btrfs: zoned: fix deadlock waiting for ticket during data relocation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74319
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:32 UTC
Updated2026-08-17 06:19:26 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix deadlock waiting for ticket during data relocation When performing data relocation on a zoned filesystem, BTRFS can deadlock in handle_reserve_tickets(). The relocation process is waiting on a space reservation ticket that can never be fulfilled, because the relocation itself is the operation responsible for freeing up that space. Fix this by introducing a new flush state, BTRFS_RESERVE_FLUSH_ZONED_RELOCATION, specifically for data chunk allocation during zoned relocation. Like BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, this state uses priority_reclaim_data_space() instead of the normal flushing path, which avoids re-entering the relocation code and breaking the deadlock cycle. In btrfs_alloc_data_chunk_ondemand(), select this new flush state when the inode belongs to a data relocation root on a zoned filesystem.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.051880000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e2a7fd22378f6500bcf979edc71e6837271eacfd f84dbbaa988e1344634a20ddf6c7d51a99f12477 git Not specified
CNA Linux Linux affected e2a7fd22378f6500bcf979edc71e6837271eacfd 814c3b4ea357297c507158bceb07bcdc5fbe9808 git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f84dbbaa988e1344634a20ddf6c7d51a99f12477 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/814c3b4ea357297c507158bceb07bcdc5fbe9808 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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