Reachable Assertion in libnbd - CVE-2021-20286
Published: November 10, 2023
Vulnerability identifier: #VU82991
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-20286
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion within the nbd_unlocked_opt_go() function in ilb/opt.c. A remote attacker can send specially crafted input to the application and perform a denial of service (DoS) attack.
Affected software
libnbd
SUSE Linux Enterprise Module for Containers
kubevirt-virtctl
kubevirt-virtctl-debuginfo
SUSE Linux Enterprise Module for Containers
kubevirt-virtctl
kubevirt-virtctl-debuginfo
How to mitigate CVE-2021-20286
Install updates from vendor's website.
libnbd - update to 1.7.3
kubevirt-virtctl - update to 0.40.0-5.11.2
kubevirt-virtctl-debuginfo - update to 0.40.0-5.11.2
kubevirt-virtctl - update to 0.40.0-5.11.2
kubevirt-virtctl-debuginfo - update to 0.40.0-5.11.2