CVE-2022-1015 in Linux
Summary
by MITRE • 04/29/2022
A flaw was found in the Linux kernel in linux/net/netfilter/nf_tables_api.c of the netfilter subsystem. This flaw allows a local user to cause an out-of-bounds write issue.
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Analysis
by VulDB Data Team • 04/03/2026
The vulnerability identified as CVE-2022-1015 represents a critical out-of-bounds write flaw within the Linux kernel's netfilter subsystem, specifically in the nf_tables_api.c file. This issue resides in the kernel's networking infrastructure where the netfilter framework handles packet filtering and manipulation. The flaw manifests when a local user process attempts to interact with the nftables API, which is the userspace component that manages netfilter rules. The vulnerability stems from insufficient bounds checking during the processing of user-supplied data structures that define netfilter table operations, creating a scenario where malicious input can cause memory corruption beyond allocated buffer boundaries.
The technical exploitation of this vulnerability occurs through the manipulation of nftables commands that interface with the kernel's netfilter subsystem. When a local user submits crafted netfilter table operations, the kernel's nf_tables_api.c code fails to properly validate array indices or buffer sizes before performing memory writes. This allows an attacker to write data beyond the intended memory locations, potentially corrupting adjacent memory regions or even overwriting critical kernel data structures. The vulnerability is classified as a local privilege escalation vector since it requires local system access but can be leveraged to gain elevated privileges within the kernel context. The flaw demonstrates characteristics consistent with CWE-129, which addresses insufficient validation of length of input buffers, and CWE-787, concerning out-of-bounds write conditions.
The operational impact of CVE-2022-1015 extends beyond simple memory corruption, as it can lead to system instability, denial of service conditions, or potentially full system compromise. A successful exploitation could result in kernel memory corruption that might trigger system crashes or allow for privilege escalation attacks. The vulnerability affects systems running Linux kernel versions where the netfilter subsystem is active, particularly those utilizing nftables for packet filtering operations. The local nature of the attack means that any user with access to the system can potentially exploit this flaw, making it particularly concerning for multi-user environments or systems where untrusted users have local access. From an ATT&CK framework perspective, this vulnerability maps to T1068, which covers local privilege escalation, and T1499, covering endpoint disruption through resource consumption or corruption.
Mitigation strategies for CVE-2022-1015 primarily involve applying the appropriate kernel security patches released by the Linux kernel maintainers. System administrators should prioritize updating their kernel versions to include fixes that address the bounds checking deficiencies in the nf_tables_api.c file. Additionally, implementing proper access controls and restricting local user privileges can help reduce the attack surface. Organizations should also consider monitoring for suspicious nftables operations and implementing kernel hardening techniques such as stack canaries, address space layout randomization, and kernel address space protection mechanisms. The vulnerability highlights the importance of thorough input validation in kernel space operations and demonstrates why robust bounds checking is essential for maintaining system integrity in low-level networking components. Regular security audits of kernel subsystems and adherence to secure coding practices are crucial for preventing similar vulnerabilities in future releases.