CVE-2021-3178

MEDIUM

Linux Kernel < 5.10.8 - Path Traversal via NFS READDIRPLUS

Title source: llm

Description

fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior

References (4)

Core 4

Core References

Various Sources x_refsource_misc

https://patchwork.kernel.org/project/linux-nfs/patch/20210111210129.GA11652%40fieldses.org/

Mailing List, Patch, Vendor Advisory x_refsource_misc

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=51b2ee7d006a736a9126e8111d1f24e4fd0afaa6

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5SGB7TNDVQEOJ7NVTGX56UWHDNQM5TRC/

Mailing List, Third Party Advisory mailing-list x_refsource_mlist

https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html

Scores

CVSS v3 6.5

EPSS 0.0242

EPSS Percentile 82.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Details

CWE

CWE-22

Status published

Products (3)

debian/debian_linux 9.0

fedoraproject/fedora 33

linux/linux_kernel < 5.10.8

Published Jan 19, 2021

Tracked Since Feb 18, 2026