OpenBSD Kernel Crash via Race Condition in PF Packet State Expiration
CVE-2023-52556 Published on March 1, 2024
OpenBSD 7.4 pf state race condition kernel crash
In OpenBSD 7.4 before errata 009, a race condition between pf(4)'s processing of packets and expiration of packet states may cause a kernel panic.
Vulnerability Analysis
CVE-2023-52556 is exploitable with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a TOCTTOU Vulnerability?
The software checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the software to perform invalid actions when the resource is in an unexpected state. This weakness can be security-relevant when an attacker can influence the state of the resource between check and use. This can happen with shared resources such as files, memory, or even variables in multithreaded programs.
CVE-2023-52556 has been classified to as a TOCTTOU vulnerability or weakness.
Products Associated with CVE-2023-52556
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Affected Versions
OpenBSD:- Version 7.4 and below 7.4 errata 009 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.