{"id":"CVE-2026-74572","revision":null,"records":[{"revision":"9ff990db2a0d4d5882aa918eb6ee9891","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74572","aliases":[],"title":"btrfs: zoned: fix deadlock between metadata writeback and transaction commit","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix deadlock between metadata writeback and transaction commit\n\nWhen writing out metadata extent buffers in a zoned filesystem,\nbtree_writepages() holds fs_info->zoned_meta_io_lock across the whole\nwriteback loop, including the call to btrfs_check_meta_write_pointer() ->\ncheck_bg_is_active().\n\nFor the tree-log block group, check_bg_is_active() may fail to activate\nthe zone and fall back to btrfs_zone_finish_one_bg() to free an active\nzone. That path waits for the running transaction to commit while still\nholding zoned_meta_io_lock, but the committer needs that same lock to\nwrite out the tree extents, so the two tasks deadlock:\n\n Task A (kworker, metadata writeback) Task B (fsstress, transaction commit)\n ------------------------------------ -------------------------------------\n wb_workfn() btrfs_commit_transaction(T)\n btree_writepages() btrfs_write_and_wait_transaction()\n btrfs_zoned_meta_io_lock() btrfs_write_marked_extents()\n btrfs_check_meta_write_pointer() btree_writepages()\n check_bg_is_active() [treelog_bg] btrfs_zoned_meta_io_lock()\n btrfs_zone_finish_one_bg() \n do_zone_finish()\n btrfs_inc_block_group_ro()\n btrfs_wait_for_commit()\n \n\nThe sibling branch in check_bg_is_active() already drops zoned_meta_io_lock\naround do_zone_finish() for this exact reason. Do the same in the tree-log\nbranch: release the lock around btrfs_zone_finish_one_bg() and re-acquire\nit afterwards. The lock only protects fs_info->active_{meta,system}_bg,\nwhich this branch does not touch, and ctx->zoned_bg keeps a reference to\nthe block group across the unlock, so nothing is lost while the lock\nis dropped.\n\nThis hang occasionally reproduces with fstests generic/475 on a zoned\nbtrfs filesystem.","state":0,"publishedAt":"2026-08-15T12:28:11.328+00:00","modifiedAt":"2026-10-16T19:05:56.826+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/btrfs/zoned.c\"\n ],\n \"versions\": [\n {\n \"version\": \"13bb483d32abb6f8ebd40141d87eb68f11cc2dd2\",\n \"lessThan\": \"18577e77c2c8adaadf1f7c6e9bcd1c0b14e5dcdd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"13bb483d32abb6f8ebd40141d87eb68f11cc2dd2\",\n \"lessThan\": \"c3320873e0c04ce7b746fc8fe948f07bbbbdec33\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"13bb483d32abb6f8ebd40141d87eb68f11cc2dd2\",\n \"lessThan\": \"deddd28fd83c264ee2ff5cd6b34449a9f1be6112\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"13bb483d32abb6f8ebd40141d87eb68f11cc2dd2\",\n \"lessThan\": \"75859a7cd77cd2ddaddbcb963e3fcd34738953af\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"13bb483d32abb6f8ebd40141d87eb68f11cc2dd2\",\n \"lessThan\": \"1ebe51c29fa9755d5b2fea28727c051117907cf8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fca3a1cd3ba47f1815e0c0fcdc9aafaf02ee0a75\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6.5.5\",\n \"lessThan\": \"6.6\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/btrfs/zoned.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.6\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.6\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.151\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.103\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.44\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.8\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/18577e77c2c8adaadf1f7c6e9bcd1c0b14e5dcdd","https://git.kernel.org/stable/c/c3320873e0c04ce7b746fc8fe948f07bbbbdec33","https://git.kernel.org/stable/c/deddd28fd83c264ee2ff5cd6b34449a9f1be6112","https://git.kernel.org/stable/c/75859a7cd77cd2ddaddbcb963e3fcd34738953af","https://git.kernel.org/stable/c/1ebe51c29fa9755d5b2fea28727c051117907cf8"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74572","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74572","identifiers":["CVE-2026-74572"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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