CVE-2026-31403 (GCVE-0-2026-31403)
Vulnerability from cvelistv5
Published
2026-04-03 15:16
Modified
2026-10-19 18:35
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5
Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5
Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5
Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5
Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5
Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5
Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5
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Following the higher-severity rule for UAFs, integrity impact is High.\\nA:H - Reading the stale fd dereferences freed kernel memory and can oops or panic the kernel. 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  }
}


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