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Severity
Medium
Analysis Summary
An error within the “nfsd4_verify_copy()” function (fs/nfsd/nfs4proc.c) can be exploited to trigger a NULL pointer deference and subsequently crash the NFS server.
Impact
Denial of Service
Affected Vendors
Linux
Affected Products
- Linux Kernel 4.9.x
- Linux Kernel 4.14.x
- Linux Kernel 4.19.x
Remediation
Update to a fixed version.
Versions 4.19.x:
Update to version 4.19.3 or later.
Versions 4.14.x:
Update to version 4.14.82 or later.
Versions 4.9.x:
Update to version 4.9.138 or later.