138 lines
8.2 KiB
JSON
138 lines
8.2 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-2025-71090",
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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": "2026-01-13T15:30:19.649Z",
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"datePublished": "2026-01-13T15:34:51.777Z",
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"dateUpdated": "2026-08-05T12:11:59.817Z"
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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": "2026-08-05T12:11:59.817Z"
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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 nfsd_file reference leak in nfsd4_add_rdaccess_to_wrdeleg()\n\nnfsd4_add_rdaccess_to_wrdeleg() unconditionally overwrites\nfp->fi_fds[O_RDONLY] with a newly acquired nfsd_file. However, if\nthe client already has a SHARE_ACCESS_READ open from a previous OPEN\noperation, this action overwrites the existing pointer without\nreleasing its reference, orphaning the previous reference.\n\nAdditionally, the function originally stored the same nfsd_file\npointer in both fp->fi_fds[O_RDONLY] and fp->fi_rdeleg_file with\nonly a single reference. When put_deleg_file() runs, it clears\nfi_rdeleg_file and calls nfs4_file_put_access() to release the file.\n\nHowever, nfs4_file_put_access() only releases fi_fds[O_RDONLY] when\nthe fi_access[O_RDONLY] counter drops to zero. If another READ open\nexists on the file, the counter remains elevated and the nfsd_file\nreference from the delegation is never released. This potentially\ncauses open conflicts on that file.\n\nThen, on server shutdown, these leaks cause __nfsd_file_cache_purge()\nto encounter files with an elevated reference count that cannot be\ncleaned up, ultimately triggering a BUG() in kmem_cache_destroy()\nbecause there are still nfsd_file objects allocated in that cache."
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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 vulnerable path processes remotely supplied NFSv4.1 COMPOUND OPEN requests through the kernel NFS server. An attacker can trigger it over the network against an exposed NFS export.\nAC:L - The attacker can deterministically retain a READ open using WANT_NO_DELEG and then request an uncontended WRITE-only open that receives a write delegation. No race or condition outside the attacker's control is required.\nPR:N - A permissive read-write export using AUTH_SYS or AUTH_NULL can allow an unauthenticated client to establish a session and open an anonymous or world-accessible file. No pre-existing target-system privileges are required in this reasonable deployment.\nUI:N - The malicious client alone can issue the OPEN, DELEGRETURN, and CLOSE operations needed to create repeatable leaks. No victim user action is required.\nS:U - The leak and resulting denial of service remain within the NFS server and host kernel security authority. No virtualization, sandbox, or other security boundary is crossed.\nC:N - The bug retains valid nfsd_file objects and does not free, over-read, or expose their contents. It provides no memory-disclosure primitive.\nI:N - The overwritten pointer causes an orphaned reference rather than a dangling pointer or memory corruption. It provides no arbitrary write, control-flow hijack, or data-modification primitive.\nA:H - The leak can be repeated across attacker-accessible files, retaining file-cache objects and causing resource exhaustion or open conflicts. During final nfsd cache teardown, the remaining objects trigger the slab BUG/WARN path and can panic systems configured to treat warnings as fatal."
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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/nfs4state.c"
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],
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"versions": [
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{
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"version": "e7a8ebc305f26cab608e59a916a4ae89d6656c5f",
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"lessThan": "c07dc84ed67c5a182273171639bacbbb87c12175",
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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": "e7a8ebc305f26cab608e59a916a4ae89d6656c5f",
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"lessThan": "8072e34e1387d03102b788677d491e2bcceef6f5",
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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/nfs4state.c"
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],
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"versions": [
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{
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"version": "6.17",
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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": "6.17",
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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": "6.18.4",
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"lessThanOrEqual": "6.18.*",
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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": "6.19",
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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": "6.17",
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"versionEndExcluding": "6.18.4"
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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": "6.17",
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"versionEndExcluding": "6.19"
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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/c07dc84ed67c5a182273171639bacbbb87c12175"
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},
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{
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"url": "https://git.kernel.org/stable/c/8072e34e1387d03102b788677d491e2bcceef6f5"
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}
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],
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"title": "nfsd: fix nfsd_file reference leak in nfsd4_add_rdaccess_to_wrdeleg()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |