CVE-2026-23243

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the Linux kernel’s RDMA/umad component where a negative data len value can occur in the ib umad write function. This happens when there is a mismatch between the user-controlled MAD header size and the RMPP header length. The negative data len can then lead to an out-of-bounds write in the alloc send rmpp list() function via an incorrect padding calculation within ib create send mad(). The issue is addressed by adding a check to reject negative data len values before creating the send buffer. The function ib umad write computes data len from a user-controlled count and MAD header sizes.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.