Medium 6.5Published Aug 8, 2021

CVE-2021-38199fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arran…

Updated under an hour ago (Oct 27, 2026, 1:50 PM ET)

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Exploited in the last 30 days

fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arranging for those servers to be unreachable during trunking detection.

CVSS: 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Modified
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

linux linux_kernel linux:linux_kernel	before 5.13.4	NVD
netapp hci_bootstrap_os netapp:hci_bootstrap_os	all versions	NVD
netapp hci_management_node netapp:hci_management_node	all versions	NVD
netapp solidfire netapp:solidfire	all versions	NVD
netapp element_software netapp:element_software	all versions	NVD
debian debian_linux debian:debian_linux	9.0; 11.0	NVD

References

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4	x-refsource-misc
https://github.com/torvalds/linux/commit/dd99e9f98fbf423ff6d365b37a98e8879170f17c	x-refsource-misc
https://security.netapp.com/advisory/ntap-20210902-0010/	x-refsource-confirm
https://www.debian.org/security/2021/dsa-4978	vendor-advisory, x-refsource-debian
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html	mailing-list, x-refsource-mlist
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html	mailing-list, x-refsource-mlist

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.