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vuln-cve/data/2024/47xxx/CVE-2024-47736.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2024-47736",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-09-30T16:00:12.958Z",
"datePublished": "2024-10-21T12:14:06.530Z",
"dateUpdated": "2026-11-10T12:33:22.888Z"
},
"containers": {
"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T20:39:45.456Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: handle overlapped pclusters out of crafted images properly\n\nsyzbot reported a task hang issue due to a deadlock case where it is\nwaiting for the folio lock of a cached folio that will be used for\ncache I/Os.\n\nAfter looking into the crafted fuzzed image, I found it's formed with\nseveral overlapped big pclusters as below:\n\n Ext: logical offset | length : physical offset | length\n 0: 0.. 16384 | 16384 : 151552.. 167936 | 16384\n 1: 16384.. 32768 | 16384 : 155648.. 172032 | 16384\n 2: 32768.. 49152 | 16384 : 537223168.. 537239552 | 16384\n...\n\nHere, extent 0/1 are physically overlapped although it's entirely\n_impossible_ for normal filesystem images generated by mkfs.\n\nFirst, managed folios containing compressed data will be marked as\nup-to-date and then unlocked immediately (unlike in-place folios) when\ncompressed I/Os are complete. If physical blocks are not submitted in\nthe incremental order, there should be separate BIOs to avoid dependency\nissues. However, the current code mis-arranges z_erofs_fill_bio_vec()\nand BIO submission which causes unexpected BIO waits.\n\nSecond, managed folios will be connected to their own pclusters for\nefficient inter-queries. However, this is somewhat hard to implement\neasily if overlapped big pclusters exist. Again, these only appear in\nfuzzed images so let's simply fall back to temporary short-lived pages\nfor correctness.\n\nAdditionally, it justifies that referenced managed folios cannot be\ntruncated for now and reverts part of commit 2080ca1ed3e4 (\"erofs: tidy\nup `struct z_erofs_bvec`\") for simplicity although it shouldn't be any\ndifference."
}
],
"affected": [
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/erofs/zdata.c"
],
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"status": "affected",
"versionType": "git"
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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},
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"status": "unaffected",
"versionType": "semver"
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{
"version": "6.12",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
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}
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"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.13",
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},
{
"vulnerable": true,
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{
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"references": [
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"url": "https://git.kernel.org/stable/c/c1172e65aad4b115392ea4c6e61e56e5b9b69df4"
},
{
"url": "https://git.kernel.org/stable/c/1bf7e414cac303c9aec1be67872e19be8b64980c"
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{
"url": "https://git.kernel.org/stable/c/b9b30af0e86ffb485301ecd83b9129c9dfb7ebf8"
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"url": "https://git.kernel.org/stable/c/9cfa199bcbbbba31cbf97b2786f44f4464f3f29a"
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{
"url": "https://git.kernel.org/stable/c/9e2f9d34dd12e6e5b244ec488bcebd0c2d566c50"
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"title": "erofs: handle overlapped pclusters out of crafted images properly",
"x_generator": {
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"metrics": [
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"other": {
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"content": {
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"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2024-10-21T12:59:50.164921Z"
}
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],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
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"dateUpdated": "2024-10-21T13:04:15.151Z"
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}
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