{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97415", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T14:53:16.867Z", "datePublished": "2026-09-24T16:03:22.780Z", "dateUpdated": "2026-09-25T12:43:50.260Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-25T12:43:50.260Z"}, "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The attacker-controlled bytes are the on-disk BTRFS_ROOT_BACKREF_KEY item (struct btrfs_root_ref plus the following name) in the tree of tree roots. After that image is mounted, ioctl(BTRFS_IOC_GET_SUBVOL_INFO) reaches _btrfs_ioctl_get_subvol_info() via btrfs_ioctl() and read_extent_buffer()s the item; no SMB/NFS/packet field carries that payload.\nAC:L - check_leaf_item() had no BTRFS_ROOT_REF_KEY/BTRFS_ROOT_BACKREF_KEY case, so btrfs_check_leaf() accepted a ROOT_BACKREF whose item_size filled the leaf (~BTRFS_LEAF_DATA_SIZE). _btrfs_ioctl_get_subvol_info() then copied item_size-sizeof(struct btrfs_root_ref) into name[256] on every ioctl; the attacker fully controls that image.\nPR:L - btrfs_ioctl() dispatches BTRFS_IOC_GET_SUBVOL_INFO and BTRFS_IOC_INO_LOOKUP_USER with no capable() check. btrfs_fs_type has no FS_USERNS_MOUNT, so the severe case is an unprivileged session user whose USB/loop btrfs image is mounted by udisks2/polkit, then opens any fd in that subvolume and issues the ioctl.\nUI:N - The attacker crafts the ROOT_BACKREF, has that local image mounted, and themselves calls BTRFS_IOC_GET_SUBVOL_INFO (or BTRFS_IOC_INO_LOOKUP_USER, which copies the same item via btrfs_search_path_in_tree_user()) on their own fd. Automount of that local/removable image is not a separate victim action once AV is Local.\nS:U - The overflow is in the host kernel's kzalloc'd btrfs_ioctl_get_subvol_info_args (and ino_lookup_user args) while parsing tree_root ROOT_BACKREF/ROOT_REF items. No KVM/Xen guest-to-host, IOMMU, or sandbox boundary is crossed.\nC:H - _btrfs_ioctl_get_subvol_info() and btrfs_search_path_in_tree_user() call read_extent_buffer() with a length taken from the on-disk item_size into name[BTRFS_VOL_NAME_MAX+1] (256 bytes). That out-of-bounds write of attacker-chosen leaf bytes into adjacent slab is a kernel-memory disclosure primitive.\nI:H - The same unbounded read_extent_buffer() into the 256-byte name[] of the kzalloc'd ioctl args overwrites neighboring heap objects with attacker-controlled ROOT_BACKREF payload, which is sufficient for an arbitrary kernel write and control-flow hijacking.\nA:H - Copying a leaf-sized ROOT_BACKREF past btrfs_ioctl_get_subvol_info_args.name[256], or writing args->name[item_len]='\\0' in btrfs_search_path_in_tree_user() with that huge item_len, oopses or panics the kernel on the slab out-of-bounds access."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/ioctl.c", "fs/btrfs/tree-checker.c"], "versions": [{"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "9154542070ca7eadb3c764a882f39a127677854b", "status": "affected", "versionType": "git"}, {"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "74f577c722c99248d804eca18e7de7c5e47549d7", "status": "affected", "versionType": "git"}, {"version": "2ede0daf01549cecf4bb0962c46dc47382047523", "lessThan": "0af37c217edf15fa21dac1c40822086df356c6bb", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/ioctl.c", "fs/btrfs/tree-checker.c"], "versions": [{"version": "2.6.37", "status": "affected"}, {"version": "0", "lessThan": "2.6.37", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9154542070ca7eadb3c764a882f39a127677854b"}, {"url": "https://git.kernel.org/stable/c/74f577c722c99248d804eca18e7de7c5e47549d7"}, {"url": "https://git.kernel.org/stable/c/0af37c217edf15fa21dac1c40822086df356c6bb"}], "title": "btrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/btrfs/ioctl.c", "fs/btrfs/tree-checker.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9154542070ca7eadb3c764a882f39a127677854b", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}, {"lessThan": "74f577c722c99248d804eca18e7de7c5e47549d7", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}, {"lessThan": "0af37c217edf15fa21dac1c40822086df356c6bb", "status": "affected", "version": "2ede0daf01549cecf4bb0962c46dc47382047523", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/ioctl.c", "fs/btrfs/tree-checker.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.37"}, {"lessThan": "2.6.37", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-97415", "lastModified": "2026-09-25T13:17:25.033", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-24T17:17:19.223", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0af37c217edf15fa21dac1c40822086df356c6bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/74f577c722c99248d804eca18e7de7c5e47549d7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9154542070ca7eadb3c764a882f39a127677854b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,9154542070ca7eadb3c764a882f39a127677854b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,74f577c722c99248d804eca18e7de7c5e47549d7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,0af37c217edf15fa21dac1c40822086df356c6bb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.111)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.53)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-24T22:30:16.967796+00:00", "updated": "2026-09-25T10:15:07.368802+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}