7fc21a3668e5794cc0d153641b9719713e1`	affected	< 2da62dbb4169e758c0b1a9378b39a373bf4fb111
`5fb2f7fc21a3668e5794cc0d153641b9719713e1`	affected	< 336a9186f3a4b65bbd865d93936605ac8a1a3991
`5fb2f7fc21a3668e5794cc0d153641b9719713e1`	affected	< 6da7b1242da4455b11c24ce667d1cab1a348c8ea

Linux

affected

Version	Status	Constraints
`6.16`	affected	—
`0`	unaffected	< 6.16
`6.18.57`	unaffected	≤ 6.18.*
`7.0.9`	unaffected	≤ 7.0.*
`7.1`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:7.1:rc1::::::
	cpe:2.3:o:linux:linux_kernel:7.1:rc2::::::

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,336a9186f3a4b65bbd865d93936605ac8a1a3991)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6da7b1242da4455b11c24ce667d1cab1a348c8ea)`	affected	code_commit	—
`[0,7.0.9)`	affected	generic	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[7.0.9,7.1.0)`	unaffected	semver	—
`[7.1-rc3,*]`	unaffected	generic	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the Linux kernel to a version that includes the commit fixing the stale wptr mapping race.
Rebuild the kernel with the corrected source code or apply the upstream patch if an official update is not available.
If GPU functionality is not required, unload or disable the AMDGPU driver to remove the attack surface.

Generated by OpenCVE AI on October 23, 2026 at 01:56 UTC.

Tracking

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Advisories

Source	ID	Title
Ubuntu USN	USN-8566-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8568-1	Linux kernel (OEM) vulnerabilities
Ubuntu USN	USN-8569-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-8593-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8603-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8618-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8663-1	Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN	USN-8664-1	Linux kernel (NVIDIA BaseOS) vulnerabilities
Ubuntu USN	USN-8728-1	Linux kernel (GCP) vulnerabilities
Ubuntu USN	USN-8728-2	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8728-3	Linux kernel (Oracle) vulnerabilities

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00095.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://git.kernel.org/stable/c/2da62dbb4169e758c0b1a9378b39a373bf4fb111
https://git.kernel.org/stable/c/336a9186f3a4b65bbd865d93936605ac8a1a3991
https://git.kernel.org/stable/c/6da7b1242da4455b11c24ce667d1cab1a348c8ea
https://lore.kernel.org/linux-cve-announce/2026060853-CVE-2026-46311-bf08@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-46311
https://www.cve.org/CVERecord?id=CVE-2026-46311

History

Mon, 19 Oct 2026 20:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-362

Sat, 17 Oct 2026 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Thu, 15 Oct 2026 13:30:00 +0000

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/2da62dbb4169e758c0b1a9378b39a373bf4fb111

Sun, 14 Jun 2026 05:45:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Tue, 09 Jun 2026 00:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-825
References		https://lore.kernel.org/linux-cve-announce/2026060853-CVE-2026-46311-bf08@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-46311 https://www.cve.org/CVERecord?id=CVE-2026-46311

Mon, 08 Jun 2026 17:00:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/userq: fix access to stale wptr mapping Use drm_exec to take both locks i.e vm root bo and wptr_obj bo to access the mapping data properly. This fixes the security issue of unmap the wptr_obj while a queue creation is in progress and passing other bo at same address. (cherry picked from commit 1fc6c8ab45dbee096469c08c13f6099d57a52d6c)
Title		drm/amdgpu/userq: fix access to stale wptr mapping
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/336a9186f3a4b65bbd865d93936605ac8a1a3991 https://git.kernel.org/stable/c/6da7b1242da4455b11c24ce667d1cab1a348c8ea

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-06-08T15:50:41.866Z

Updated: 2026-10-19T19:36:57.524Z

Reserved: 2026-05-13T15:03:33.111Z

Link: CVE-2026-46311

Vulnrichment

Updated: 2026-10-16T15:21:51.503Z

NVD

Status : Modified

Published: 2026-06-08T17:16:50.053

Modified: 2026-10-19T20:18:41.920

Link: CVE-2026-46311

Redhat

Severity :

Publid Date: 2026-06-08T00:00:00Z

Links: CVE-2026-46311 - Bugzilla

OpenCVE Enrichment

Updated: 2026-10-23T02:00:16Z

Weaknesses

CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-825
Expired Pointer Dereference
NVD-CWE-noinfo

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact total

Subscriptions

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