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CVE-2023-52483

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mctp: perform route lookups under a RCU read-side lock Our current route lookups (mctp_route_lookup and mctp_route_lookup_null)…

Published Feb 29, 2024CWE-416EPSS 0.23%

Overview

CVE-2023-52483 is a high-severity vulnerability. It was published on February 29, 2024 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

In the Linux kernel, the following vulnerability has been resolved:

mctp: perform route lookups under a RCU read-side lock

Our current route lookups (mctp_route_lookup and mctp_route_lookup_null)

traverse the net's route list without the RCU read lock held. This means

the route lookup is subject to preemption, resulting in an potential

grace period expiry, and so an eventual kfree() while we still have the

route pointer.

Add the proper read-side critical section locks around the route

lookups, preventing premption and a possible parallel kfree.

The remaining net->mctp.routes accesses are already under a

rcu_read_lock, or protected by the RTNL for updates.

Based on an analysis from Sili Luo <[email protected]>, where

introducing a delay in the route lookup could cause a UAF on

simultaneous sendmsg() and route deletion.

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/stable/c/1db0724a01b558feb1ecae551782add1951a114aRefgit.kernel.org/stable/c/2405f64a95a7a094eb24cba9bcfaffd1ea264de4Refgit.kernel.org/stable/c/5093bbfc10ab6636b32728e35813cbd79feb063cRefgit.kernel.org/stable/c/6c52b12159049046483fdb0c411a0a1869c41a67Refgit.kernel.org/stable/c/1db0724a01b558feb1ecae551782add1951a114aRefgit.kernel.org/stable/c/2405f64a95a7a094eb24cba9bcfaffd1ea264de4Refgit.kernel.org/stable/c/5093bbfc10ab6636b32728e35813cbd79feb063cRefgit.kernel.org/stable/c/6c52b12159049046483fdb0c411a0a1869c41a67

How CyberStrike helps

Frequently asked questions

What is CVE-2023-52483?

CVE-2023-52483 is a high-severity vulnerability. It was published on February 29, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-52483?

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-2023-52483?

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-2023-52483?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-52483 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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