vulnerability
Amazon Linux AMI 2: CVE-2021-28951: Security patch for kernel (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:N/C:N/I:N/A:C) | Mar 20, 2021 | Apr 18, 2023 | May 20, 2026 |
Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
Mar 20, 2021
Added
Apr 18, 2023
Modified
May 20, 2026
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.
Solutions
amazon-linux-ami-2-upgrade-bpftoolamazon-linux-ami-2-upgrade-bpftool-debuginfoamazon-linux-ami-2-upgrade-kernelamazon-linux-ami-2-upgrade-kernel-debuginfoamazon-linux-ami-2-upgrade-kernel-debuginfo-common-aarch64amazon-linux-ami-2-upgrade-kernel-debuginfo-common-x86_64amazon-linux-ami-2-upgrade-kernel-develamazon-linux-ami-2-upgrade-kernel-headersamazon-linux-ami-2-upgrade-kernel-livepatch-5-15-43-20-103amazon-linux-ami-2-upgrade-kernel-toolsamazon-linux-ami-2-upgrade-kernel-tools-debuginfoamazon-linux-ami-2-upgrade-kernel-tools-develamazon-linux-ami-2-upgrade-perfamazon-linux-ami-2-upgrade-perf-debuginfoamazon-linux-ami-2-upgrade-python-perfamazon-linux-ami-2-upgrade-python-perf-debuginfo
References
- AMAZON-AL2/ALAS2KERNEL-5.10-2023-030
- AMAZON-AL2/ALAS2KERNEL-5.10-2024-058
- AMAZON-AL2/ALAS2KERNEL-5.15-2023-023
- AMAZON-AL2/ALASKERNEL-5.10-2023-030
- AMAZON-AL2/ALASKERNEL-5.10-2024-058
- AMAZON-AL2/ALASKERNEL-5.15-2023-023
- CVE-2021-28951
- https://attackerkb.com/topics/CVE-2021-28951
- CWE-667
- EUVD-EUVD-2021-15602
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-15602
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.