CVE-2026-43206

A flaw was found in the Linux kernel's drm/amdkfd component. An unprivileged local user can exploit an out-of-bounds write vulnerability in the kfd_event_page_set() function. This occurs because the function writes data without properly validating the buffer size, allowing a small buffer to trigger a write beyond its allocated memory. Successful exploitation of this flaw could lead to potential privilege escalation.

This Important vulnerability in the drm/amdkfd kernel module allows an unprivileged local attacker to trigger an out-of-bounds write, potentially leading to privilege escalation. Systems running Red Hat Enterprise Linux with AMD graphics drivers are affected.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the amdkfd kernel module from loading if it is not required. This can be achieved by blacklisting the module.

1. Create a new file /etc/modprobe.d/blacklist-amdkfd.conf with the following content: blacklist amdkfd

2. Regenerate the initramfs to ensure the blacklist is applied during boot: sudo dracut -f -v (for RHEL 8/9) sudo mkinitrd -f -v /boot/initramfs-$(uname -r).img $(uname -r) (for RHEL 7)

3. Reboot the system for the changes to take effect.

Note: Blacklisting the amdkfd module may impact functionality that relies on the AMD KFD driver, such as certain AMD GPU compute features. Evaluate the necessity of this module before applying the mitigation.