356 lines
17 KiB
JSON
356 lines
17 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-2021-47600",
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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": "2024-05-24T15:11:00.736Z",
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"datePublished": "2024-06-19T14:54:00.981Z",
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"dateUpdated": "2026-08-05T08:48:32.894Z"
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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": "2026-08-05T08:48:32.894Z"
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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\ndm btree remove: fix use after free in rebalance_children()\n\nMove dm_tm_unlock() after dm_tm_dec()."
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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 UAF is in dm-btree rebalance_children(), reached via local dm-thin metadata updates (discard → dm_thin_remove_range → dm_btree_remove/remove_leaves) or CAP_SYS_ADMIN dm-ioctl pool messages, not via network or adjacent protocols.\nAC:L - An attacker who can discard/unmap on a thin volume fully drives btree shrinkage into the single-child collapse path where unlock precedes dm_block_location(); no conditions outside attacker control are required, and UAFs are AC:L per guidance.\nPR:L - On hosts already using dm-thin/LVM thin pools, an unprivileged user with access to a thin-backed filesystem or device can issue discards (e.g. deletes under discard mounts or BLKDISCARD) that hit this path; creating the pool needs CAP_SYS_ADMIN but is a deployment precondition.\nUI:N - The attacker triggers the vulnerable remove/rebalance path themselves through their own I/O or ioctls; no separate victim action is required.\nS:U - This is a host-kernel heap use-after-free within the same OS security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Unlocking the child block then reading dm_block_location(child) is a use-after-free on the bufio buffer; reclaim/spray of that object enables arbitrary kernel memory disclosure.\nI:H - The UAF can feed an attacker-controlled block number into dm_tm_dec(), corrupting the space map and yielding heap/metadata corruption primitives exploitable for arbitrary write and control-flow hijack.\nA:H - Any use-after-free can oops/panic the kernel (KASAN UAF or invalid access after reclaim), fully impacting availability even without successful code execution."
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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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"drivers/md/persistent-data/dm-btree-remove.c"
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],
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{
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"defaultStatus": "affected",
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"programFiles": [
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"drivers/md/persistent-data/dm-btree-remove.c"
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],
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"versions": [
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{
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"version": "3.2",
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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": "3.2",
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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": "4.4.296",
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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": "4.9.294",
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"lessThanOrEqual": "4.9.*",
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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": "4.14.259",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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},
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{
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"version": "4.19.222",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.168",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.88",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.11",
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"lessThanOrEqual": "5.15.*",
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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": "5.16",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"timestamp": "2024-06-20T17:58:48.172185Z",
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"id": "CVE-2021-47600",
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