CVE-2022-0185 is a heap-based buffer overflow vulnerability in Linux Kernel. CISA added it to the Known Exploited Vulnerabilities catalogue on 21 August 2024, which means attackers have used it in real attacks. Linux kernel contains a heap-based buffer overflow vulnerability in the legacy_parse_param function in the Filesystem Context functionality.
What this vulnerability means in Linux kernel terms
CVE-2022-0185 is a heap-based buffer overflow in the Linux kernel’s filesystem context path, which matters because memory corruption in kernel space can turn an ordinary bug into a system-level compromise. For a vulnerability of this class, the danger is not just a crash, but the possibility of arbitrary code execution or privilege escalation if an attacker can drive the faulty code path.
Because the kernel sits below most application controls, a weakness like this can affect the whole host rather than one process. That is why CVE records and vendor advisories are the authoritative places to confirm scope, affected builds, and fixes, while the public CVE Program and NIST National Vulnerability Database are the normal reference points for identification and tracking.
Why heap-based buffer overflows are dangerous
Heap corruption is especially serious in kernel code because the attacker is not merely overrunning an application buffer, but potentially disturbing privileged memory structures. In practice, that can lead to denial of service, controlled memory corruption, or a chain into code execution depending on the exploitability of the vulnerable path and the mitigations in place.
This vulnerability class is dangerous in a filesystem or parameter-parsing path because inputs can arrive indirectly through common administrative or container-related workflows. Even when the exact exploit path is narrow, the impact can be broad if the kernel instance underpins many services or workloads on the same host.
How organisations check exposure and verify remediation
The first step is to identify where the vulnerable kernel is actually running, not just where Linux is present. That means maintaining an accurate asset inventory, mapping kernel versions across servers, endpoints, appliances and virtual machines, and checking whether any internet-exposed or externally reachable systems could be targeted before maintenance windows are available.
For version and patch confirmation, use the vendor’s advisory alongside the NVD record rather than relying on secondary summaries. If a patch cannot be applied immediately, reduce exposure by limiting untrusted local access, restricting who can execute administrative workloads on the host, and prioritising systems that are externally reachable or host sensitive workloads.
Detection, post-patch review and identity impact
Detection should look for signs that the kernel was already exercised in the vulnerable path, especially if the host showed crashes, unexpected reboots, or unusual privilege changes before patching. After remediation, review the system for persistence or follow-on compromise, because kernel exploitation can invalidate trust in sessions, credentials and running processes on that host.
If exploitation is suspected, rotate or reissue any credentials, tokens or service-account material that could have been exposed on the affected machine, and validate adjacent systems for lateral movement. The practical lesson is that kernel memory corruption is rarely a standalone issue, it is often an entry point to broader host compromise and identity reuse.
Risk and Threat Considerations
This vulnerability is materially risky because kernel heap corruption can give an attacker a route from a normal code path into privileged execution on the host. The threat matters most where untrusted input can reach the affected path and where the system supports many users, services or containers, since one compromised kernel instance can endanger everything running on it.
Failure mechanism: An attacker triggers the malformed filesystem context handling, corrupts heap memory, and uses the resulting instability or memory disclosure to steer execution or gain elevated privileges.
Impact: Successful exploitation can lead to denial of service, full host compromise, and secondary exposure of credentials, sessions or service material stored or active on the system.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while NIST SP 800-53 Rev 5, CIS Controls v8 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | This CVE requires timely flaw tracking and remediation on Linux hosts. |
| SI-7 — Software, Firmware, and Information Integrity | Kernel memory corruption demands integrity-focused monitoring and post-exploit review. | |
| Recommendation — Prioritise SI-2 remediation for affected Linux kernels and verify fix deployment across all exposed hosts. Apply SI-7 monitoring to detect abnormal kernel behavior and post-patch compromise indicators. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | This vulnerability should be found, prioritised and remediated through continuous scanning and exposure tracking. |
| Recommendation — Use CIS-7 to inventory affected Linux assets, prioritise exposed systems and track remediation to closure. | ||
| MITRE ATT&CK | T1068 — Exploitation for Privilege Escalation | Kernel heap corruption is a classic route to local privilege escalation. |
| Recommendation — Map exploit indicators to T1068 and hunt for privilege escalation attempts on affected Linux hosts. | ||
| OWASP ASVS | V15 — Secure Coding and Architecture | The weakness reflects unsafe memory handling that secure architecture and coding practices aim to prevent. |
| Recommendation — Use V15 to review memory-safety assumptions and harden code paths that process attacker-controlled input. | ||
Practitioner Guidance
Why practitioners should care: Treat kernel vulnerabilities as platform risk, not just patch hygiene. A single unpatched host can expose multiple workloads, so prioritisation should be based on exposure, criticality and whether the system can be reached by untrusted actors or inputs.
What to watch for: If patching is delayed, track crash logs, unexpected kernel warnings, privilege anomalies and any change in host behaviour after suspicious input handling. Those are often the earliest operational signs that a kernel memory issue has already been exercised.
Related resources from NHI Mgmt Group
- CVE-2025-21333 (Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow)
- CVE-2023-27997 (Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow)
- CVE-2025-25249 (Fortinet Multiple Products Heap-based Buffer Overflow)
- CVE-2009-3459 (Adobe Acrobat and Reader Heap-Based Buffer Overflow)
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org