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.
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Meta Information
Published
2026-05-08
Last Modified
2026-05-26
Generated
2026-06-19
AI Q&A
2026-05-08
EPSS Evaluated
2026-06-18
NVD
CVE-2026-43393
EUVD
EUVD-2026-28699
Affected Vendors & Products
Showing 5 associated CPEs
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
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KEV
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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.
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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.

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.

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