CVE-2011-1823 is a privilege escalation vulnerability in Android Android OS. CISA added it to the Known Exploited Vulnerabilities catalogue on 8 September 2022, which means attackers have used it in real attacks. The vold volume manager daemon in Android kernel trusts messages from a PF_NETLINK socket, which allows an attacker to execute code and gain root privileges.
What this vulnerability means in Android
CVE-2011-1823 is a privilege-escalation flaw in Android where the vold volume manager daemon trusted messages from a PF_NETLINK socket. That matters because vold sits close to storage and system-level operations, so a message-handling trust error can become a path from a restricted context to root-level control.
The key lesson is not just that a bug existed, but that kernel-adjacent daemons must treat local message sources as hostile unless they are explicitly authenticated and validated. When a component assumes trust inside a privileged boundary, a single parsing or trust failure can become a full-system compromise.
Why this kind of flaw is dangerous
Privilege escalation vulnerabilities are especially serious on mobile platforms because they can convert a limited app or local foothold into device-wide control. Once an attacker reaches root, they can often bypass application sandboxing, alter security settings, access protected data, and persist in ways that are difficult for the user to notice.
For this CVE, the danger is amplified by the daemon’s role in core system behaviour. A flaw in a trusted service can give an attacker a stable route into the operating system’s control plane rather than only into one app or one file.
For current product and patch details, readers should use the vendor advisory and the NIST National Vulnerability Database alongside the CVE Program entry for the exact record.
How organisations assess exposure and reduce blast radius
Exposure review starts with knowing where the affected Android builds, devices, and embedded deployments exist, then checking whether any of them are internet-facing, externally managed, or tied to sensitive data and credentials. In practice, asset inventory and version visibility are what make a vulnerability like this actionable.
Where immediate patching is not yet possible, compensating controls focus on reducing the chance that an attacker can reach the vulnerable code path or turn a foothold into durable privilege. That can include tightening device management, reducing local admin exposure, constraining sideloading and debugging paths, and prioritising systems that hold sensitive identities, tokens, or corporate data.
Use the Vulnerability Management Guide to place KEV-listed flaws into an inventory-led remediation workflow, and pair it with CVE Program records plus vendor guidance for authoritative tracking.
Detection and post-compromise review
Detection should look for signs that a device moved from normal user-space behaviour into privileged modification, especially if system files, storage state, or security settings changed unexpectedly. On Android fleets, review logs, management telemetry, and integrity signals for evidence that the compromise happened before a patch was applied.
After remediation, organisations should still assume the device may have been exposed to post-exploitation activity. That means reviewing whether apps, credentials, sessions, or corporate data on the device could have been accessed while the attacker had root-level control, and then deciding whether re-enrolment, rebuild, or credential rotation is warranted.
For attack-path context, the MITRE ATT&CK Enterprise Matrix is useful for mapping privilege escalation, persistence, and follow-on collection behaviour after initial exploitation.
Risk and Threat Considerations
This flaw is dangerous because it can turn a local or application-level foothold into full device compromise, which dramatically expands what an attacker can read, modify, or persist on the system. The practical risk is not just unauthorized access, but the loss of trust in the entire Android instance after privileged code execution.
Failure mechanism: vold trusted PF_NETLINK messages that should have been treated as attacker-controlled input, allowing crafted communication to influence privileged behaviour and escalate to root.
Impact: Once root is obtained, an attacker can bypass sandboxing, tamper with storage and security settings, and use the device as a platform for deeper compromise or data theft.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST CSF 2.0 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | ID.AM-02 — Software, Hardware, Data, and Network Inventories | Android CVE exposure depends on knowing which devices and builds exist. |
| PR.PS-03 — Least Functionality | Limiting unnecessary local capabilities reduces escalation opportunity on mobile devices. | |
| DE.CM-01 — Networks and Network Services Monitored | Monitoring helps spot abnormal device activity after exploitation or during compromise review. | |
| Recommendation — Maintain accurate device and software inventories to find affected Android assets fast. Restrict unnecessary services and local capabilities to shrink escalation paths. Monitor device and network behaviour for signs of privilege escalation or tampering. | ||
| NIST SP 800-53 Rev 5 | CM-7 — Least Functionality | Android hardening and exposure reduction align with removing unnecessary functions and attack surface. |
| SI-2 — Flaw Remediation | This CVE requires timely remediation and verification of patched status. | |
| Recommendation — Disable unnecessary functions and services to reduce exploitable surface area. Patch the vulnerable Android components and confirm remediation is complete. | ||
Practitioner Guidance
Why practitioners should care: KEV-listed privilege-escalation flaws should be treated as active exposure, not abstract vulnerability history. For mobile fleets, the operational question is whether any device still runs the vulnerable code path and whether that device carries business-critical identities, data, or access.
Practitioner takeaway: Prioritise inventory accuracy and patch confirmation first, then verify whether the device was potentially compromised before closing the case.