CVE-2026-43393

Analyzed Analyzed - Analysis Complete

Memory Leak in Linux Kernel Btrfs

Publication date: 2026-05-08

Last updated on: 2026-05-26

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies() Fix a chunk map leak in btrfs_map_block(): if we return early with -EINVAL, we're not freeing the chunk map that we've just looked up.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-08

Last Modified

2026-05-26

Generated

2026-07-09

AI Q&A

2026-05-08

EPSS Evaluated

2026-07-08

NVD

CVE-2026-43393

EUVD

EUVD-2026-28699

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.12 (inc) to 6.12.78 (exc)
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	From 6.13 (inc) to 6.18.19 (exc)
linux	linux_kernel	From 6.19 (inc) to 6.19.9 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-401	The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Attack-Flow Graph

Executive Summary

This vulnerability is a memory leak in the Linux kernel's Btrfs filesystem code. Specifically, in the function btrfs_map_block(), when an error occurs and the function returns early with the error code -EINVAL, the chunk map that was looked up is not properly freed, causing a leak of memory resources.

Mitigation Strategies

The vulnerability is a chunk map leak in the btrfs_map_block() function of the Linux kernel's Btrfs filesystem implementation. To mitigate this vulnerability, you should update your Linux kernel to a version where this issue has been fixed.

Since the issue is resolved by a patch in the kernel, applying the latest kernel updates from your distribution or compiling and installing a patched kernel version is the immediate step to prevent this vulnerability.

Impact Analysis

The impact of this vulnerability is that it can cause a memory leak in the Linux kernel when using the Btrfs filesystem. Over time, this leak could lead to increased memory usage, potentially degrading system performance or causing resource exhaustion, which might result in system instability or crashes.

Hi! I’m here to help you understand CVE-2026-43393. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70