IT

Tracker / CVE-2026-23243

CVE-2026-23243

High 7.8

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

Affected products and versions

linux linux_kernel
linux linux_kernel · 2.6.24.1 → 5.10.252
linux linux_kernel · 5.11 → 5.15.202
linux linux_kernel · 5.16 → 6.1.165
linux linux_kernel · 6.13 → 6.18.14
linux linux_kernel · 6.19 → 6.19.4
linux linux_kernel · 6.2 → 6.6.128
linux linux_kernel · 6.7 → 6.12.75

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References