cbcvebase.
CVE-2026-31403
published 2026-04-03

CVE-2026-31403: In the Linux kernel, the following vulnerability has been resolved: NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd The…

PriorityP339high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.13%
2.6th percentile
In the Linux kernel, the following vulnerability has been resolved: NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd The /proc/fs/nfs/exports proc entry is created at module init and persists for the module's lifetime. exports_proc_open() captures the caller's current network namespace and stores its svc_export_cache in seq->private, but takes no reference on the namespace. If the namespace is subsequently torn down (e.g. container destruction after the opener does setns() to a different namespace), nfsd_net_exit() calls nfsd_export_shutdown() which frees the cache. Subsequent reads on the still-open fd dereference the freed cache_detail, walking a freed hash table. Hold a reference on the struct net for the lifetime of the open file descriptor. This prevents nfsd_net_exit() from running -- and thus prevents nfsd_export_shutdown() from freeing the cache -- while any exports fd is open. cache_detail already stores its net pointer (cd->net, set by cache_create_net()), so exports_release() can retrieve it without additional per-file storage.

Affected

43 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.19.10-1 (forky)linux 6.19.10-1 (forky)
linuxlinux
linuxlinux>= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < 76740c28050dc6db2f5550f1325b00a11bbb325576740c28050dc6db2f5550f1325b00a11bbb3255
linuxlinux>= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < c7f406fb341d6747634b8b1fa5461656e5e56076c7f406fb341d6747634b8b1fa5461656e5e56076
linuxlinux>= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < d1a19217995df9c7e4118f5a2820c5032fef2945d1a19217995df9c7e4118f5a2820c5032fef2945
linuxlinux>= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < e3d77f935639e6ae4b381c80464c31df998d61f4e3d77f935639e6ae4b381c80464c31df998d61f4
linuxlinux>= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6
linuxlinux>= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < 6a8d70e2ad6aad2c345a5048edcb8168036f97d66a8d70e2ad6aad2c345a5048edcb8168036f97d6
linuxlinux>= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < e7fcf179b82d3a3730fd8615da01b087cc654d0be7fcf179b82d3a3730fd8615da01b087cc654d0b
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.19.10-16.19.10-1
linuxlinux_kernel>= 3.9 < 5.10.2535.10.253
linuxlinux_kernel>= 5.11 < 6.1.1676.1.167
linuxlinux_kernel>= 6.13 < 6.18.206.18.20
linuxlinux_kernel>= 6.19 < 6.19.106.19.10
linuxlinux_kernel>= 6.2 < 6.6.1306.6.130
linuxlinux_kernel>= 6.7 < 6.12.786.12.78
ubuntulinux
ubuntulinux-aws
ubuntulinux-azure
ubuntulinux-azure-6.8
ubuntulinux-azure-fde

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_redhat5.5MEDIUM
vendor_ubuntu2.0LOW
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