Description

A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory or possibly have unspecified other impact because a size check is in fs/nfs/nfs4proc.c instead of fs/nfs/nfs4xdr.c, aka CID-b4487b935452.

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.3

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4487b93545214a9db8cbf32e86411677b0cca21

https://twitter.com/grsecurity/status/1303370421958578179

https://usn.ubuntu.com/4527-1/

https://usn.ubuntu.com/4525-1/

https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html

https://usn.ubuntu.com/4578-1/

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html

https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html

https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html

Details

Risk Information

CVSS v2

CVSS v3