Bug 2448696 (CVE-2025-71268)

Summary: CVE-2025-71268 kernel: btrfs: fix reservation leak in some error paths when inserting inline extent
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A resource leak was found in the Linux kernel's btrfs filesystem. In __cow_file_range_inline(), when path allocation or transaction join fails, the function returns without calling btrfs_qgroup_free_data() to release reserved qgroup data. This causes qgroup reservations to accumulate over time, potentially exhausting quota resources.
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Description OSIDB Bzimport 2026-03-18 18:03:02 UTC 
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.
Comment 1 Jon Moroney 2026-03-18 19:33:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026031814-CVE-2025-71268-057a@gregkh/T