CVE-2026-23243 - RDMA/umad: Reject negative data_len in ib_umad_write

CVE-2026-23243 - RDMA/umad: Reject negative data_len in ib_umad_write

https://cvefeed.io/rssfeed/latest.atom / Wed, 03/18/2026 - 17:07
CVE ID :CVE-2026-23243
Published : March 18, 2026, 11:16 a.m. | 3 hours, 44 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: RDMA/umad: Reject negative data_len in ib_umad_write ib_umad_write computes data_len from user-controlled count and the MAD header sizes. With a mismatched user MAD header size and RMPP header length, data_len can become negative and reach ib_create_send_mad(). This can make the padding calculation exceed the segment size and trigger an out-of-bounds memset in alloc_send_rmpp_list(). Add an explicit check to reject negative data_len before creating the send buffer. KASAN splat: [ 211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0 [ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102 [ 211.365867] ib_create_send_mad+0xa01/0x11b0 [ 211.365887] ib_umad_write+0x853/0x1c80
Severity: 0.0 | NA
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