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CVE-2026-53213 Linux CVE debrief

CVE-2026-53213 is a vulnerability in the Linux kernel's drm/vc4 component. The issue involves a memory leak caused by improper handling of the krealloc() function. Specifically, the original pointer passed to krealloc() is overwritten with its return value without checking if the latter is NULL, leading to a memory leak. To fix this, a temporary variable should be used to check the return value of krealloc() before assigning it to the original pointer. Additionally, using krealloc_array() is recommended. The vulnerability was resolved through a series of kernel commits.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-25
Original CVE updated
2026-06-30
Advisory published
2026-06-25
Advisory updated
2026-06-30

Who should care

Linux kernel maintainers, Linux distribution vendors, and users of Linux-based systems should be aware of this vulnerability. The drm/vc4 component is used in various Linux kernel versions, and affected systems may be vulnerable to memory leaks or other potential attacks. Users should ensure they are running the latest kernel version or apply the provided patches.

Technical summary

The vulnerability is caused by a flawed krealloc() call in the drm/vc4 component of the Linux kernel. When krealloc() returns NULL, indicating a failed allocation, the original pointer is lost, resulting in a memory leak. The fix involves using a temporary variable to store the krealloc() return value and checking for NULL before updating the original pointer. This ensures that the original memory is not lost in case of a failed reallocation. Furthermore, using krealloc_array() can help prevent similar issues in the future.

Defensive priority

Medium priority should be given to patching this vulnerability, as it can lead to memory leaks and potentially be used in conjunction with other exploits. Linux kernel maintainers and distribution vendors should apply the provided patches or update to the latest kernel version.

Recommended defensive actions

  • Apply the provided kernel patches or update to the latest Linux kernel version.
  • Use krealloc_array() to prevent similar memory management issues.
  • Monitor Linux kernel updates and apply patches in a timely manner.
  • Perform regular vulnerability scans and risk assessments to identify potential affected systems.
  • Consider implementing additional memory protection mechanisms, such as address space layout randomization (ASLR) and data execution prevention (DEP).

Evidence notes

The CVE-2026-53213 vulnerability was discovered and resolved through a series of kernel commits. The issue was caused by improper handling of the krealloc() function in the drm/vc4 component. The provided source data includes references to the kernel commits that address this vulnerability.

Official resources

This article is AI-assisted and based on the supplied source corpus.