Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before 76740c28050dc6db2f5550f1325b00a11bbb3255; affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before c7f406fb341d6747634b8b1fa5461656e5e56076; affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before d1a19217995df9c7e4118f5a2820c5032fef2945; affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before e3d77f935639e6ae4b381c80464c31df998d61f4; affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6; affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before 6a8d70e2ad6aad2c345a5048edcb8168036f97d6; affected 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before e7fcf179b82d3a3730fd8615da01b087cc654d0b |
| Linux / Linux | affected 3.9; unaffected 0 before 3.9; unaffected 5.10.253 through 5.10.*; unaffected 6.1.167 through 6.1.*; unaffected 6.6.130 through 6.6.*; unaffected 6.12.78 through 6.12.*; unaffected 6.18.20 through 6.18.*; unaffected 6.19.10 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/76740c28050dc6db2f5550f1325b00a11bbb3255
- https://git.kernel.org/stable/c/c7f406fb341d6747634b8b1fa5461656e5e56076
- https://git.kernel.org/stable/c/d1a19217995df9c7e4118f5a2820c5032fef2945
- https://git.kernel.org/stable/c/e3d77f935639e6ae4b381c80464c31df998d61f4
- https://git.kernel.org/stable/c/db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6
- https://git.kernel.org/stable/c/6a8d70e2ad6aad2c345a5048edcb8168036f97d6
- https://git.kernel.org/stable/c/e7fcf179b82d3a3730fd8615da01b087cc654d0b
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.