Horizon Alert
Summary of the vulnerability and why it matters
The Linux kernel contains a flaw in its futex_requeue function. This weakness allows local users to execute commands with elevated privileges. Such an event could lead to unauthorized system access and potential data compromise.
- Vulnerable component: Linux kernel futex_requeue function
- Core weakness: Unsafe waiter modification
- Main business impact: Privilege escalation
Attack Path
How an attacker could exploit the issue
A local user can gain privileges by exploiting a flaw in the Linux kernel's futex_requeue function. This function does not properly validate futex addresses, enabling an attacker to manipulate waiting processes. This manipulation can lead to unauthorized privilege escalation on the affected system.
- Local user access required.
- Malicious FUTEX_REQUEUE command.
- Unsafe waiter modification.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows local users to gain elevated privileges on a system by exploiting a flaw in the Linux kernel's futex_requeue function. An attacker with existing local access could use a specially crafted command to modify system processes, potentially leading to unauthorized control. The risk to an organization arises from the possibility of a compromised user account escalating its permissions.
- Attacker needs local access.
- Difficult exploit requires technical skill.
- Business risk is elevated privileges.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in the Linux kernel could allow local users to gain elevated privileges. The exploit involves a specific function that does not properly validate futex addresses. Affected systems are those running vulnerable versions of the Linux kernel.
- Identify systems running vulnerable Linux kernel versions.
- Isolate or restrict access to affected systems.
- Apply vendor patches and validate the fix.
- Monitor for unusual activity.
