What’s Vulnerable › Vulnerabilities

CVE-2021-38199

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-08 · updated 2026-10-08

Description

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.

Affected products

• Debian Linux: 9.0, 11.0
• Linux kernel: before 5.13.4 — fixed in 5.13.4
• NetApp Element Software: all versions
• NetApp Hci Bootstrap Os: all versions
• NetApp Hci Management Node: all versions
• NetApp Solidfire: all versions

How to fix

Upgrade to a fixed version: Linux kernel 5.13.4. Check the vendor advisory for mitigations.

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/
• https://www.debian.org/security/2021/dsa-4978
• 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/
• https://www.debian.org/security/2021/dsa-4978

Get alerted when CVE-2021-38199 or the next vulnerability affects your stack