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Linux Kernel CVE-2026-46309

| EUVDEUVD-2026-35119 HIGH
Use of Cache Containing Sensitive Information (CWE-524)
2026-06-08 Linux GHSA-vpjp-gfpq-57c9
Information Disclosure Linux Red Hat Suse
7.0
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.0 HIGH
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
4.7 MEDIUM

Local ioctl access with low privileges (PR:L), a timing race against page-clearing makes it AC:H, and CWE-524 is pure disclosure so C:H with I:N/A:N.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Red Hat
7.0 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 30, 2026 - 05:27 vuln.today
CVSS changed
Jun 30, 2026 - 03:24 NVD
7.0 (HIGH)
Patch available
Jun 08, 2026 - 18:01 EUVD
CVE Published
Jun 08, 2026 - 15:50 cve.org
HIGH 7.0
CVE Published
Jun 08, 2026 - 15:50 nvd
UNKNOWN (no severity yet)

DescriptionNVD

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)

AnalysisAI

Information disclosure in the Linux kernel's Intel Xe DRM graphics driver (drm/xe) allows a local user to read stale data from previously freed memory pages belonging to other processes. The xe_vm_madvise_ioctl() handler failed to reject PAT indices set to XE_COH_NONE (non-coherent) coherency mode on CPU-cached buffer objects, letting a GPU bypass dirty CPU caches and read sensitive content directly from DRAM before the kernel's page-clearing writeback completes. There is no public exploit identified at time of analysis, and EPSS rates exploitation probability at just 0.02%, consistent with a local, race-dependent leak rather than a widely weaponized flaw.

Technical ContextAI

The vulnerability lives in the Intel Xe kernel-mode DRM driver, which manages modern Intel integrated and discrete GPUs and exposes a uAPI for userspace graphics/compute clients. PAT (Page Attribute Table) indices control GPU memory coherency; the XE_COH_NONE mode tells the GPU it need not snoop CPU caches. When the kernel zeroes freed pages before reallocation, those writes can remain dirty in the CPU cache and not yet be flushed to DRAM. A GPU mapping configured with coh_none bypasses that cache and reads directly from DRAM, observing the stale, uncleared contents of pages previously owned by other processes. The root cause maps to CWE-524 (Use of Cache Containing Sensitive Information): the madvise path lacked the coherency validation already present in the vm_bind path (xe_vm_bind_ioctl_validate_bo), creating an inconsistent enforcement gap. Per the v9 revision note, the final fix limits the restriction to integrated GPUs (iGPU). CPE data identifies the affected product as cpe:2.3:a:linux:linux, i.e., the Linux kernel itself.

RemediationAI

Vendor-released patch: update to a fixed Linux stable kernel - 6.18.32, 7.0.9, or 7.1-rc2 (or later) - which adds the missing coh_none/CPU-cached validation to xe_vm_madvise_ioctl(). The fix is delivered as upstream stable commits available at https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00, https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424, and https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39; for enterprise distributions, apply the corresponding vendor kernel update tracked at https://access.redhat.com/security/cve/CVE-2026-46309. If immediate patching is not possible, compensating controls include restricting access to the GPU render/DRI device nodes (e.g., tightening /dev/dri permissions and group membership) so only trusted users can issue the madvise ioctl, which limits the local attacker pool at the cost of breaking GPU access for unprivileged graphics/compute workloads. On affected systems where the Xe iGPU driver is not required, blacklisting or unloading the xe module removes the attack surface entirely but disables hardware acceleration for that GPU.

Same weakness CWE-524 – Use of Cache Containing Sensitive Information

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected

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CVE-2026-46309 vulnerability details – vuln.today
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