{"api_version":"1","generated_at":"2026-08-21T00:31:55+00:00","cve":"CVE-2026-74319","urls":{"html":"https://cve.report/CVE-2026-74319","api":"https://cve.report/api/cve/CVE-2026-74319.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74319","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74319"},"summary":{"title":"btrfs: zoned: fix deadlock waiting for ticket during data relocation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix deadlock waiting for ticket during data relocation\n\nWhen performing data relocation on a zoned filesystem, BTRFS can deadlock\nin handle_reserve_tickets(). The relocation process is waiting on a space\nreservation ticket that can never be fulfilled, because the relocation\nitself is the operation responsible for freeing up that space.\n\nFix this by introducing a new flush state,\nBTRFS_RESERVE_FLUSH_ZONED_RELOCATION, specifically for data chunk\nallocation during zoned relocation. Like\nBTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, this state uses\npriority_reclaim_data_space() instead of the normal flushing path, which\navoids re-entering the relocation code and breaking the deadlock cycle.\n\nIn btrfs_alloc_data_chunk_ondemand(), select this new flush state when the\ninode belongs to a data relocation root on a zoned filesystem.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:32","updated_at":"2026-08-17 06:19:26"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/f84dbbaa988e1344634a20ddf6c7d51a99f12477","name":"https://git.kernel.org/stable/c/f84dbbaa988e1344634a20ddf6c7d51a99f12477","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/814c3b4ea357297c507158bceb07bcdc5fbe9808","name":"https://git.kernel.org/stable/c/814c3b4ea357297c507158bceb07bcdc5fbe9808","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74319","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74319","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e2a7fd22378f6500bcf979edc71e6837271eacfd f84dbbaa988e1344634a20ddf6c7d51a99f12477 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e2a7fd22378f6500bcf979edc71e6837271eacfd 814c3b4ea357297c507158bceb07bcdc5fbe9808 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74319","cve":"CVE-2026-74319","epss":"0.001550000","percentile":"0.051880000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:46"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/btrfs/delalloc-space.c","fs/btrfs/space-info.c","fs/btrfs/space-info.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f84dbbaa988e1344634a20ddf6c7d51a99f12477","status":"affected","version":"e2a7fd22378f6500bcf979edc71e6837271eacfd","versionType":"git"},{"lessThan":"814c3b4ea357297c507158bceb07bcdc5fbe9808","status":"affected","version":"e2a7fd22378f6500bcf979edc71e6837271eacfd","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/btrfs/delalloc-space.c","fs/btrfs/space-info.c","fs/btrfs/space-info.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.1"},{"lessThan":"7.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"7.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix deadlock waiting for ticket during data relocation\n\nWhen performing data relocation on a zoned filesystem, BTRFS can deadlock\nin handle_reserve_tickets(). The relocation process is waiting on a space\nreservation ticket that can never be fulfilled, because the relocation\nitself is the operation responsible for freeing up that space.\n\nFix this by introducing a new flush state,\nBTRFS_RESERVE_FLUSH_ZONED_RELOCATION, specifically for data chunk\nallocation during zoned relocation. Like\nBTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, this state uses\npriority_reclaim_data_space() instead of the normal flushing path, which\navoids re-entering the relocation code and breaking the deadlock cycle.\n\nIn btrfs_alloc_data_chunk_ondemand(), select this new flush state when the\ninode belongs to a data relocation root on a zoned filesystem."}],"providerMetadata":{"dateUpdated":"2026-08-17T05:17:09.243Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f84dbbaa988e1344634a20ddf6c7d51a99f12477"},{"url":"https://git.kernel.org/stable/c/814c3b4ea357297c507158bceb07bcdc5fbe9808"}],"title":"btrfs: zoned: fix deadlock waiting for ticket during data relocation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74319","datePublished":"2026-08-15T05:58:16.142Z","dateReserved":"2026-08-15T05:44:03.884Z","dateUpdated":"2026-08-17T05:17:09.243Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:32","lastModifiedDate":"2026-08-17 06:19:26","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74319","Ordinal":"1","Title":"btrfs: zoned: fix deadlock waiting for ticket during data reloca","CVE":"CVE-2026-74319","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74319","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix deadlock waiting for ticket during data relocation\n\nWhen performing data relocation on a zoned filesystem, BTRFS can deadlock\nin handle_reserve_tickets(). The relocation process is waiting on a space\nreservation ticket that can never be fulfilled, because the relocation\nitself is the operation responsible for freeing up that space.\n\nFix this by introducing a new flush state,\nBTRFS_RESERVE_FLUSH_ZONED_RELOCATION, specifically for data chunk\nallocation during zoned relocation. Like\nBTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, this state uses\npriority_reclaim_data_space() instead of the normal flushing path, which\navoids re-entering the relocation code and breaking the deadlock cycle.\n\nIn btrfs_alloc_data_chunk_ondemand(), select this new flush state when the\ninode belongs to a data relocation root on a zoned filesystem.","Type":"Description","Title":"btrfs: zoned: fix deadlock waiting for ticket during data reloca"}]}}}