CVE-2021-38199

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 3.1

6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

1.2% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-25)

Published

2021-08-08

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• debian:debian_linux
• linux:linux_kernel
• netapp:element_software
• netapp:hci_bootstrap_os
• netapp:hci_management_node
• netapp:solidfire

References

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
• https://github.com/torvalds/linux/commit/dd99e9f98fbf423ff6d365b37a98e8879170f17c
• https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
• https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
• https://security.netapp.com/advisory/ntap-20210902-0010/

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