CVE-2023-5871 Libnbd: malicious nbd server may crash libnbd

What is CVE-2023-5871?

CVE-2023-5871 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 27 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A flaw was found in libnbd, due to a malicious Network Block Device (NBD), a protocol for accessing Block Devices such as hard disks over a Network. This issue may allow a malicious NBD server to cause a Denial of Service.

Weakness: CWE-617

Which versions are affected by CVE-2023-5871?

It affects 2 products.

Products include Redhat Enterprise Linux, Redhat Libnbd.

How do I fix CVE-2023-5871?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-5871 being exploited?

There is no known exploitation of CVE-2023-5871 in the wild and no public exploit code.

Other vulnerabilities in Redhat Enterprise Linux

• CVE-2018-14667 Red Hat JBoss RichFaces Framework Expression Language Injection Exploited Critical 9.8
• CVE-2021-20325 Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit Critical 9.8
• CVE-2018-25011 Memory corruption in libwebp Critical 9.8
• CVE-2018-25014 Other in libwebp Critical 9.8
• CVE-2014-3585 Supply chain in redhat-upgrade-tool Critical 9.8

All Redhat Enterprise Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2023-5871, GHSA-m8ch-v4g3-cq3g, SUSE-SU-2023:4463-1, UBUNTU-CVE-2023-5871, openSUSE-SU-2024:13422-1.