CVE-2014-3153

What it actually does

The futex_requeue function fails to validate that two distinct futex addresses are supplied, permitting a local process to perform unsafe modification of kernel waiter structures and overwrite kernel memory to elevate privileges.

Why it matters to the business

Unpatched systems allow any local user to obtain full root control, enabling data theft, ransomware deployment, or persistence on thousands of Linux distributions and downstream products long after the CISA KEV deadline.

How an attack unfolds

An attacker with local shell access invokes a crafted FUTEX_REQUEUE operation that bypasses address checks, corrupts waiter lists, and redirects execution to attacker-controlled code, achieving kernel-level privileges; known public exploits have been used by threat actors exploiting the Linux Kernel Privilege Escalation Vulnerability.

How to fix it

Apply the kernel patch that enforces distinct futex addresses for requeue operations; upgrade to a vendor-supplied fixed kernel for each affected distribution (Red Hat, SUSE, Ubuntu, Oracle, openSUSE) and reboot.

How to confirm the fix worked

Confirm the running kernel version is newer than 3.14.5 and contains the futex_requeue address validation fix; re-test with known public exploit code in a lab environment to verify privilege escalation is blocked.

Typical attack path

1. Obtain local unprivileged access via valid credentials or another vector
2. Execute exploit binary or script that issues the malicious FUTEX_REQUEUE syscall
3. Trigger waiter list corruption to overwrite kernel function pointers or credentials
4. Spawn a root shell or install persistent backdoor

How to detect it

Review kernel audit logs and syscall traces for repeated or malformed futex_requeue calls; search process execution logs and EDR telemetry for known exploit binaries or compilation artifacts related to the Linux Kernel Privilege Escalation Vulnerability.

What your security team should do

• Immediately inventory all Linux systems and prioritize patching those still running kernels <= 3.14.5
• Enforce least-privilege access and monitor for local privilege-escalation attempts until patches are deployed
• Block known public exploit binaries via application allow-listing where feasible