CVE-2026-46309

Description

In the Linux kernel, the following vulnerability has been resolved: drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise Add validation in xe_vm_madvise_ioctl() to reject PAT indices with XE_COH_NONE coherency mode when applied to CPU cached memory. Using coh_none with CPU cached buffers is a security issue. When the kernel clears pages before reallocation, the clear operation stays in CPU cache (dirty). GPU with coh_none can bypass CPU caches and read stale sensitive data directly from DRAM, potentially leaking data from previously freed pages of other processes. This aligns with the existing validation in vm_bind path (xe_vm_bind_ioctl_validate_bo). v2(Matthew brost) - Add fixes - Move one debug print to better place v3(Matthew Auld) - Should be drm/xe/uapi - More Cc v4(Shuicheng Lin) - Fix kmem leak issues by the way v5 - Remove kmem leak because it has been merged by another patch v6 - Remove the fix which is not related to current fix v7 - No change v8 - Rebase v9 - Limit the restrictions to iGPU v10 - No change (cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2026-46309 on 2026-08-01. Shown when MITRE's text differs from the cvelistV5 mirror.

In the Linux kernel, the following vulnerability has been resolved: drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise Add validation in xe_vm_madvise_ioctl() to reject PAT indices with XE_COH_NONE coherency mode when applied to CPU cached memory. Using coh_none with CPU cached buffers is a security issue. When the kernel clears pages before reallocation, the clear operation stays in CPU cache (dirty). GPU with coh_none can bypass CPU caches and read stale sensitive data directly from DRAM, potentially leaking data from previously freed pages of other processes. This aligns with the existing validation in vm_bind path (xe_vm_bind_ioctl_validate_bo). v2(Matthew brost) - Add fixes - Move one debug print to better place v3(Matthew Auld) - Should be drm/xe/uapi - More Cc v4(Shuicheng Lin) - Fix kmem leak issues by the way v5 - Remove kmem leak because it has been merged by another patch v6 - Remove the fix which is not related to current fix v7 - No change v8 - Rebase v9 - Limit the restrictions to iGPU v10 - No change (cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)

Overview

State

—

Assigner (CNA)

—

CVSS severity

high

CVSS score

7.1 / 10

CVSS vector

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

Effective score

7.1 / 10 HIGH source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2026-46309

Linked Threat

CVE-2026-46309 — CVE-2026-46309

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2026-06-08 17:16:49 UTC

NVD last modified

2026-07-23 08:10:00 UTC

NVD CVSS v3.1

7.0 / 10 HIGH source: nvd@nist.gov

NVD CVSS vector

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

Exploitability subscore

1.0 / 10

Impact subscore

5.9 / 10

EPSS score

0.0013 (probability of exploitation in next 30 days)

EPSS percentile

2.60% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01

NVD-assigned CWE(s): CWE-401, CWE-524 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2026-35119

Assigner

Linux

Published

Jun 8, 2026, 3:50:39 PM

Updated

Jul 15, 2026, 12:50:51 AM

EUVD base score (CVSS 3.1)

7.0 / 10
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EUVD-reported EPSS

0.1300

Vendors

Linux

Products

Linux (patch: 7.0.9)

Linux (ada7486c5668db542a7d361268df931aca5b726a <fea04cf6f2345bc50f15b6638906c35962b89424)

Linux (patch: 0)

Linux (6.18)

Linux (ada7486c5668db542a7d361268df931aca5b726a <4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39)

Linux (patch: 6.18.32)

Linux (patch: 7.1)

Linux (ada7486c5668db542a7d361268df931aca5b726a <87f9b1528e1ffc1da3615d552c9a06aba5e20b00)

Aliases

GHSA-vpjp-gfpq-57c9

ENISA description: In the Linux kernel, the following vulnerability has been resolved: drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise Add validation in xe_vm_madvise_ioctl() to reject PAT indices with XE_COH_NONE coherency mode when applied to CPU cached memory. Using coh_none with CPU cached buffers is a security issue. When the kernel clears pages before reallocation, the clear operation stays in CPU cache (dirty). GPU with coh_none can bypass CPU caches and read stale sensitive data directly from DRAM, potentially leaking data from previously freed pages of other processes. This aligns with the existing validation in vm_bind path (xe_vm_bind_ioctl_validate_bo). v2(Matthew brost) - Add fixes - Move one debug print to better place v3(Matthew Auld) - Should be drm/xe/uapi - More Cc v4(Shuicheng Lin) - Fix kmem leak issues by the way v5 - Remove kmem leak because it has been merged by another patch v6 - Remove the fix which is not related to current fix v7 - No change v8 - Rebase v9 - Limit the restrictions to iGPU v10 - No change (cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (5)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39 tenable:git.kernel.org
• https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00 tenable:git.kernel.org
• https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424 tenable:git.kernel.org
• https://nvd.nist.gov/vuln/detail/CVE-2026-46309 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2026-46309 tenable:www.cve.org

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

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• UBUNTU-CVE-2026-46309 | Mondoo Vulnerability Intelligence
  web:mondoo.com

  UBUNTU- CVE - 2026 - 46309 - HIGH severity: In the Linux kernel, the following vulnerability has been resolved: drm/xe/uapi: Reject coh_none PAT index for CPU cac...

  2026-06-19 02:38 UTC
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  web:www.oracle.com

  This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

  2026-06-19 02:38 UTC
• Oracle Critical Security Patch Update Advisory - May 2026
  web:www.oracle.com

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  2026-06-19 02:38 UTC
• Patch Tuesday June 2026: Security Updates & CVE Analysis
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