CVE-2026-63797

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

rpmsg: char: Fix use-after-free on probe error path

rpmsg_chrdev_probe() stores the newly allocated eptdev in the default

endpoint's priv pointer before calling rpmsg_chrdev_eptdev_add(). If

rpmsg_chrdev_eptdev_add() then fails, its error path frees eptdev while

the default endpoint may still dispatch callbacks with the stale priv

pointer.

Avoid publishing eptdev through the default endpoint until

rpmsg_chrdev_eptdev_add() succeeds. Messages received before the priv

pointer is published should be ignored by rpmsg_ept_cb(). Flow-control

updates can hit rpmsg_ept_flow_cb() in the same window, so make both

callbacks return success when priv is NULL.