What’s Vulnerable › Vulnerabilities
CVE-2021-3669
- Severity: medium (CVSS 5.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2022-08-26 · updated 2026-06-17
- Weakness: CWE-400
Description
A flaw was found in the Linux kernel. Measuring usage of the shared memory does not scale with large shared memory segment counts which could lead to resource exhaustion and DoS.
Affected products
- Debian Linux: 10.0, 11.0
- Fedoraproject Fedora: 34
- IBM Spectrum Copy Data Management: from 2.2.0.0 through 2.2.15.0
- IBM Spectrum Protect Plus: from 10.1.0 through 10.1.10.2
- Linux kernel: all versions
- Red Hat build of Quarkus: from 2.0 before 2.7 — fixed in 2.7
- RedHat Codeready Linux Builder: all versions
- RedHat Developer Tools: 1.0
- Red Hat Enterprise Linux: 6.0, 7.0, 8.0
- RedHat Enterprise Linux Aus: 8.6
- RedHat Enterprise Linux For Ibm Z Systems: 8.0
- RedHat Enterprise Linux For Ibm Z Systems Eus: 8.6
- RedHat Enterprise Linux For Power Little Endian: 8.0
- RedHat Enterprise Linux For Power Little Endian Eus: 8.6
- RedHat Enterprise Linux For Real Time: 8
- RedHat Enterprise Linux For Real Time For Nfv: 8
- RedHat Enterprise Linux For Real Time For Nfv Tus: 8.6
- RedHat Enterprise Linux For Real Time Tus: 8.6
- RedHat Enterprise Linux Server Aus: 8.6
- RedHat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions: 8.6
- RedHat Enterprise Linux Server Tus: 8.6
- Red Hat OpenShift Container Platform 4.18: 4.6, 4.7, 4.9
- RedHat Virtualization Host: 4.0
How to fix
Upgrade to a fixed version: Red Hat build of Quarkus 2.7. Check the vendor advisory for mitigations.
References
- https://access.redhat.com/security/cve/CVE-2021-3669
- https://bugzilla.redhat.com/show_bug.cgi?id=1980619
- https://bugzilla.redhat.com/show_bug.cgi?id=1986473
- https://security-tracker.debian.org/tracker/CVE-2021-3669
- https://access.redhat.com/security/cve/CVE-2021-3669
- https://bugzilla.redhat.com/show_bug.cgi?id=1980619
- https://bugzilla.redhat.com/show_bug.cgi?id=1986473
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
- https://security-tracker.debian.org/tracker/CVE-2021-3669
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