138 lines
7.8 KiB
JSON
138 lines
7.8 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-71159",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-01-13T15:30:19.665Z",
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"datePublished": "2026-01-23T15:23:57.824Z",
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"dateUpdated": "2026-08-05T12:12:25.188Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:12:25.188Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()\n\nPreviously, btrfs_get_or_create_delayed_node() set the delayed_node's\nrefcount before acquiring the root->delayed_nodes lock.\nCommit e8513c012de7 (\"btrfs: implement ref_tracker for delayed_nodes\")\nmoved refcount_set inside the critical section, which means there is\nno longer a memory barrier between setting the refcount and setting\nbtrfs_inode->delayed_node.\n\nWithout that barrier, the stores to node->refs and\nbtrfs_inode->delayed_node may become visible out of order. Another\nthread can then read btrfs_inode->delayed_node and attempt to\nincrement a refcount that hasn't been set yet, leading to a\nrefcounting bug and a use-after-free warning.\n\nThe fix is to move refcount_set back to where it was to take\nadvantage of the implicit memory barrier provided by lock\nacquisition.\n\nBecause the allocations now happen outside of the lock's critical\nsection, they can use GFP_NOFS instead of GFP_ATOMIC."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - A remote attacker can reach the path through a writable Btrfs-backed ksmbd guest share: SMB2 WRITE reaches ksmbd_vfs_write(), kernel_write(), and the Btrfs ordered-write completion path. This is a reasonable network-facing Btrfs deployment.\nAC:L - Concurrent writes create multiple ordered extents whose parallel end-I/O workers can race while publishing and acquiring the same delayed node. The attacker controls the workload and can repeatedly create both sides of the race.\nPR:N - Although ksmbd checks the session, writable tree connection, and file handle, a guest-writable share grants these without attacker credentials. No prior account, capability, or local privilege is therefore required in that deployment.\nUI:N - The attacker directly triggers the race with concurrent write requests; no separate victim action is required.\nS:U - The vulnerable Btrfs code and the resulting kernel memory corruption are within the same host-kernel security authority.\nC:H - The lost reference can leave a delayed-node pointer usable after its slab object is freed and reused. Exploitation of this kernel use-after-free can expose arbitrary kernel memory.\nI:H - Subsequent mutex, flag, counter, tree, and inode-item operations write through the stale pointer. Heap reuse and spraying can turn these writes into kernel memory corruption and potential code execution.\nA:H - The observed refcount failure raises a kernel warning, and use of the prematurely freed delayed node can cause an oops, panic, hang, or filesystem shutdown."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/btrfs/delayed-inode.c"
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],
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"versions": [
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{
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"version": "e8513c012de75fd65e2df5499572bc6ef3f6e409",
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"lessThan": "c8385851a5435f4006281828d428e5d0b0bbf8af",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e8513c012de75fd65e2df5499572bc6ef3f6e409",
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"lessThan": "83f59076a1ae6f5c6845d6f7ed3a1a373d883684",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/btrfs/delayed-inode.c"
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],
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"versions": [
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{
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"version": "6.18",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.18",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.6",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18",
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"versionEndExcluding": "6.18.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18",
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"versionEndExcluding": "6.19"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c8385851a5435f4006281828d428e5d0b0bbf8af"
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},
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{
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"url": "https://git.kernel.org/stable/c/83f59076a1ae6f5c6845d6f7ed3a1a373d883684"
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}
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],
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"title": "btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |