CVE-2021-20316 Race condition in samba

What is CVE-2021-20316?

CVE-2021-20316 is a medium-severity vulnerability in Debian Debian Linux, published on 23 Aug 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A flaw was found in the way Samba handled file/directory metadata. This flaw allows an authenticated attacker with permissions to read or modify share metadata, to perform this operation outside of the share.

Weakness: CWE-362

Which versions are affected by CVE-2021-20316?

It affects 7 products.

Products include Debian Debian Linux, Redhat Enterprise Linux, Redhat Enterprise Linux Aus, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Tus, Redhat Virtualization Host and 1 more.

How do I fix CVE-2021-20316?

Apply the vendor's patch.

Is CVE-2021-20316 being exploited?

There is no known exploitation of CVE-2021-20316 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

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• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as AZL-10652, AZL-37001, DEBIAN-CVE-2021-20316, ECHO-4d1b-025a-dc40, GHSA-88fw-cm3w-8cq5, UBUNTU-CVE-2021-20316.