CVE-2014-3153: Linux Kernel Privilege Escalation Vulnerability

CVE-2014-3153 is a privilege-escalation flaw in the Linux kernel’s futex handling. A local user who can already run code on the system may abuse the futex_requeue path to obtain higher privileges. Because the kernel sits under every process, successful exploitation can give an attacker full control of the host, making timely remediation important for any environment that runs Linux.

Public detail is limited to the description above; exact affected releases, CVSS scores, and exploit mechanics must be confirmed against the vendor advisory for your distribution.

How it works

The weakness is classified as CWE-269 (Improper Privilege Management). The futex_requeue function in kernel/futex.c did not ensure that the two futex addresses supplied in a call were distinct. A local attacker who can invoke the futex subsystem with carefully chosen arguments can therefore cause the kernel to perform operations that elevate the caller’s privileges.

No remote code execution is implied by the published summary; the attacker must already have a foothold on the machine (for example via a compromised account or a separate local vulnerability). Once elevated, the attacker can install persistence, disable security controls, or move laterally. Specific exploit sequences are not provided here and should not be assumed; defenders should treat any unpatched kernel that still contains the flawed futex_requeue logic as vulnerable until the vendor advisory states otherwise.

Am I affected? How to find it in your systems

The vulnerability affects the Linux kernel. It is therefore present on servers, workstations, containers, embedded devices, and cloud instances that run a vulnerable kernel build. Inventory steps:

• Identify every Linux host (physical, virtual, container host, and appliance) and record the running kernel version with uname -r or equivalent package-manager queries.
• Compare that version against the fixed releases listed in your distribution’s security advisory for CVE-2014-3153. If the advisory is unavailable, treat the kernel as potentially affected until you can confirm.
• Pay special attention to long-lived systems, custom kernels, and images that are rarely rebuilt; these often lag behind distribution updates.
• Review authentication and process-creation logs for unexpected privilege transitions or local accounts spawning root shells around the time of any suspected activity. Kernel audit logs (if auditd or equivalent is enabled) may show anomalous futex-related syscalls, though such signals are not unique to this CVE.

Because the flaw is local-only, external network scanners will not detect it; host-based inventory is required.

How to remediate

The primary action is to apply the vendor-supplied kernel update that corrects the futex_requeue check. Follow the CISA-required action: apply updates per vendor instructions. After installing the package, reboot into the new kernel and verify the running version.

Additional hardening appropriate to this class of local privilege-escalation issues:

• Ensure unprivileged users cannot load arbitrary kernel modules or exploit other local vectors that would give them an initial foothold.
• Run workloads with the least privilege necessary; prefer containers or VMs that drop capabilities and use user namespaces where supported.
• Keep the kernel and user-space security features (ASLR, SMEP/SMAP where available, seccomp filters) enabled so that residual local attacks are harder to weaponize.

If you can't patch immediately

Until the updated kernel can be deployed:

• Restrict local logins and sudo rights to the minimum set of administrators; remove or disable unused accounts.
• Segment hosts so that a compromised low-privilege account cannot reach high-value systems.
• Apply any vendor or community virtual-patch modules or seccomp profiles that block the vulnerable futex_requeue usage pattern, if such mitigations are offered for your distribution.
• Increase monitoring for unexpected privilege escalations, new root processes, and kernel-module loads; alert on anomalies.
• Where feasible, move critical services onto already-patched hosts or hardened container runtimes that do not expose the vulnerable kernel interface to untrusted code.

These steps only reduce risk; they do not eliminate the underlying flaw.

If your data may have been exposed

Actively exploited local privilege-escalation vulnerabilities are frequently used after an initial compromise to steal data or deploy further malware. Ransomware use of this specific CVE is not documented, yet any successful elevation can lead to broader breach activity. If you suspect the host was compromised before patching, follow your incident-response process: isolate the system, preserve volatile evidence, and rotate credentials that may have been accessible to the elevated process. As a quick additional check, you can run a free exposure scan of your email addresses against known breach data sets to see whether related accounts have appeared in prior leaks.