CVE-2026-43393
Memory Leak in Linux Kernel Btrfs
Publication date: 2026-05-08
Last updated on: 2026-05-26
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
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 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
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
What immediate steps should I take to mitigate this vulnerability?
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.