383 lines
19 KiB
JSON
383 lines
19 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-2021-47189",
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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": "2024-03-25T09:12:14.113Z",
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"datePublished": "2024-04-10T18:56:28.194Z",
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"dateUpdated": "2026-08-05T08:46:35.936Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:46:35.936Z"
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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 memory ordering between normal and ordered work functions\n\nOrdered work functions aren't guaranteed to be handled by the same thread\nwhich executed the normal work functions. The only way execution between\nnormal/ordered functions is synchronized is via the WORK_DONE_BIT,\nunfortunately the used bitops don't guarantee any ordering whatsoever.\n\nThis manifested as seemingly inexplicable crashes on ARM64, where\nasync_chunk::inode is seen as non-null in async_cow_submit which causes\nsubmit_compressed_extents to be called and crash occurs because\nasync_chunk::inode suddenly became NULL. The call trace was similar to:\n\n pc : submit_compressed_extents+0x38/0x3d0\n lr : async_cow_submit+0x50/0xd0\n sp : ffff800015d4bc20\n\n <registers omitted for brevity>\n\n Call trace:\n submit_compressed_extents+0x38/0x3d0\n async_cow_submit+0x50/0xd0\n run_ordered_work+0xc8/0x280\n btrfs_work_helper+0x98/0x250\n process_one_work+0x1f0/0x4ac\n worker_thread+0x188/0x504\n kthread+0x110/0x114\n ret_from_fork+0x10/0x18\n\nFix this by adding respective barrier calls which ensure that all\naccesses preceding setting of WORK_DONE_BIT are strictly ordered before\nsetting the flag. At the same time add a read barrier after reading of\nWORK_DONE_BIT in run_ordered_work which ensures all subsequent loads\nwould be strictly ordered after reading the bit. This in turn ensures\nare all accesses before WORK_DONE_BIT are going to be strictly ordered\nbefore any access that can occur in ordered_func."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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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:L - The bug is in btrfs async workqueue ordering during local writeback (write/fsync → delalloc → cow_file_range_async / btrfs_wq_submit_bio), not in a network-facing protocol handler.\nAC:L - An attacker can create many concurrent compression/async bio work items so worker threads race on WORK_DONE_BIT visibility; this manifested under load on ARM64 without relying on conditions outside attacker influence.\nPR:L - An unprivileged user with write access to a mounted btrfs (e.g. home directory) can trigger the path, and can enable per-file compression via chattr/FS_IOC_SETFLAGS on files they own.\nUI:N - The attacker triggers writeback themselves via ordinary writes/fsync; no separate victim action is required.\nS:U - Impact stays within the host kernel privilege boundary; this is not a VM/IOMMU/sandbox escape.\nC:H - Missing barriers allow ordered_func to observe torn producer state (extent lists, page pointer arrays, bio/csum fields), which can yield wild/stale pointer use and arbitrary kernel memory disclosure.\nI:H - The same torn shared state can drive submit paths with inconsistent pointers/metadata (compressed extent submission or async bio mapping), enabling memory corruption and integrity compromise beyond a clean crash.\nA:H - The bug causes kernel NULL dereferences and oops/hangs in async_cow_submit/submit_compressed_extents, as seen on ARM64."
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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/async-thread.c"
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],
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"fs/btrfs/async-thread.c"
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],
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"version": "0",
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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": "4.4.293",
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"lessThanOrEqual": "4.4.*",
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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": "4.9.291",
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"lessThanOrEqual": "4.9.*",
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"status": "unaffected",
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},
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{
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"version": "4.14.256",
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"lessThanOrEqual": "4.14.*",
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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": "4.19.218",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.162",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.82",
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},
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"version": "5.15.5",
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"lessThanOrEqual": "5.15.*",
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{
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"versionType": "original_commit_for_fix"
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}
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],
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"title": "btrfs: fix memory ordering between normal and ordered work functions",
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"content": {
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"timestamp": "2024-04-10T19:44:25.164224Z",
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"id": "CVE-2021-47189",
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"options": [
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