Actively exploited in the wild
Linux Kernel Use-After-Free Vulnerability
Linux - Kernel · Listed in the CISA KEV since 2024-05-30. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CVE-2024-1086
HighCVSS 7.8KEVExploitation Probability (EPSS)
Very high risk98th percentile - higher than 98% of all known CVEs
Summary
A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The nft_verdict_init() function allows positive values as drop error within the hook verdict, leading to a double free in nf_hook_slow().
Risk Assessment
An attacker with local access can gain elevated privileges, potentially leading to full system compromise.
Recommendation
Upgrade the Linux kernel to a version containing commit f342de4e2f33e0e39165d8639387aa6c19dff660 or later.
Original NVD description (English source)
A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The nft_verdict_init() function allows positive values as drop error within the hook verdict, and hence the nf_hook_slow() function can cause a double free vulnerability when NF_DROP is issued with a drop error which resembles NF_ACCEPT. We recommend upgrading past commit f342de4e2f33e0e39165d8639387aa6c19dff660.