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Linux Kernel CVE-2026-45956

| EUVDEUVD-2026-32240 HIGH
Use After Free (CWE-416)
2026-05-27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-pwfh-32f2-c83x
Denial Of Service Samsung Linux Use After Free Memory Corruption
7.8
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
6.7 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 05, 2026 - 07:23 vuln.today
CVSS changed
Jun 05, 2026 - 07:22 NVD
7.8 (HIGH)
Patch available
May 27, 2026 - 19:46 EUVD
CVE Published
May 27, 2026 - 14:17 nvd
UNKNOWN (no severity yet)
CVE Published
May 27, 2026 - 14:17 nvd
HIGH 7.8

DescriptionCVE.org

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

drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()

vidi_connection_ioctl() retrieves the driver_data from drm_dev->dev to obtain a struct vidi_context pointer. However, drm_dev->dev is the exynos-drm master device, and the driver_data contained therein is not the vidi component device, but a completely different device.

This can lead to various bugs, ranging from null pointer dereferences and garbage value accesses to, in unlucky cases, out-of-bounds errors, use-after-free errors, and more.

To resolve this issue, we need to store/delete the vidi device pointer in exynos_drm_private->vidi_dev during bind/unbind, and then read this exynos_drm_private->vidi_dev within ioctl() to obtain the correct struct vidi_context pointer.

AnalysisAI

Local privilege escalation and memory corruption in the Linux kernel's Exynos DRM VIDI (Virtual Display) driver allows local users with access to the DRM device to trigger null pointer dereferences, garbage value accesses, out-of-bounds reads, or use-after-free conditions via the vidi_connection_ioctl() handler. The flaw stems from an incorrect device-to-context lookup that retrieves driver_data from the exynos-drm master device instead of the VIDI component device. A vendor patch is available across multiple stable branches, no public exploit identified at time of analysis, and EPSS rates exploitation probability at only 0.02%.

Technical ContextAI

The vulnerability resides in drivers/gpu/drm/exynos/exynos_drm_vidi.c, part of the Direct Rendering Manager (DRM) subsystem supporting Samsung Exynos SoCs. The Exynos DRM stack uses a component framework where a 'master' device aggregates several sub-component devices (VIDI being the virtual display output). In vidi_connection_ioctl(), the handler called dev_get_drvdata() on drm_dev->dev - which points to the exynos-drm master device - and then cast that pointer to a struct vidi_context. Because the master device's driver_data belongs to a different driver entirely, the resulting pointer is type-confused. Depending on what that other driver stored there, subsequent dereferences range from NULL crashes to reads of attacker-irrelevant kernel memory to out-of-bounds and use-after-free conditions. The fix stores the actual VIDI device pointer in exynos_drm_private->vidi_dev during bind/unbind so the ioctl path can resolve the correct context. While no CWE was assigned, this is a classic type-confusion / incorrect-pointer-lookup bug (CWE-843 family) leading to memory-safety violations.

RemediationAI

Vendor-released patches are available: upgrade to Linux 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.18.14, or 6.19.4 (or later) on the corresponding stable branch, or pick up the stable-tree commits listed at https://git.kernel.org/stable/c/21ca24ba51a2c28bcc4df9d7e5a40b0eb66ab76d and its siblings. Distribution users should track their vendor's CVE-2026-45956 advisory and apply the next kernel update; for downstream Android/Tizen vendor kernels that lag mainline, request a backport of the seven listed stable commits. As a compensating control where patching is delayed, restrict access to /dev/dri/* nodes by tightening udev rules or seat/group membership so only trusted local users (typically the active graphical session) can issue DRM ioctls - note this breaks unprivileged use of GPU/display features and is unsuitable on multi-user systems that rely on accelerated graphics. Disabling or not loading the exynos_drm module (CONFIG_DRM_EXYNOS=n, or blacklisting on systems that do not require Exynos display output) fully removes the attack surface but disables hardware display on affected SoCs and is therefore only viable on systems that do not need the Exynos display pipeline.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected

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CVE-2026-45956 vulnerability details – vuln.today
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