Bug 2524493 (CVE-2026-80542)

Summary: CVE-2026-80542 kernel: drm/amd/display: Fix NULL pointer dereference in amdgpu_dm_crtc_set_vblank()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the drm/amd/display component of the Linux kernel. The amdgpu_dm_crtc_set_vblank() function attempts to dereference a NULL pointer when vblank is enabled or queried before a display stream is properly attached. This can be triggered by a local attacker running specific graphics tests, leading to a kernel NULL pointer dereference and a system crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-08-26 15:01:19 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Fix NULL pointer dereference in amdgpu_dm_crtc_set_vblank()

amdgpu_dm_crtc_set_vblank() dereferences acrtc_state->stream when
vblank is enabled/queried from DRM_IOCTL_MODE_CRTC_GET_SEQUENCE before
a stream is attached to it.

BUG: kernel NULL pointer dereference, address: 0000000000000008
RIP: amdgpu_dm_crtc_set_vblank+0x6b/0x4d0 [amdgpu]
Call Trace:
 drm_vblank_enable
 drm_vblank_get
 drm_crtc_get_sequence_ioctl
 drm_ioctl_kernel
 drm_ioctl

Reproduced by running VKCTS with WSI tests enabled on RADV.

Guard the enable path on acrtc_state->stream being non-NULL, matching
the existing checks in this function.

(cherry picked from commit 7b1b31bf6942e6f43509b48da23f8e27269aac39)
Comment 1 gkamathe 2026-08-27 12:43:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082606-CVE-2026-80542-ede3@gregkh/T