138 lines
7.5 KiB
JSON
138 lines
7.5 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-2026-53395",
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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": "2026-07-19T12:01:57.816Z",
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"dateUpdated": "2026-08-17T04:50:47.054Z"
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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": "2026-08-17T04:50:47.054Z"
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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 dead ACL conflict guard in nfsd4_create\n\nnfsd4_create() steals create->cr_dpacl/cr_pacl into the local\nnfsd_attrs via the designated initializer, then immediately sets the\nsource pointers to NULL. The subsequent conflict guard tests the\nalready-nilled source fields, making it permanently dead code:\n\n if (create->cr_acl) {\n if (create->cr_dpacl || create->cr_pacl) /* always false */\n\nWhen a client encodes both FATTR4_WORD0_ACL and\nFATTR4_WORD2_POSIX_{DEFAULT,ACCESS}_ACL in the same CREATE fattr\nbitmap, nfsd4_acl_to_attr() overwrites attrs.na_pacl/na_dpacl without\nreleasing the originals, leaking two posix_acl slab objects per\nrequest. Repeated requests cause unbounded slab exhaustion.\n\nFix by checking attrs.na_dpacl/na_pacl (the stolen values) instead of\nthe nilled create->cr_dpacl/cr_pacl, matching the correct pattern\nalready used in nfsd4_setattr()."
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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 - The vulnerability is reached through the in-kernel NFS server (nfsd) processing remotely submitted NFSv4 COMPOUND requests containing OP_CREATE over the network (TCP/2049).\nAC:L - An attacker can reliably trigger the leak by sending CREATE operations with both FATTR4_WORD0_ACL and FATTR4_WORD2_POSIX_DEFAULT/ACCESS_ACL set in the fattr bitmap; no race or uncontrollable conditions are required.\nPR:N - Exploitation requires only network reachability to nfsd and standard NFSv4 client authentication to an export; no elevated Linux privileges on the server are needed beyond being an authorized NFS client.\nUI:N - The leak is triggered entirely by crafted NFS protocol requests with no action required from a human user on the server.\nS:U - Impact is confined to kernel memory exhaustion on the NFS server; it does not cross a security boundary such as a VM or sandbox escape.\nC:N - The bug causes reference leaks of posix_acl slab objects only; there is no out-of-bounds access, use-after-free, or other memory corruption that could disclose data.\nI:N - No data modification or memory corruption occurs; the only effect is unreleased kernel heap allocations.\nA:H - Each malicious CREATE leaks two posix_acl slab objects, and repeated requests cause unbounded slab exhaustion that can render the NFS server and potentially the entire host unavailable through OOM conditions."
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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": "d2ca50606f5f0235d7780c1cd73b6614a5d07620",
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"lessThan": "8371cc5c0a2cc2a71b3dcfd47ff1f7fcfc526a5e",
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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": "d2ca50606f5f0235d7780c1cd73b6614a5d07620",
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"lessThan": "a60f25a800846ab8e5a13f8a9d05111f2aee55a7",
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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": "7.0",
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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": "7.0",
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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": "7.0",
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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": "7.0",
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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/8371cc5c0a2cc2a71b3dcfd47ff1f7fcfc526a5e"
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},
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{
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"url": "https://git.kernel.org/stable/c/a60f25a800846ab8e5a13f8a9d05111f2aee55a7"
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}
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],
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"title": "nfsd: fix dead ACL conflict guard in nfsd4_create",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |