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CVE-2022-3176

7.8 · HIGH

There exists a use-after-free in io_uring in the Linux kernel.

Published Sep 16, 2022CWE-416EPSS 0.30%

Overview

CVE-2022-3176 is a high-severity vulnerability. It was published on September 16, 2022 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

There exists a use-after-free in io_uring in the Linux kernel. Signalfd_poll() and binder_poll() use a waitqueue whose lifetime is the current task. It will send a POLLFREE notification to all waiters before the queue is freed. Unfortunately, the io_uring poll doesn't handle POLLFREE. This allows a use-after-free to occur if a signalfd or binder fd is polled with io_uring poll, and the waitqueue gets freed. We recommend upgrading past commit fc78b2fc21f10c4c9c4d5d659a685710ffa63659

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-5.4.y&id=fc78b2fc21f10c4c9c4d5d659a685710ffa63659Refkernel.dance/#fc78b2fc21f10c4c9c4d5d659a685710ffa63659Reflists.debian.org/debian-lts-announce/2022/11/msg00001.htmlRefsecurity.netapp.com/advisory/ntap-20230216-0003/Refwww.debian.org/security/2022/dsa-5257Refgit.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-5.4.y&id=fc78b2fc21f10c4c9c4d5d659a685710ffa63659Refkernel.dance/#fc78b2fc21f10c4c9c4d5d659a685710ffa63659Reflists.debian.org/debian-lts-announce/2022/11/msg00001.htmlRefsecurity.netapp.com/advisory/ntap-20230216-0003/Refwww.debian.org/security/2022/dsa-5257

How CyberStrike helps

Frequently asked questions

What is CVE-2022-3176?

CVE-2022-3176 is a high-severity vulnerability. It was published on September 16, 2022 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-3176?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-3176?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-3176?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-3176 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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