CVE-2021-4028
Last modified
CVE-2021-4028 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.. EPSS estimates a 0.30% chance of exploitation in the next 30 days.
Description
A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 5.10, < 5.10.71 | — |
| Linux | Linux Kernel | >= 5.11, < 5.14.10 | — |
| Suse | Linux Enterprise | 15.0 | Sp3 |
References
- https://access.redhat.com/security/cve/CVE-2021-4028Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2027201Issue Tracking, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1193167#c0Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74Mailing List, Patch, Vendor Advisory
- https://lkml.org/lkml/2021/10/4/697Mailing List, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20221228-0002/Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-4028Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2027201Issue Tracking, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1193167#c0Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74Mailing List, Patch, Vendor Advisory
- https://lkml.org/lkml/2021/10/4/697Mailing List, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20221228-0002/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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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.
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