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vuln-cve/data/2025/39xxx/CVE-2025-39800.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-39800",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T07:20:57.133Z",
"datePublished": "2025-09-15T12:36:43.043Z",
"dateUpdated": "2026-08-05T12:05:16.237Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:05:16.237Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: abort transaction on unexpected eb generation at btrfs_copy_root()\n\nIf we find an unexpected generation for the extent buffer we are cloning\nat btrfs_copy_root(), we just WARN_ON() and don't error out and abort the\ntransaction, meaning we allow to persist metadata with an unexpected\ngeneration. Instead of warning only, abort the transaction and return\n-EUCLEAN."
}
],
"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 - btrfs is a local filesystem; the vulnerable code is reached through the `BTRFS_IOC_SNAP_CREATE`/`SNAP_CREATE_V2` ioctl path or through relocation on a locally mounted volume. No remote peer data or network protocol handler reaches `btrfs_copy_root()`.\nAC:L - Once the volume carries a tree block with a future generation — a state the attacker authors directly in a crafted image, or that pre-exists from bit rot or an earlier bug — the trigger is a single deterministic ioctl with no race to win and no memory layout to groom. The attacker controls both the on-disk state and the snapshot request, so nothing is beyond their influence.\nPR:L - `__btrfs_ioctl_snap_create()` gates snapshots only on `inode_owner_or_capable()` against the source subvolume, and plain subvolume creation is explicitly unrestricted, so any unprivileged user with write access to a btrfs mount can create a subvolume and then snapshot it to drive `create_pending_snapshot()` into `btrfs_copy_root()`.\nUI:N - The attacker issues the snapshot ioctl themselves against a filesystem that is already mounted, and the balance/relocation path likewise runs without any victim action. No one has to open a file or mount anything at exploitation time.\nS:U - The mishandled metadata, the corrupted extent tree, and the resulting crashes all stay within the kernel's own security authority on the same host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Persisting the clone means the bogus-generation block later makes `btrfs_block_can_be_shared()` return false (`buf_gen > btrfs_root_last_snapshot()`), so COW skips ref accounting for a block the new snapshot references; extents are subsequently freed while still in use and reallocated to other files, letting the attacker read data belonging to other users through their own subvolume.\nI:H - The kernel writes metadata it has already recognised as invalid, and the resulting extent-refcount divergence causes in-use blocks to be handed out to unrelated files — arbitrary, persistent corruption of other users' file contents and of filesystem metadata that survives reboot.\nA:H - The `WARN_ON()` alone is an immediate panic under `panic_on_warn`, and the corrupted metadata that gets committed makes later tree reads fail the parent-transid check, leaving the filesystem unmountable or forcing it read-only — a persistent denial of service the attacker can trigger at will."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/btrfs/ctree.c"
],
"versions": [
{
"version": "be20aa9dbadc8c06283784ee12bbc0d97dea3418",
"lessThan": "4290e34fb87ae556b12c216efd0ae91583446b7a",
"status": "affected",
"versionType": "git"
},
{
"version": "be20aa9dbadc8c06283784ee12bbc0d97dea3418",
"lessThan": "4734255ef39b416864139dcda96a387fe5f33a6a",
"status": "affected",
"versionType": "git"
},
{
"version": "be20aa9dbadc8c06283784ee12bbc0d97dea3418",
"lessThan": "da2124719f386b6e5d4d4b1a2e67c440e4d5892f",
"status": "affected",
"versionType": "git"
},
{
"version": "be20aa9dbadc8c06283784ee12bbc0d97dea3418",
"lessThan": "f4f5bd9251a4cbe55aaa05725c6c3c32ad1f74b3",
"status": "affected",
"versionType": "git"
},
{
"version": "be20aa9dbadc8c06283784ee12bbc0d97dea3418",
"lessThan": "33e8f24b52d2796b8cfb28c19a1a7dd6476323a8",
"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/ctree.c"
],
"versions": [
{
"version": "2.6.29",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.29",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.149",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.103",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.44",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.16.4",
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.17",
"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": "2.6.29",
"versionEndExcluding": "6.1.149"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.6.103"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.12.44"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.16.4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "6.17"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/4290e34fb87ae556b12c216efd0ae91583446b7a"
},
{
"url": "https://git.kernel.org/stable/c/4734255ef39b416864139dcda96a387fe5f33a6a"
},
{
"url": "https://git.kernel.org/stable/c/da2124719f386b6e5d4d4b1a2e67c440e4d5892f"
},
{
"url": "https://git.kernel.org/stable/c/f4f5bd9251a4cbe55aaa05725c6c3c32ad1f74b3"
},
{
"url": "https://git.kernel.org/stable/c/33e8f24b52d2796b8cfb28c19a1a7dd6476323a8"
}
],
"title": "btrfs: abort transaction on unexpected eb generation at btrfs_copy_root()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T17:43:30.834Z"
}
},
{
"x_adpType": "supplier",
"providerMetadata": {
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP",
"dateUpdated": "2026-05-12T12:07:08.998Z"
},
"affected": [
{
"vendor": "Siemens",
"product": "SIMATIC CN 4100",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "V5.0",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
}
],
"references": [
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
}
]
}
]
}
}
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