{"api_version":"1","generated_at":"2026-04-19T01:10:08+00:00","cve":"CVE-2026-31403","urls":{"html":"https://cve.report/CVE-2026-31403","api":"https://cve.report/api/cve/CVE-2026-31403.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31403","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31403"},"summary":{"title":"NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd\n\nThe /proc/fs/nfs/exports proc entry is created at module init\nand persists for the module's lifetime. exports_proc_open()\ncaptures the caller's current network namespace and stores\nits svc_export_cache in seq->private, but takes no reference\non the namespace. If the namespace is subsequently torn down\n(e.g. container destruction after the opener does setns() to a\ndifferent namespace), nfsd_net_exit() calls nfsd_export_shutdown()\nwhich frees the cache. Subsequent reads on the still-open fd\ndereference the freed cache_detail, walking a freed hash table.\n\nHold a reference on the struct net for the lifetime of the open\nfile descriptor. This prevents nfsd_net_exit() from running --\nand thus prevents nfsd_export_shutdown() from freeing the cache\n-- while any exports fd is open. cache_detail already stores\nits net pointer (cd->net, set by cache_create_net()), so\nexports_release() can retrieve it without additional per-file\nstorage.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-03 16:16:39","updated_at":"2026-04-18 09:16:30"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6","name":"https://git.kernel.org/stable/c/db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e3d77f935639e6ae4b381c80464c31df998d61f4","name":"https://git.kernel.org/stable/c/e3d77f935639e6ae4b381c80464c31df998d61f4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e7fcf179b82d3a3730fd8615da01b087cc654d0b","name":"https://git.kernel.org/stable/c/e7fcf179b82d3a3730fd8615da01b087cc654d0b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c7f406fb341d6747634b8b1fa5461656e5e56076","name":"https://git.kernel.org/stable/c/c7f406fb341d6747634b8b1fa5461656e5e56076","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6a8d70e2ad6aad2c345a5048edcb8168036f97d6","name":"https://git.kernel.org/stable/c/6a8d70e2ad6aad2c345a5048edcb8168036f97d6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d1a19217995df9c7e4118f5a2820c5032fef2945","name":"https://git.kernel.org/stable/c/d1a19217995df9c7e4118f5a2820c5032fef2945","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/76740c28050dc6db2f5550f1325b00a11bbb3255","name":"https://git.kernel.org/stable/c/76740c28050dc6db2f5550f1325b00a11bbb3255","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31403","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31403","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 76740c28050dc6db2f5550f1325b00a11bbb3255 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 c7f406fb341d6747634b8b1fa5461656e5e56076 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 d1a19217995df9c7e4118f5a2820c5032fef2945 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 e3d77f935639e6ae4b381c80464c31df998d61f4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.20 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.10 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31403","cve":"CVE-2026-31403","epss":"0.000320000","percentile":"0.090980000","score_date":"2026-04-18","updated_at":"2026-04-19 00:10:43"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/nfsd/nfsctl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"76740c28050dc6db2f5550f1325b00a11bbb3255","status":"affected","version":"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5","versionType":"git"},{"lessThan":"c7f406fb341d6747634b8b1fa5461656e5e56076","status":"affected","version":"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5","versionType":"git"},{"lessThan":"d1a19217995df9c7e4118f5a2820c5032fef2945","status":"affected","version":"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5","versionType":"git"},{"lessThan":"e3d77f935639e6ae4b381c80464c31df998d61f4","status":"affected","version":"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5","versionType":"git"},{"lessThan":"db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6","status":"affected","version":"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5","versionType":"git"},{"lessThan":"6a8d70e2ad6aad2c345a5048edcb8168036f97d6","status":"affected","version":"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5","versionType":"git"},{"lessThan":"e7fcf179b82d3a3730fd8615da01b087cc654d0b","status":"affected","version":"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/nfsd/nfsctl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.9"},{"lessThan":"3.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.20","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.20","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.10","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"3.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd\n\nThe /proc/fs/nfs/exports proc entry is created at module init\nand persists for the module's lifetime. exports_proc_open()\ncaptures the caller's current network namespace and stores\nits svc_export_cache in seq->private, but takes no reference\non the namespace. If the namespace is subsequently torn down\n(e.g. container destruction after the opener does setns() to a\ndifferent namespace), nfsd_net_exit() calls nfsd_export_shutdown()\nwhich frees the cache. Subsequent reads on the still-open fd\ndereference the freed cache_detail, walking a freed hash table.\n\nHold a reference on the struct net for the lifetime of the open\nfile descriptor. This prevents nfsd_net_exit() from running --\nand thus prevents nfsd_export_shutdown() from freeing the cache\n-- while any exports fd is open. cache_detail already stores\nits net pointer (cd->net, set by cache_create_net()), so\nexports_release() can retrieve it without additional per-file\nstorage."}],"providerMetadata":{"dateUpdated":"2026-04-18T08:59:22.837Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/76740c28050dc6db2f5550f1325b00a11bbb3255"},{"url":"https://git.kernel.org/stable/c/c7f406fb341d6747634b8b1fa5461656e5e56076"},{"url":"https://git.kernel.org/stable/c/d1a19217995df9c7e4118f5a2820c5032fef2945"},{"url":"https://git.kernel.org/stable/c/e3d77f935639e6ae4b381c80464c31df998d61f4"},{"url":"https://git.kernel.org/stable/c/db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6"},{"url":"https://git.kernel.org/stable/c/6a8d70e2ad6aad2c345a5048edcb8168036f97d6"},{"url":"https://git.kernel.org/stable/c/e7fcf179b82d3a3730fd8615da01b087cc654d0b"}],"title":"NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31403","datePublished":"2026-04-03T15:16:06.444Z","dateReserved":"2026-03-09T15:48:24.086Z","dateUpdated":"2026-04-18T08:59:22.837Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-03 16:16:39","lastModifiedDate":"2026-04-18 09:16:30","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31403","Ordinal":"1","Title":"NFSD: Hold net reference for the lifetime of /proc/fs/nfs/export","CVE":"CVE-2026-31403","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31403","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd\n\nThe /proc/fs/nfs/exports proc entry is created at module init\nand persists for the module's lifetime. exports_proc_open()\ncaptures the caller's current network namespace and stores\nits svc_export_cache in seq->private, but takes no reference\non the namespace. If the namespace is subsequently torn down\n(e.g. container destruction after the opener does setns() to a\ndifferent namespace), nfsd_net_exit() calls nfsd_export_shutdown()\nwhich frees the cache. Subsequent reads on the still-open fd\ndereference the freed cache_detail, walking a freed hash table.\n\nHold a reference on the struct net for the lifetime of the open\nfile descriptor. This prevents nfsd_net_exit() from running --\nand thus prevents nfsd_export_shutdown() from freeing the cache\n-- while any exports fd is open. cache_detail already stores\nits net pointer (cd->net, set by cache_create_net()), so\nexports_release() can retrieve it without additional per-file\nstorage.","Type":"Description","Title":"NFSD: Hold net reference for the lifetime of /proc/fs/nfs/export"}]}}}