CVE-2021-20286

libnbd: Assertion failure in nbd_unlocked_opt_go in lib/opt.c

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Severity

Low

Red Hat Product Security

2.7

CVSS 3.1

Review impact separately from score.

Published · March 1, 2021

Updated · June 28, 2026

Description

A flaw was found in libnbd. A malicious server may be able to kill a client application using libnbd due to an assertion failure in nbd_unlocked_opt_go() leading to denial of service. The highest threat from this vulnerability is to system availability.

Statement

Red Hat Enterprise Linux 8 is not affected by this issue. The affected API was introduced in upstream libnbd version 1.4 which is only shipped in RHEL Advanced Virtualization 8.3.0 onward.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 2.7
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

CWE-617 · Reachable Assertion