{"api_version":"1","generated_at":"2026-06-18T09:11:08+00:00","cve":"CVE-2026-45983","urls":{"html":"https://cve.report/CVE-2026-45983","api":"https://cve.report/api/cve/CVE-2026-45983.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-45983","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45983"},"summary":{"title":"nfsd: never defer requests during idmap lookup","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: never defer requests during idmap lookup\n\nDuring v4 request compound arg decoding, some ops (e.g. SETATTR)\ncan trigger idmap lookup upcalls. When those upcall responses get\ndelayed beyond the allowed time limit, cache_check() will mark the\nrequest for deferral and cause it to be dropped.\n\nThis prevents nfs4svc_encode_compoundres from being executed, and\nthus the session slot flag NFSD4_SLOT_INUSE never gets cleared.\nSubsequent client requests will fail with NFSERR_JUKEBOX, given\nthat the slot will be marked as in-use, making the SEQUENCE op\nfail.\n\nFix this by making sure that the RQ_USEDEFERRAL flag is always\nclear during nfs4svc_decode_compoundargs(), since no v4 request\nshould ever be deferred.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:15","updated_at":"2026-06-16 02:39:11"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93","name":"https://git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23","name":"https://git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9","name":"https://git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd","name":"https://git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4","name":"https://git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb","name":"https://git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593","name":"https://git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826","name":"https://git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45983","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45983","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f425878b6a71571341dcd3f9e9d1a6f6355da9c b9abb760db20504240a7147f27934d900cd80b23 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f425878b6a71571341dcd3f9e9d1a6f6355da9c 3a72c7dedc99b321e0f267e4e999e5baf07c4593 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f425878b6a71571341dcd3f9e9d1a6f6355da9c 99e17b20fddac19a228d213e00f6b9e1c10daff9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f425878b6a71571341dcd3f9e9d1a6f6355da9c 243f71ed873ff3feeb6f9b5cb145d63f7188b4c4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: never defer requests during idmap lookup\n\nDuring v4 request compound arg decoding, some ops (e.g. SETATTR)\ncan trigger idmap lookup upcalls. 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When those upcall responses get\ndelayed beyond the allowed time limit, cache_check() will mark the\nrequest for deferral and cause it to be dropped.\n\nThis prevents nfs4svc_encode_compoundres from being executed, and\nthus the session slot flag NFSD4_SLOT_INUSE never gets cleared.\nSubsequent client requests will fail with NFSERR_JUKEBOX, given\nthat the slot will be marked as in-use, making the SEQUENCE op\nfail.\n\nFix this by making sure that the RQ_USEDEFERRAL flag is always\nclear during nfs4svc_decode_compoundargs(), since no v4 request\nshould ever be deferred.","Type":"Description","Title":"nfsd: never defer requests during idmap lookup"}]}}}