CVE-2021-46952: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds
First published: Tue Feb 27 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused by a garbage timeout (retrans) mount option being passed to nfs mount, in this case from syzkaller. If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift value for a 64-bit long integer, so 'retrans' cannot be >= 64. If it is >= 64, fail the mount and return an error.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.6.0<5.10.36 | |
| Linux Linux kernel | >=5.11.0<5.11.20 | |
| Linux Linux kernel | >=5.12.0<5.12.3 |
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