CVE-2026-53151 Linux CVE debrief

Who should care

System administrators and security teams responsible for Linux kernel-based systems should be aware of this vulnerability. The vulnerability's high CVSS score and potential for denial of service or code execution make it a priority for patching. Linux distributions and vendors should also be aware of this vulnerability and provide patches or updates to affected systems.

Technical summary

The vulnerability is located in the rxrpc ACK parser in the Linux kernel. The parser does not properly handle the SACK table in ACK packets, leading to potential buffer access issues. Specifically, the rxrpc_input_soft_acks() function modifies the received skbuff, and the rxrpc_input_ack() function accesses the SACK table without properly checking the buffer. This could lead to a denial of service or potential code execution.

Defensive priority

High priority should be given to patching this vulnerability, as its CVSS score of 9.8 indicates a critical severity. System administrators and security teams should prioritize patching or updating affected Linux kernel-based systems.

Recommended defensive actions

• Apply patches or updates provided by Linux distributions or vendors to affected systems.
• Review and update system configurations to ensure that the rxrpc ACK parser is properly configured.
• Monitor system logs for potential denial of service or code execution attempts.
• Consider implementing compensating controls, such as network segmentation or access controls, to limit the impact of a potential exploit.
• Perform regular vulnerability assessments and penetration testing to identify potential vulnerabilities and weaknesses.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, including its CVSS score and potential impact. The source item URL provides additional information on the vulnerability, including references to kernel.org. The CVE.org record provides official information on the vulnerability.

Official resources