Out-of-bounds read in Linux kernel - CVE-2026-80749

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in drm_atomic_helper_connector_hdmi_update_audio_infoframe when processing an audio infoframe. A local user can trigger the helper function to copy an audio infoframe to cause a denial of service.

The read can extend beyond a page boundary and cause an access violation.

Affected software

How to mitigate CVE-2026-80749

External References

• https://git.kernel.org/stable/c/9ecf8ba763d0ffe0673538eb4bf7806f20455d19
• https://git.kernel.org/stable/c/d9f7454c185c0c7f0973e11d62ad6c06862c324c
• https://git.kernel.org/stable/c/e5b527804a1ea4f70e139179d3062cf5de8c06ab
• https://git.kernel.org/stable/c/f72bb95732bc5ca87b50c52c8f087ba501950809

Related Security Bulletins

• Out-of-bounds read in Linux kernel drm display driver