138 lines
8.0 KiB
JSON
138 lines
8.0 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-2026-53396",
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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": "2026-06-09T07:44:35.402Z",
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"datePublished": "2026-07-19T12:01:58.375Z",
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"dateUpdated": "2026-08-17T04:50:48.148Z"
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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": "2026-08-17T04:50:48.148Z"
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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\nnfsd: fix posix_acl leak and ignored error in nfsd4_create_file\n\nnfsd4_create_file() has two bugs in its ACL handling:\n\nThe return value of nfsd4_acl_to_attr() is silently discarded. When\nthe NFSv4-to-POSIX ACL conversion fails (e.g., -EINVAL for\nunsupported ACE types), the file is created without any ACL and the\nclient receives NFS4_OK. This violates RFC 7530/8881 which require\nthe server to reject unsupported attributes on CREATE.\n\nWhen start_creating() fails after ACL attributes have been populated\nin attrs (either via nfsd4_acl_to_attr or via ownership transfer from\nopen->op_dpacl/op_pacl), the function jumps to out_write which skips\nnfsd_attrs_free(). The posix_acl allocations are leaked. A client\ncan trigger this repeatedly with OPEN(CREATE), ACL attributes, and an\ninvalid filename (e.g., longer than NAME_MAX).\n\nFix both by capturing the nfsd4_acl_to_attr() return value and by\nchanging the early error paths to jump to out instead of out_write.\nInitialize child to ERR_PTR(-EINVAL) so that end_creating() is safe\nto call even if start_creating() was never reached."
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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:L/UI:N/S:U/C:N/I:L/A:H",
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"baseScore": 7.1,
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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 - The vulnerable code is reached via NFSv4 OPEN(CREATE) handled by nfsd over the network (RPC on TCP/2049), from nfsd4_proc_compound() through nfsd4_open() and do_open_lookup() into nfsd4_create_file().\nAC:L - An authenticated NFS client can reliably trigger the leak by sending OPEN(CREATE) with ACL attributes and a filename that causes start_creating() to fail (e.g., longer than the backing filesystem NAME_MAX); no race or attacker-uncontrollable conditions are required.\nPR:L - Exploitation requires an authenticated NFS client with write/create permission on the target export directory (enforced by fh_verify()/nfsd_permission), which maps to basic authorized-user access rather than unauthenticated or server-admin privileges.\nUI:N - No victim interaction is needed beyond the attacker sending crafted NFSv4 compound requests to the server.\nS:U - Impact is confined to kernel memory management and exported file metadata within the NFS server's security authority; it does not cross VM, container, or IOMMU boundaries.\nC:N - The bug is a refcount leak of posix_acl kernel objects with no out-of-bounds read, use-after-free, or other mechanism that exposes kernel memory to the attacker.\nI:L - The ignored nfsd4_acl_to_attr() error allows files to be created without the requested ACL while returning NFS4_OK, causing limited but incorrect modification of exported file security attributes on shared storage.\nA:H - Repeated triggering leaks unbounded posix_acl slab objects per request, enabling sustained kernel memory exhaustion that can deny NFS service and degrade overall system availability."
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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/nfsd/nfs4proc.c"
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],
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"versions": [
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{
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"version": "7ab96df840e60eb933abfe65fc5fe44e72f16dc0",
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"lessThan": "18cf006a08babec0bbac2a3784f8f28e56e47490",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7ab96df840e60eb933abfe65fc5fe44e72f16dc0",
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"lessThan": "24c975bbdd564d7d0ad90294bfa69729830345de",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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/nfsd/nfs4proc.c"
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],
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"versions": [
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{
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"version": "6.19",
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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": "6.19",
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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": "7.1.3",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.1.3"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/18cf006a08babec0bbac2a3784f8f28e56e47490"
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},
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{
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"url": "https://git.kernel.org/stable/c/24c975bbdd564d7d0ad90294bfa69729830345de"
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}
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],
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"title": "nfsd: fix posix_acl leak and ignored error in nfsd4_create_file",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |