CVE-2021-38199

MEDIUM
6.5
CVSS Score
Published: August 8, 2021 at 07:27 PM UTC
Updated: October 8, 2026 at 09:17 PM UTC
6 products affected across 3 vendorsLinux KernelDebian LinuxSolidfire· also runs on 2 platforms

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 5.13.4*
Affected range stops below 5.13.4, so it looks safe — our inference, not a vendor statement
-
netapp-hci-storage-node (environment)
-
netapp-hci-compute-node (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (6)

x_refsource_MISCMailing ListPatchVendor Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
Mailing Listx_refsource_MLISTThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
Mailing Listx_refsource_MLISTThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
https://www.debian.org/security/2021/dsa-4978

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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