🛡️ CVE-2026-46309 — kernel

🟠 CVSS 7.0 — High ✅ No Known Exploit NVD
7.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise

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)

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-46309 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 7.0.9)
  • linux-kernel
  • unknown

Timeline and source

Published on 8 June 2026 and last revised on 25 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
security.access.redhat.com (Web)
access.redhat.com (Advisory)
github.com (Advisory)
nvd.nist.gov (Advisory)
bugzilla.redhat.com (Report)
git.kernel.org (Package)

CVE-2026-46309 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.0
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-06-08
Updated 2026-08-12
Modified 2026-07-25

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.9
linux-kernel — —
unknown — —

Similar Threats

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