{"id":"CVE-2026-90260","revision":"874e894c033e4717817b60e7f05d5f66","records":[{"revision":"874e894c033e4717817b60e7f05d5f66","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90260","aliases":[],"title":"btrfs: zoned: don't clobber the extent buffer when zeroing it out","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: don't clobber the extent buffer when zeroing it out\n\nOn a zoned filesystem a freed-but-still-dirty tree block is written out\nas zeros (EXTENT_BUFFER_ZONED_ZEROOUT) only to keep the zone write\npointer advancing. btree_csum_one_bio() implemented this by memzeroing\nthe extent buffer's own folios before submission.\n\nThat destroys the in-memory buffer while it may still be referenced. In\nparticular btrfs_free_tree_block() can run on it afterwards and reads\nthe header to add a delayed reference; once the header has been zeroed\nit frees bytenr 0 and corrupts the extent tree (the\nbtrfs_header_bytenr(buf) != 0 ASSERT in btrfs_free_tree_block(), or an\n\"unable to find ref\" abort). It is flaky and reproduces under fsstress,\ne.g. generic/461 and generic/013.\n\nWrite the zeros to disk from the shared zero page instead and leave the\nextent buffer content untouched, so any later reference - including the\ndelayed reference from btrfs_free_tree_block() - still sees a valid\nheader. end_bbio_meta_write() now clears writeback on the buffer's own\nfolios, as the bio no longer carries them.","state":0,"publishedAt":"2026-09-17T16:07:58.102+00:00","modifiedAt":"2026-10-21T12:50:42.251+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/disk-io.c\",\n                        \"fs/btrfs/extent_io.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"aa6313e6ff2bfbf736a2739047bba355d8241584\",\n                            \"lessThan\": \"efa5084d08030aa557fdefa3e4a73b2501b7d207\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"aa6313e6ff2bfbf736a2739047bba355d8241584\",\n                            \"lessThan\": \"92484ad014f2e2b0e0e7bbc1610951e978cf557c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"aa6313e6ff2bfbf736a2739047bba355d8241584\",\n                            \"lessThan\": \"98e3747587f9f87f010d8d7e55786216249a94af\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"aa6313e6ff2bfbf736a2739047bba355d8241584\",\n                            \"lessThan\": \"db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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/disk-io.c\",\n                        \"fs/btrfs/extent_io.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.114\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/efa5084d08030aa557fdefa3e4a73b2501b7d207","https://git.kernel.org/stable/c/92484ad014f2e2b0e0e7bbc1610951e978cf557c","https://git.kernel.org/stable/c/98e3747587f9f87f010d8d7e55786216249a94af","https://git.kernel.org/stable/c/db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90260","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90260","identifiers":["CVE-2026-90260"]},"retained":false,"historicalAffected":[]}],"coverage":[]}