CVE-2026-23243

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> RDMA/umad: Reject negative data_len in ib_umad_write<br /> <br /> ib_umad_write computes data_len from user-controlled count and the<br /> MAD header sizes. With a mismatched user MAD header size and RMPP<br /> header length, data_len can become negative and reach ib_create_send_mad().<br /> This can make the padding calculation exceed the segment size and trigger<br /> an out-of-bounds memset in alloc_send_rmpp_list().<br /> <br /> Add an explicit check to reject negative data_len before creating the<br /> send buffer.<br /> <br /> KASAN splat:<br /> [ 211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0<br /> [ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102<br /> [ 211.365867] ib_create_send_mad+0xa01/0x11b0<br /> [ 211.365887] ib_umad_write+0x853/0x1c80