btrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF
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.
CVE-2026-97415
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-97415
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b64ec075bded2b30bcd90af5aa5256d2237c885d",
"lessThan": "1370badf6b823ce3cde39a65f46f9e5dc7b4bf43",
"versionType": "git"
},
{
"status": "affected",
"version": "b64ec075bded2b30bcd90af5aa5256d2237c885d",
"lessThan": "ba6c4fc662853f6662e4db060cf88ee994053e21",
"versionType": "git"
},
{
"status": "affected",
"version": "b64ec075bded2b30bcd90af5aa5256d2237c885d",
"lessThan": "9154542070ca7eadb3c764a882f39a127677854b",
"versionType": "git"
},
{
"status": "affected",
"version": "b64ec075bded2b30bcd90af5aa5256d2237c885d",
"lessThan": "74f577c722c99248d804eca18e7de7c5e47549d7",
"versionType": "git"
},
{
"status": "affected",
"version": "b64ec075bded2b30bcd90af5aa5256d2237c885d",
"lessThan": "0af37c217edf15fa21dac1c40822086df356c6bb",
"versionType": "git"
}
],
"programFiles": [
"fs/btrfs/ioctl.c",
"fs/btrfs/tree-checker.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/btrfs/ioctl.c",
"fs/btrfs/tree-checker.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97415
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #8306 · Revision 1
- Added to Heist Feed
- Publisher date