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How the Mentioned CVE Works
CVE-2023-32233 is a use-after-free vulnerability in the Linux kernel’s Netfilter subsystem, specifically in the `nf_tables` component. The flaw occurs when handling batch requests that add and delete rulesets, leading to improper cleanup of internal state. Attackers can exploit this by sending crafted network packets that trigger the erroneous deallocation of a rule object while it is still being referenced. This results in memory corruption, allowing arbitrary code execution with kernel privileges. The vulnerability affects kernel versions 5.14 through 6.3 and requires no user interaction, making it highly exploitable in networked environments.
DailyCVE Form:
Platform: Linux Kernel
Version: 5.14-6.3
Vulnerability: Use-After-Free
Severity: Critical
Date: 2023-05-18
Prediction: Patch expected by 2023-06-15
What Undercode Say
Check kernel version uname -r Verify if vulnerable grep "CONFIG_NF_TABLES" /boot/config-$(uname -r) Temporary mitigation (disable nf_tables) sudo modprobe -r nf_tables
How Exploit
- Crafted Netfilter batch requests trigger UAF.
- Exploits leverage race conditions for privilege escalation.
- Remote exploitation possible via malicious packets.
Protection from this CVE
- Apply kernel patches >=6.3.4.
- Disable `nf_tables` if unused.
- Restrict untrusted network access.
Impact
- Full system compromise.
- Bypasses security mechanisms (SELinux/AppArmor).
- Network-facing systems at highest risk.
Sources:
Reported By: www.cve.org
Extra Source Hub:
Undercode
