CVE-2025-71068 in Linux
Summary
by MITRE • 01/13/2026
In the Linux kernel, the following vulnerability has been resolved:
svcrdma: bound check rq_pages index in inline path
svc_rdma_copy_inline_range indexed rqstp->rq_pages[rc_curpage] without
verifying rc_curpage stays within the allocated page array. Add guards before the first use and after advancing to a new page.
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Analysis
by VulDB Data Team • 02/24/2026
The vulnerability identified as CVE-2025-71068 represents a critical buffer overread condition within the Linux kernel's svcrdma subsystem, specifically affecting the svc_rdma_copy_inline_range function. This flaw resides in the RDMA (Remote Direct Memory Access) implementation that handles network service requests, where the kernel processes inline data transfers between network clients and servers. The issue manifests when the kernel attempts to access memory locations beyond the bounds of a pre-allocated page array, creating potential for arbitrary code execution or system instability.
The technical root cause of this vulnerability stems from inadequate input validation within the svcrdma subsystem's inline data processing path. The svc_rdma_copy_inline_range function directly indexes into the rqstp->rq_pages array using rc_curpage as an index without performing boundary checks to ensure that rc_curpage remains within the valid range of the allocated page array. This programming error creates a classic buffer overread scenario where the kernel may access memory locations that were never properly initialized or allocated, potentially exposing sensitive kernel memory contents or causing memory corruption that could be exploited by malicious actors.
The operational impact of CVE-2025-71068 extends beyond simple memory corruption, as it represents a potential attack vector for privilege escalation and system compromise. When exploited, this vulnerability could allow remote attackers to read kernel memory, potentially extracting sensitive information such as cryptographic keys, credentials, or other confidential data stored in kernel space. The vulnerability is particularly concerning in environments where RDMA services are actively deployed, as it could be triggered through normal network service operations without requiring special privileges. This aligns with CWE-129, which specifically addresses improper validation of array indices, and represents a direct violation of secure coding practices for memory access validation.
Security professionals should prioritize patching systems running affected Linux kernel versions, as this vulnerability could be exploited in the wild to gain unauthorized access to systems. The recommended mitigation strategy involves applying the upstream kernel patch that implements proper bounds checking before array access and after page advancement. This fix implements defensive programming practices that align with the ATT&CK framework's defense evasion techniques, specifically targeting the exploitation of memory corruption vulnerabilities. Organizations should also implement network segmentation and monitoring to detect potential exploitation attempts, while ensuring that RDMA services are properly configured with appropriate access controls and firewall rules to minimize the attack surface.
The vulnerability demonstrates the critical importance of proper input validation in kernel space operations, where a single missing bounds check can create significant security risks. This issue highlights the ongoing challenges in maintaining secure kernel implementations, particularly in complex subsystems like RDMA that handle high-performance network operations. The fix required for CVE-2025-71068 serves as a reminder of the need for comprehensive code review processes and automated security testing in kernel development, as such flaws can remain undetected for extended periods in production systems.