CVE-2021-4083
HIGHCVSS 7/10EPSS 0.31%
Last modified
CVE-2021-4083 is a high-severity vulnerability rated 7/10 on the CVSS scale. A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system. EPSS estimates a 0.31% chance of exploitation in the next 30 days.
Description
A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system. This flaw affects Linux kernel versions prior to 5.16-rc4.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | < 4.4.294 | — |
| Linux | Linux Kernel | >= 4.5, < 4.9.292 | — |
| Linux | Linux Kernel | >= 4.10, < 4.14.257 | — |
| Linux | Linux Kernel | >= 4.15, < 4.19.220 | — |
| Linux | Linux Kernel | >= 4.20, < 5.4.164 | — |
| Linux | Linux Kernel | >= 5.5.0, < 5.10.84 | — |
| Linux | Linux Kernel | >= 5.11, < 5.15.7 | — |
| Linux | Linux Kernel | 5.16 | Rc1 |
| Netapp | H410c Firmware | All versions | — |
| Netapp | H300s Firmware | All versions | — |
| Netapp | H500s Firmware | All versions | — |
| Netapp | H700s Firmware | All versions | — |
| Netapp | H300e Firmware | All versions | — |
| Netapp | H500e Firmware | All versions | — |
| Netapp | H700e Firmware | All versions | — |
| Netapp | H410s Firmware | All versions | — |
| Debian | Debian Linux | 9.0 | — |
| Debian | Debian Linux | 10.0 | — |
| Netapp | Hci Management Node | All versions | — |
| Netapp | Solidfire | All versions | — |
| Oracle | Communications Cloud Native Core Binding Support Function | 22.1.3 | — |
| Oracle | Communications Cloud Native Core Network Exposure Function | 22.1.1 | — |
| Oracle | Communications Cloud Native Core Policy | 22.2.0 | — |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2029923Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220217-0005/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5096Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2029923Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220217-0005/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5096Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4083?
A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system. This flaw affects Linux kernel versions prior to 5.16-rc4.
How severe is CVE-2021-4083?
CVE-2021-4083 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4083?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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