Horizon Alert
Summary of the vulnerability and why it matters
The Linux kernel's nftables component contains a flaw that can lead to a use-after-free condition. This occurs when an nft object references an nft set that resides in a different nft table. When the table containing the set is deleted, the original object retains a reference to the now-invalid memory location.
- Vulnerable component: Linux kernel nftables
- Core weakness: Use-after-free in cross-table set references
- Main business impact: Privilege escalation
Attack Path
How an attacker could exploit the issue
A vulnerability exists where an nft object can reference an nft set in a different nft table. When that table is deleted, it can lead to a use-after-free condition. This allows for potential system compromise.
- Local access required.
- Attacker triggers table deletion.
- Attacker gains control.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability impacts systems that utilize the Linux kernel. Attackers with local access could exploit a flaw in how network filtering objects are handled, potentially leading to unauthorized system control. The potential damage includes significant disruption and data compromise.
- Likely attacker skill level: Low
- Required access or conditions: Local system access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability involves a use-after-free issue within the Linux kernel's netfilter subsystem. It could allow an attacker with local access to potentially impact system integrity and confidentiality. The Common Vulnerabilities and Exposures (CVE) catalog lists this as a known exploited vulnerability, indicating a potential risk to affected organizations.
- Identify systems running affected Linux kernel versions.
- Limit local access to critical systems.
- Apply vendor patches and verify system integrity.
