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Linux Kernel CVE-2026-53325

| EUVDEUVD-2026-40034 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-06-29 Linux GHSA-vhjq-v866-4c7f
Linux Amd Denial Of Service Null Pointer Dereference
5.5
CVSS 3.1 · NVD
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Severity by source

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

Local vector because attack requires module load on the host; PR:L reflects low-privilege trigger path; pure availability impact (kernel crash) with no confidentiality or integrity effects.

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

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

5
Analysis Generated
Jul 06, 2026 - 20:54 vuln.today
CVSS changed
Jul 06, 2026 - 20:22 NVD
5.5 (MEDIUM)
Patch available
Jun 29, 2026 - 07:01 EUVD
CVE Published
Jun 29, 2026 - 04:53 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 29, 2026 - 04:53 nvd
MEDIUM 5.5

DescriptionNVD

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

agp/amd64: Fix broken error propagation in agp_amd64_probe()

A NULL pointer dereference was observed in the AMD64 AGP driver when running in a virtualized environment (e.g. qemu/kvm) without a physical AMD northbridge. The crash occurs in amd64_fetch_size() when attempting to dereference the pointer returned by node_to_amd_nb(0).

The root cause of this crash is broken error propagation in agp_amd64_probe(): When no AMD northbridges are found, cache_nbs() correctly returns -ENODEV. However, the probe function erroneously checks the return value against exactly -1, rather than < 0.

As a result, the hardware absence error is masked, allowing the driver to improperly proceed with initialization. It eventually calls agp_add_bridge(), which invokes amd64_fetch_size(). Since the hardware does not exist, node_to_amd_nb(0) returns NULL, leading to a General Protection Fault (GPF) when accessing its ->misc member.

Fix the issue by correcting the error check in agp_amd64_probe() to abort properly when cache_nbs() returns any negative error code. This prevents the driver from erroneously proceeding without hardware, thereby avoiding the subsequent NULL pointer dereference at its source.

AnalysisAI

NULL pointer dereference in the Linux kernel's AMD64 AGP driver crashes systems running in virtualized environments without physical AMD northbridge hardware. Broken error propagation in agp_amd64_probe() - comparing cache_nbs() return value against exactly -1 rather than < 0 - masks the -ENODEV error code, allowing the driver to proceed with initialization, ultimately causing a General Protection Fault in amd64_fetch_size() when node_to_amd_nb(0) returns NULL. No public exploit has been identified at time of analysis, EPSS is 0.18% (7th percentile), and impact is confined to local denial of service via kernel crash; patches are confirmed available across multiple stable branches.

Technical ContextAI

The vulnerability resides in the AGP (Accelerated Graphics Port) subsystem of the Linux kernel, specifically the AMD64 northbridge driver. CWE-476 (NULL Pointer Dereference) captures the root cause: cache_nbs() correctly returns -ENODEV (value -19) when no AMD northbridge hardware is present, but agp_amd64_probe() only catches -1 as an error sentinel, allowing all other negative error codes to pass undetected. The driver then calls agp_add_bridge(), which invokes amd64_fetch_size(), which calls node_to_amd_nb(0) - returning NULL in the absence of hardware - and then dereferences its ->misc member, triggering a General Protection Fault. AGP is a legacy graphics interconnect largely replaced by PCI Express; the agp_amd64 module is relevant only on older AMD64-platform hardware or when explicitly loaded. CPE: cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*. The bug appears to have been present since at least Linux 2.6.18 per EUVD data.

RemediationAI

Upgrade to a patched kernel release: Linux 6.18.37, 7.0.14, 7.1.2, or 7.2-rc1, as confirmed by EUVD data. Upstream fix commits are available at https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1 (and the parallel stable-branch commits linked in the references). If immediate kernel upgrade is not feasible, blacklist the agp_amd64 module by adding blacklist agp_amd64 to /etc/modprobe.d/blacklist.conf and running update-initramfs -u; this prevents the vulnerable code from loading entirely. The trade-off is loss of AMD64 AGP bridge functionality, which is irrelevant on any modern, virtualized, or PCI-Express-only system. For cloud and VM environments with no AGP hardware, this module should already be absent from the loaded module set; confirm with lsmod | grep agp.

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Same weakness CWE-476 – NULL Pointer Dereference

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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-2026-53325 vulnerability details – vuln.today
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