{"id":"CVE-2026-97415","summary":"btrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF\n\nROOT_REF and ROOT_BACKREF items contain a struct btrfs_root_ref followed\nby the subvolume name. Several readers assume that this layout is already\nvalid and then use the on-disk name length directly. A corrupted item can\ntherefore make those readers address bytes outside the item, and\nBTRFS_IOC_GET_SUBVOL_INFO can copy too many bytes into its fixed-size UAPI\nname buffer.\n\nValidate ROOT_REF and ROOT_BACKREF items in tree-checker before any reader\nuses them. Reject records that do not contain a non-empty name, whose\nname_len does not exactly describe the remaining item payload, or whose\nname exceeds BTRFS_NAME_LEN.\n\nFor BTRFS_IOC_GET_SUBVOL_INFO, copy only the validated on-disk name_len\ninstead of deriving the copy length from the item size. The ioctl result is\nzeroed when allocated. That leaves the existing trailing zero byte\nuntouched.","modified":"2026-09-26T03:48:27.064499170Z","published":"2026-09-24T16:03:22.780Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97415.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0af37c217edf15fa21dac1c40822086df356c6bb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74f577c722c99248d804eca18e7de7c5e47549d7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9154542070ca7eadb3c764a882f39a127677854b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97415.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97415"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2ede0daf01549cecf4bb0962c46dc47382047523"},{"fixed":"9154542070ca7eadb3c764a882f39a127677854b"},{"fixed":"74f577c722c99248d804eca18e7de7c5e47549d7"},{"fixed":"0af37c217edf15fa21dac1c40822086df356c6bb"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97415.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.37"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97415.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}