CVE-2021-28951 Denial of service in n/a

What is CVE-2021-28951?

CVE-2021-28951 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 20 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.

Weakness: CWE-667

Which versions are affected by CVE-2021-28951?

It affects 7 products.

Products include Fedoraproject Fedora, Linux kernel, Netapp A250 Firmware, Netapp Aff 500f Firmware, Netapp Cloud Backup, Netapp Fas 500f Firmware and 1 more.

How do I fix CVE-2021-28951?

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-2021-28951 being exploited?

There is no known exploitation of CVE-2021-28951 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as AZL-6539, DEBIAN-CVE-2021-28951, GHSA-q9qq-7xqr-6gxf, UBUNTU-CVE-2021-28951.