{"id":"CVE-2026-97415","published":"2026-09-24T17:17:19.223","lastModified":"2026-09-25T13:17:25.033","description":"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.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0af37c217edf15fa21dac1c40822086df356c6bb","tags":[]},{"url":"https://git.kernel.org/stable/c/74f577c722c99248d804eca18e7de7c5e47549d7","tags":[]},{"url":"https://git.kernel.org/stable/c/9154542070ca7eadb3c764a882f39a127677854b","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}