CVE-2025-68376

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

coresight: ETR: Fix ETR buffer use-after-free issue

When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed

and enabled again, currently sysfs_buf will point to the newly

allocated memory(buf_new) and free the old memory(buf_old). But the

etr_buf that is being used by the ETR remains pointed to buf_old, not

updated to buf_new. In this case, it will result in a memory

use-after-free issue.

Fix this by checking ETR's mode before updating and releasing buf_old,

if the mode is CS_MODE_SYSFS, then skip updating and releasing it.