323 lines
16 KiB
JSON
323 lines
16 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-2021-47179",
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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": "2024-03-25T09:12:14.112Z",
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"datePublished": "2024-03-25T09:16:28.787Z",
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"dateUpdated": "2026-08-05T08:46:31.594Z"
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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": "2026-08-05T08:46:31.594Z"
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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\nNFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()\n\nCommit de144ff4234f changes _pnfs_return_layout() to call\npnfs_mark_matching_lsegs_return() passing NULL as the struct\npnfs_layout_range argument. Unfortunately,\npnfs_mark_matching_lsegs_return() doesn't check if we have a value here\nbefore dereferencing it, causing an oops.\n\nI'm able to hit this crash consistently when running connectathon basic\ntests on NFS v4.1/v4.2 against Ontap."
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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:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - This is NFSv4/pNFS client code reached while handling layout return after interaction with a remote pNFS MDS/DS peer; a malicious or compromised server can drive the return path (e.g., block/scsi layout I/O errors with PNFS_LAYOUTRET_ON_ERROR, or ordinary layout lifecycle on an active mount).\nAC:L - The crash is a deterministic NULL dereference of the missing layout-range argument and was reported as consistently reproducible on NFSv4.1/4.2 pNFS workloads; the attacker can reliably force layout return once layouts exist.\nPR:N - The attacker can be the remote NFS/pNFS server and needs no privileges on the victim client; client-local credentials are not required for the server-driven trigger.\nUI:N - In a realistic deployment the client already has an active pNFS mount (fstab/automount/infrastructure storage), so exploitation does not require a separate victim action beyond normal use of that mount.\nS:U - Impact is limited to the client kernel/NFS client security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The bug is a pure NULL pointer dereference of return_range with no out-of-bounds read or other information-disclosure primitive.\nI:N - There is no memory write, type confusion, or corruption path—only a NULL dereference—so integrity is unaffected.\nA:H - Dereferencing the NULL layout-range pointer causes a kernel oops/panic in pnfs_mark_matching_lsegs_return(), which is a high availability impact."
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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/nfs/pnfs.c"
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],
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"versions": [
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{
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"version": "80e34f4957ec3010c85f9bb0b568a8d46acdf535",
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"lessThan": "4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42",
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"status": "affected",
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},
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"version": "7b7b9774643220e53eef58c15bb29bd4182fe053",
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"lessThan": "42637ca25c7d7b5a92804a679af5192e8c1a9f48",
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"status": "affected",
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"lessThan": "f9890652185b72b8de9ebeb4406037640b6e1b53",
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"status": "affected",
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"version": "de144ff4234f935bd2150108019b5d87a90a8a96",
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{
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"version": "5.11.20",
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"lessThan": "5.12",
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"status": "affected",
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}
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{
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"product": "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/nfs/pnfs.c"
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],
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"version": "4.9.269",
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"lessThan": "4.9.271",
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"version": "4.14.233",
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"lessThan": "4.14.235",
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"version": "4.19.191",
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"version": "5.12.3",
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"title": "NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()",
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{
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