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Linux Kernel CVE-2026-53138

| EUVDEUVD-2026-39343 HIGH
Out-of-bounds Read (CWE-125)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-qc6f-vg59-3945
Linux Amd Buffer Overflow Information Disclosure Red Hat Suse
7.1
CVSS 3.1 · NVD
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Severity by source

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

Supplying a malformed VBIOS requires privileged control over the firmware image (PR:H); vector is local, the OOB read is small (C:L), and the primary impact is a probe-time hang (A:H).

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

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

5
Analysis Generated
Jul 07, 2026 - 16:55 vuln.today
CVSS changed
Jul 07, 2026 - 16:52 NVD
7.1 (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 7.1

DescriptionNVD

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

drm/amd/display: Bound VBIOS record-chain walk loops

[Why & How] All record-chain walk loops in bios_parser.c and bios_parser2.c use for(;;) and only terminate on a 0xFF record_type sentinel or zero record_size. A malformed VBIOS image missing the terminator record causes unbounded iteration at probe time, potentially hundreds of thousands of iterations with record_size=1. In the final iterations near the BIOS image boundary, struct casts beyond the 2-byte header validated by GET_IMAGE can also read out of bounds.

Cap all 14 record-chain walk loops to BIOS_MAX_NUM_RECORD (256) iterations. The atombios.h defines up to 22 distinct record types and atomfirmware.h has 13. Assuming an average of less than 10 records per type (which is reasonable since most are connector- based) 256 is a generous upper bound.

(cherry picked from commit 95700a3d660287ed657d6892f7be9ffc0e294a93)

AnalysisAI

Out-of-bounds read and unbounded-iteration denial of service in the Linux kernel's AMD Display (amdgpu DC) driver arises when the bios_parser/bios_parser2 code walks VBIOS record chains that lack a proper 0xFF terminator record. A local attacker able to supply a malformed VBIOS image can force hundreds of thousands of probe-time iterations (with record_size=1) and, near the image boundary, trigger struct casts that read past the 2-byte header validated by GET_IMAGE. There is no public exploit identified at time of analysis, and the EPSS score is low (0.17%, 6th percentile), consistent with a local, firmware-dependent memory-safety bug rather than a broadly exploited remote flaw.

Technical ContextAI

The affected code is the AMD Display Core (DC) VBIOS parsing layer, bios_parser.c and bios_parser2.c, which interprets the video BIOS (VBIOS/atombios/atomfirmware) image handed to the amdgpu driver during device probe. AMD VBIOS uses linked 'record chains' - sequences of variable-length records terminated by a sentinel record_type of 0xFF or a zero record_size. All 14 record-chain walk loops used unbounded for(;;) constructs that trusted the presence of the terminator. Per CWE-125 (Out-of-bounds Read), a malformed image missing the terminator causes the parser to iterate off the end of the buffer; the GET_IMAGE macro validates only a 2-byte header, so casting subsequent bytes to larger record structs reads memory beyond the validated bounds. The fix caps every walk loop at BIOS_MAX_NUM_RECORD (256) iterations - a generous ceiling given atombios.h defines ~22 record types and atomfirmware.h ~13, mostly connector-based.

RemediationAI

Vendor-released patch: upgrade to a fixed stable kernel - 7.1, 7.0.13, 6.18.36, or 6.12.94 (or later within each series), which cap all 14 record-chain walk loops at BIOS_MAX_NUM_RECORD (256) iterations. The upstream fix is the cherry-picked commit 95700a3d660287ed657d6892f7be9ffc0e294a93, with stable backports at https://git.kernel.org/stable/c/0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1, https://git.kernel.org/stable/c/2645e3caf7e013189da9c6ff621d006cca5a538b, https://git.kernel.org/stable/c/6173cfea2f916e01c4f98e29cd654384a05e32a3, and https://git.kernel.org/stable/c/ff287df16a1a58aca78b08d1f3ee09fc44da0351. If you cannot patch immediately, the practical compensating control is to avoid parsing untrusted VBIOS: do not use the amdgpu VBIOS-override path (custom vbios_rom/IGP override files) and restrict physical and administrative access so an attacker cannot substitute a malformed GPU ROM or passthrough device - the trade-off is loss of legitimate VBIOS-override workflows used in some GPU-passthrough/multi-GPU setups. On systems without AMD GPUs the amdgpu path is never exercised and risk is effectively nil.

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Same weakness CWE-125 – Out-of-bounds Read

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.168 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.149 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.197 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.145 Affected
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

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CVE-2026-53138 vulnerability details – vuln.today
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