{"id":"CVE-2026-97415","title":"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","summary":"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. Severa…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= b64ec075bded2b30bcd90af5aa5256d2237c885d < 1370badf6b823ce3cde39a65f46f9e5dc7b4bf43","Linux >= b64ec075bded2b30bcd90af5aa5256d2237c885d < ba6c4fc662853f6662e4db060cf88ee994053e21","Linux >= b64ec075bded2b30bcd90af5aa5256d2237c885d < 9154542070ca7eadb3c764a882f39a127677854b","Linux >= b64ec075bded2b30bcd90af5aa5256d2237c885d < 74f577c722c99248d804eca18e7de7c5e47549d7","Linux >= b64ec075bded2b30bcd90af5aa5256d2237c885d < 0af37c217edf15fa21dac1c40822086df356c6bb","Linux 4.18"],"published":"2026-09-24","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:53.457","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97415","references":[{"url":"https://git.kernel.org/stable/c/0af37c217edf15fa21dac1c40822086df356c6bb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1370badf6b823ce3cde39a65f46f9e5dc7b4bf43","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/74f577c722c99248d804eca18e7de7c5e47549d7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9154542070ca7eadb3c764a882f39a127677854b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ba6c4fc662853f6662e4db060cf88ee994053e21","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00131,"epssPercentile":0.02702,"ingestedAt":"2026-09-24T16:47:15.886Z","slug":"CVE-2026-97415","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":210577,"id":"CVE-2026-97415","ts":1790316054913,"field":"cvss","old":null,"new":"7.8"},{"seq":210576,"id":"CVE-2026-97415","ts":1790316054913,"field":"severity","old":"none","new":"high"}]}