CVE-2025-38090 – Linux Kernel Rapidio Heap Overwrite Vulnerability

CVE ID : CVE-2025-38090

Published : June 30, 2025, 8:15 a.m. | 43 minutes ago

Description : In the Linux kernel, the following vulnerability has been resolved:

drivers/rapidio/rio_cm.c: prevent possible heap overwrite

In

riocm_cdev_ioctl(RIO_CM_CHAN_SEND)
-> cm_chan_msg_send()
-> riocm_ch_send()

cm_chan_msg_send() checks that userspace didn’t send too much data but
riocm_ch_send() failed to check that userspace sent sufficient data. The
result is that riocm_ch_send() can write to fields in the rio_ch_chan_hdr
which were outside the bounds of the space which cm_chan_msg_send()
allocated.

Address this by teaching riocm_ch_send() to check that the entire
rio_ch_chan_hdr was copied in from userspace.

Severity: 0.0 | NA

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