CVE-2019-19056 Explained : Impact and Mitigation

A memory leak vulnerability in the mwifiex_pcie_alloc_cmdrsp_buf() function in the Linux kernel before version 5.3.11 can lead to denial of service attacks. This vulnerability is identified as CID-db8fd2cde932.

Understanding CVE-2019-19056

This CVE involves a memory leak vulnerability in a specific function of the Linux kernel, potentially allowing attackers to disrupt system functionality.

What is CVE-2019-19056?

The mwifiex_pcie_alloc_cmdrsp_buf() function in the Linux kernel before version 5.3.11 has a memory leak vulnerability. Attackers can exploit this flaw to trigger denial of service scenarios by causing failures in the mwifiex_map_pci_memory() function.

The Impact of CVE-2019-19056

This vulnerability can be exploited by attackers to create a denial of service scenario by causing failures in the mwifiex_map_pci_memory() function.

Technical Details of CVE-2019-19056

This section provides more in-depth technical details about the vulnerability.

Vulnerability Description

A memory leak in the mwifiex_pcie_alloc_cmdrsp_buf() function in the Linux kernel through 5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering mwifiex_map_pci_memory() failures, aka CID-db8fd2cde932.

Affected Systems and Versions

Affected System: Linux kernel before version 5.3.11
Vulnerable Function: mwifiex_pcie_alloc_cmdrsp_buf()

Exploitation Mechanism

Attackers can exploit this vulnerability by triggering failures in the mwifiex_map_pci_memory() function, leading to memory leaks and potential denial of service attacks.

Mitigation and Prevention

Protecting systems from CVE-2019-19056 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update to a patched version of the Linux kernel (version 5.3.11 or newer)
Monitor system logs for any signs of memory leaks or denial of service attacks

Long-Term Security Practices

Regularly update the Linux kernel and other system components
Implement network security measures to detect and prevent potential attacks

Patching and Updates

Ensure timely installation of security patches and updates to mitigate the risk of exploitation.