CVE-2021-28951: Fedoraproject Fedora

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• Linux Linux Kernel: up to and including 5.11.8
• Netapp a250 Firmware: affected versions not specified
• Netapp Aff 500f Firmware: affected versions not specified
• Netapp Cloud Backup: affected versions not specified
• Netapp Fas 500f Firmware: affected versions not specified
• Netapp Solidfire Baseboard Management Controller Firmware: affected versions not specified

Published 2021-03-20. Last modified 2026-06-17.