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Linux Kernel CVE-2026-53213

| EUVDEUVD-2026-39304 MEDIUM
Memory Leak (CWE-401)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-3886-873f-6xpf
Information Disclosure Linux Red Hat Suse
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
2.5 LOW

AC:H because exploitation requires krealloc() failure under memory pressure, a non-default condition; A:L for gradual incremental leak rather than immediate denial of service.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
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
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jul 02, 2026 - 23:18 vuln.today
CVSS changed
Jul 02, 2026 - 21:07 NVD
5.5 (MEDIUM)
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
MEDIUM 5.5

DescriptionNVD

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

drm/vc4: fix krealloc() memory leak

Don't just overwrite the original pointer passed to krealloc() with its return value without checking latter:

MEM = krealloc(MEM, SZ, GFP);

If krealloc() returns NULL, that erases the pointer to the still allocated memory, hence leaks this memory. Instead, use a temporary variable, check it's not NULL and only then assign it to the original pointer:

TMP = krealloc(MEM, SZ, GFP); if (!TMP) return; MEM = TMP;

While on it, use krealloc_array().

AnalysisAI

Memory leak in the Linux kernel's drm/vc4 (Broadcom VideoCore IV DRM) driver allows a local low-privileged user to gradually exhaust kernel memory under allocation-failure conditions. The flaw arises because the return value of krealloc() is assigned directly back to the original pointer without a NULL check - if krealloc() fails and returns NULL, the reference to the previously allocated buffer is silently overwritten, permanently leaking that memory. No public exploit code is identified at time of analysis, and EPSS probability is extremely low at 0.18% (8th percentile), consistent with the local-only, condition-dependent nature of the bug.

Technical ContextAI

The vulnerability resides in the drm/vc4 subsystem of the Linux kernel (CPE: cpe:2.3:o:linux:linux_kernel:*), which implements the DRM/KMS driver for Broadcom's VideoCore IV GPU, primarily used on Raspberry Pi hardware. CWE-401 (Missing Release of Memory after Effective Lifetime) describes the root cause: the pattern 'ptr = krealloc(ptr, new_size, flags)' is inherently unsafe because krealloc() may fail and return NULL under memory pressure. When this happens, the original allocation remains live in kernel heap but its pointer is lost, constituting a kernel memory leak. The correct pattern requires a temporary variable to hold the return value, a NULL check, and only then reassignment. The fix also replaces krealloc() with krealloc_array() to add integer overflow protection on the size calculation. The bug has been present since commit 6d45c81d229d71da54d374143e7d6abad4c0cf31 introduced the affected code path.

RemediationAI

Apply the vendor-released patches for the relevant stable branch: Linux 5.15.210, 6.1.176, 6.6.143, 6.12.94, 7.0.13, 6.18.36, or 7.1 (final release). Upstream fix commits are available at https://git.kernel.org/stable/c/e0ce103e89d61eef70edc1d1ae3bfd4c0aacbc2e (and sibling commits 02f5e4db, 30165a09, 4fc692dc, 5d563a5d, c034aa0b, fd87d696). Distribution maintainers (Debian, Ubuntu, RHEL, Fedora) will backport these to their kernel packages in routine security update cycles. If immediate patching is not possible on Raspberry Pi or other vc4 systems, the practical compensating control is ensuring sufficient memory headroom to minimize krealloc() failure probability - resource limits on processes interacting with DRM are insufficient to prevent kernel-side allocation pressure. The risk of deferring this patch is low given the non-critical, non-exploitable-remotely nature of the leak.

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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-2026-53213 vulnerability details – vuln.today
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