CVE-2026-43393
btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies()
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.
INFO
Published Date :
May 8, 2026, 3:16 p.m.
Last Modified :
May 26, 2026, 2:53 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Apply the patch for the btrfs chunk map leak.
- Update the Linux kernel to the fixed version.
- Ensure btrfs_map_block cleans up allocated chunk maps.
- Verify correct chunk map deallocation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43393.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43393 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43393
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43393 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43393 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
May. 26, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-401 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.12 up to (excluding) 6.12.78 *cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.9 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0e4aaf5a3212b6a469c2489637c29a8e2a5062a5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4f90c5c2698383984102401b1724b0b67da832ab Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7bdf00ed75c477252578068dba19934cd825f20a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f15fb3d41543244d1179f423da4a4832a55bc050 Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 08, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/0e4aaf5a3212b6a469c2489637c29a8e2a5062a5 Added Reference https://git.kernel.org/stable/c/4f90c5c2698383984102401b1724b0b67da832ab Added Reference https://git.kernel.org/stable/c/7bdf00ed75c477252578068dba19934cd825f20a Added Reference https://git.kernel.org/stable/c/f15fb3d41543244d1179f423da4a4832a55bc050