CVE-2020-10761 Denial of service in QEMU:

What is CVE-2020-10761?

CVE-2020-10761 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 9 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An assertion failure issue was found in the Network Block Device(NBD) Server in all QEMU versions before QEMU 5.0.1. This flaw occurs when an nbd-client sends a spec-compliant request that is near the boundary of maximum permitted request length. A remote nbd-client could use this flaw to crash the qemu-nbd server resulting in a denial of service.

Weakness: CWE-617

Which versions are affected by CVE-2020-10761?

It affects 4 products.

Products include Canonical Ubuntu Linux, Opensuse Leap, Qemu Qemu, Redhat Enterprise Linux.

How do I fix CVE-2020-10761?

Upgrade to a fixed version.

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-2020-10761 being exploited?

There is no known exploitation of CVE-2020-10761 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2020-10761, GHSA-qm9j-3g67-35f8, UBUNTU-CVE-2020-10761.