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Linux Kernel CVE-2026-53137

| EUVDEUVD-2026-39342 HIGH
Out-of-bounds Write (CWE-787)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-36gr-gw56-g35v
Memory Corruption Linux Amd Buffer Overflow Red Hat Suse
7.8
CVSS 3.1 · NVD
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Severity by source

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

Attack requires attacker-controlled HDMI repeater hardware, so AV:P (physical) not AV:L; no OS credentials needed (PR:N); kernel heap overwrite yields full C/I/A impact.

3.1 AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
6.8 MEDIUM
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD.

CVSS VectorNVD

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
Jul 07, 2026 - 16:53 vuln.today
CVSS changed
Jul 07, 2026 - 16:52 NVD
7.8 (HIGH)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 25, 2026 - 09:16 nvd
HIGH 7.8

DescriptionNVD

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

drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size

[Why & How] During HDCP 2.x repeater authentication over HDMI, the driver reads the sink's RxStatus register and extracts a 10-bit message size field (max value 1023). This value is used as the read length for the ReceiverID list without being clamped to the size of the destination buffer rx_id_list[177]. A malicious HDMI repeater could advertise a message size larger than the buffer, causing an out-of-bounds write during the I2C read.

Clamp the read length in mod_hdcp_read_rx_id_list() to the size of the rx_id_list buffer, matching the approach already used in the DP branch.

(cherry picked from commit 229212219e4247d9486f8ba41ef087358490be09)

AnalysisAI

Out-of-bounds kernel heap write in the AMD Display (amdgpu) driver's HDMI HDCP 2.x repeater authentication path affects Linux kernels from 5.6 through the 7.1 release candidates. When reading a downstream sink's RxStatus register, the driver in mod_hdcp_read_rx_id_list() uses an attacker-influenced 10-bit message-size field (up to 1023 bytes) as the I2C read length without bounding it to the 177-byte rx_id_list buffer, so a malicious HDMI repeater can force a write past the buffer and corrupt kernel memory. There is no public exploit identified at time of analysis and EPSS is low (0.21%, 11th percentile); it is not listed in CISA KEV.

Technical ContextAI

The flaw lives in the AMD Display Core's Media Object Driver (MOD) HDCP module, which implements HDCP 2.x content-protection over HDMI. During repeater authentication the transmitter must retrieve the list of downstream ReceiverIDs; the number of IDs is derived from a 10-bit DEVICE_COUNT/message-size field in the sink's RxStatus register read over the DDC/I2C channel. That length feeds directly into an I2C read into the fixed rx_id_list[177] array. Because the value can be as large as 1023 while the destination is only 177 bytes, the copy overruns the buffer - a classic CWE-787 out-of-bounds write. The DisplayPort branch of the same driver already clamped this length; the fix ports the identical clamp to the HDMI branch (cherry-picked from upstream commit 229212219e42). Affected CPEs are all cpe:2.3:o:linux:linux_kernel, including 7.1:rc1/rc2/rc3.

RemediationAI

Apply the vendor-released kernel patch: upgrade to a fixed stable build - 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 7.0.13, or 6.18.36/7.1 or later - matching your kernel series, per the kernel.org stable commits (https://git.kernel.org/stable/c/1906064d50d194a145486e5caf3db3e708b6f6ef and siblings). Distribution users should take the corresponding vendor kernel update rather than hand-patching. Where immediate patching is not possible, the practical compensating control is physical: do not connect untrusted or unknown HDMI repeaters/splitters/adapters to AMD-GPU systems, since the attack requires attacker-controlled HDMI sink hardware; on systems that do not need protected-content playback you can also disable HDCP (e.g. avoid HDCP-required workflows), which removes the repeater-authentication path entirely at the cost of losing playback of HDCP-protected content. These controls only reduce exposure and are not a substitute for the kernel update.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed

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CVE-2026-53137 vulnerability details – vuln.today
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