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CVE-2026-23243 is a buffer-size calculation vulnerability in the Linux kernel RDMA/umad subsystem. The ib_umad_write function derives data_len from a user-controlled count and MAD header sizes. A mismatch between the user MAD header size and the RMPP header length can produce a negative data_len that reaches ib_create_send_mad(). The resulting padding calculation can exceed the segment size and trigger an out-of-bounds memset in alloc_send_rmpp_list(). A KASAN diagnostic demonstrated a 220-byte slab-out-of-bounds write. The flaw was introduced in Linux 2.6.24 and permits a local user with access to the umad interface to corrupt kernel memory.
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A Linux kernel RDMA/UMAD vulnerability allows user-controlled input to produce a negative data length, causing an incorrect padding calculation and an out-of-bounds memory write. The supplied CVSS v3 score is 7.8, with local access and low privileges required and potentially high confidentiality, integrity, and availability impacts. The fix rejects negative data_len before creating the send buffer. The advisory directs users to update sys-kernel/csql-kernel-6_1 and related packages to version 18613.534.44 or later.
A Linux kernel RDMA/umad vulnerability allows user-controlled input to produce a negative data length, resulting in an out-of-bounds memory write during send-buffer allocation. The listed CVSS v3 score is 7.8, with local access and low privileges required and potential high confidentiality, integrity, and availability impacts. The fix explicitly rejects negative data lengths before creating the send buffer.
A Linux kernel RDMA/umad vulnerability allows user-controlled input to produce a negative data length, causing an incorrect padding calculation and an out-of-bounds memory write. The listed CVSS v3 score is 7.8, with local access and low privileges required and high potential confidentiality, integrity, and availability impacts. The fix explicitly rejects negative data_len values before creating the send buffer.
A Linux kernel vulnerability in RDMA umad that can lead to denial of service and memory corruption.
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