CVE-2025-71268
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Memory Leak in Linux Kernel btrfs Inline Extent Reservation

Publication date: 2026-03-18

Last updated on: 2026-05-21

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix reservation leak in some error paths when inserting inline extent If we fail to allocate a path or join a transaction, we return from __cow_file_range_inline() without freeing the reserved qgroup data, resulting in a leak. Fix this by ensuring we call btrfs_qgroup_free_data() in such cases.

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Meta Information

Published
2026-03-18
Last Modified
2026-05-21
Generated
2026-07-06
AI Q&A
2026-03-18
EPSS Evaluated
2026-07-05
NVD
CVE-2025-71268
EUVD
EUVD-2025-208840

Affected Vendors & Products

Showing 8 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 6.7 (inc) to 6.12.70 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.124 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.10 (exc)
linux linux_kernel From 4.4 (inc) to 6.1.163 (exc)

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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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Executive Summary

This vulnerability exists in the Linux kernel's btrfs filesystem. It involves a reservation leak that occurs in certain error paths when inserting an inline extent. Specifically, if the system fails to allocate a path or join a transaction during the __cow_file_range_inline() function, it returns without freeing the reserved quota group (qgroup) data, causing a resource leak. The fix ensures that the reserved qgroup data is properly freed in these error cases.

Impact Analysis

The impact of this vulnerability is a resource leak in the btrfs filesystem. If the reserved qgroup data is not freed properly during certain error conditions, it could lead to inefficient resource usage or exhaustion over time. This might degrade system performance or stability, especially on systems heavily using btrfs with quota groups.

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