240 lines
11 KiB
JSON
240 lines
11 KiB
JSON
{
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"cveId": "CVE-2021-47316",
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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": "2024-05-21T14:28:16.973Z",
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"datePublished": "2024-05-21T14:35:32.564Z",
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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\nnfsd: fix NULL dereference in nfs3svc_encode_getaclres\n\nIn error cases the dentry may be NULL.\n\nBefore 20798dfe249a, the encoder also checked dentry and\nd_really_is_positive(dentry), but that looks like overkill to me--zero\nstatus should be enough to guarantee a positive dentry.\n\nThis isn't the first time we've seen an error-case NULL dereference\nhidden in the initialization of a local variable in an xdr encoder. But\nI went back through the other recent rewrites and didn't spot any\nsimilar bugs."
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"value": "AV:N - The bug is in nfsd's NFSv3 ACL program (NFS_ACL_PROGRAM) GETACL result encoder, reached by sending RPC requests over the network to the in-kernel NFS server (TCP/UDP, typically port 2049).\nAC:L - An attacker reliably triggers the crash by sending a GETACL with a malformed or invalid filehandle so fh_verify fails and fh_dentry stays NULL; no race or attacker-uncontrollable condition is required.\nPR:N - The path is reachable with AUTH_NULL or forgeable AUTH_UNIX after only IP-based export matching, before any meaningful credential verification or valid filehandle access, matching other nfsd pre-auth/network DoS scores.\nUI:N - Exploitation requires only attacker-sent NFSACL GETACL RPCs; no victim user action is needed.\nS:U - Impact is confined to the NFS server host kernel; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:N - This is a pure NULL pointer dereference of dentry->d_inode with no out-of-bounds read, UAF, or other information-disclosure primitive.\nI:N - The bug only crashes on NULL dereference in the encoder; it does not corrupt memory or provide a write/code-execution primitive.\nA:H - d_inode(NULL) causes a kernel oops/panic in nfsd, fully disrupting the NFS server and host availability, and can be repeated at will."
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"fs/nfsd/nfs3acl.c"
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"lessThanOrEqual": "5.13.*",
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"version": "5.14",
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"versionType": "original_commit_for_fix"
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