CVE-2026-53213 drm/vc4: fix krealloc() memory leak

What is CVE-2026-53213?

CVE-2026-53213 is a medium-severity denial of service vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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().

Weakness: CWE-401

Which versions are affected by CVE-2026-53213?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-53213?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-53213 being exploited?

There is no known exploitation of CVE-2026-53213 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-90558, BELL-CVE-2026-53213, DEBIAN-CVE-2026-53213, GHSA-3886-873f-6xpf, ROOT-OS-DEBIAN-11-CVE-2026-53213, ROOT-OS-DEBIAN-12-CVE-2026-53213 and 3 more.