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CVE-2026-97415

btrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: btrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF ROOT_REF and ROOT_BACKREF items contain a struct btrfs_root_ref followed by the subvolume name. Several readers assume that this layout is already valid and then use the on-disk name length directly. A corrupted item can therefore make those readers address bytes outside the item, and BTRFS_IOC_GET_SUBVOL_INFO can copy too many bytes into its fixed-size UAPI name buffer. Validate ROOT_REF and ROOT_BACKREF items in tree-checker before any reader uses them. Reject records that do not contain a non-empty name, whose name_len does not exactly describe the remaining item payload, or whose name exceeds BTRFS_NAME_LEN. For BTRFS_IOC_GET_SUBVOL_INFO, copy only the validated on-disk name_len instead of deriving the copy length from the item size. The ioctl result is zeroed when allocated. That leaves the existing trailing zero byte untouched.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected b64ec075bded2b30bcd90af5aa5256d2237c885d before 1370badf6b823ce3cde39a65f46f9e5dc7b4bf43; affected b64ec075bded2b30bcd90af5aa5256d2237c885d before ba6c4fc662853f6662e4db060cf88ee994053e21; affected b64ec075bded2b30bcd90af5aa5256d2237c885d before 9154542070ca7eadb3c764a882f39a127677854b; affected b64ec075bded2b30bcd90af5aa5256d2237c885d before 74f577c722c99248d804eca18e7de7c5e47549d7; affected b64ec075bded2b30bcd90af5aa5256d2237c885d before 0af37c217edf15fa21dac1c40822086df356c6bb
Linux / Linuxaffected 4.18; unaffected 0 before 4.18; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2 through *

CWE

No CWE identifiers supplied.

References