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How the CVE Works:
CVE-2024-1086 is a use-after-free vulnerability in the Linux kernel’s Netfilter subsystem, specifically in the `nf_tables` component. The flaw occurs when improperly handling batch requests, allowing a local attacker to free a heap object while it is still being referenced. This leads to memory corruption, which can be exploited to escalate privileges or crash the system. Attackers can craft malicious Netfilter rules to trigger the vulnerability, bypassing security mechanisms like KASLR and SMAP.
DailyCVE Form:
Platform: Linux Kernel
Version: 5.14 – 6.6
Vulnerability: Use-After-Free
Severity: Critical
Date: 2024-01-18
Prediction: Patch expected by 2024-02-15
What Undercode Say:
Check kernel version uname -r Exploit PoC detection dmesg | grep "netfilter" Mitigation (until patch) echo 1 > /proc/sys/kernel/unprivileged_userns_clone
How Exploit:
- Craft malicious Netfilter batch rules.
- Trigger UAF via
nf_tables_activate(). - Overwrite freed memory for privilege escalation.
Protection from this CVE:
- Apply kernel patches >=6.6.4.
- Restrict unprivileged user namespaces.
- Disable unnecessary Netfilter modules.
Impact:
- Local privilege escalation to root.
- Kernel panic (DoS).
- Bypass security mitigations.
Sources:
Reported By: www.cve.org
Extra Source Hub:
Undercode
