CVE-2026-99214

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/vc4: hdmi: Move packet RAM enable to PM runtime<br /> <br /> Audio can be triggered by the HPD handler and start up before video has<br /> been restored, calling vc4_hdmi_write_infoframe() for the audio infoframe.<br /> vc4_hdmi_write_infoframe() needs Packet RAM to be on to store the<br /> infoframe, however, if the video hasn&amp;#39;t been enabled,<br /> vc4_hdmi_encoder_post_crtc_enable() hasn&amp;#39;t been called and therefore, the<br /> Packet RAM can be disabled by the time vc4_hdmi_write_infoframe() executes,<br /> causing the following splat:<br /> <br /> [ 201.570266] ------------[ cut here ]------------<br /> [ 201.570293] Packet RAM has to be on to store the packet.<br /> [ 201.570367] WARNING: drivers/gpu/drm/vc4/vc4_hdmi.c:683 at vc4_hdmi_write_infoframe+0x404/0x494 [vc4], CPU#0: wireplumber/1606<br /> [...]<br /> [ 201.658650] Hardware name: Raspberry Pi 4 Model B Rev 1.5 (DT)<br /> [...]<br /> [ 201.758499] Call trace:<br /> [ 201.760967] vc4_hdmi_write_infoframe+0x404/0x494 [vc4] (P)<br /> [ 201.766607] vc4_hdmi_write_audio_infoframe+0x1c/0x28 [vc4]<br /> [ 201.772247] write_infoframe+0xbc/0x140 [drm_display_helper]<br /> [ 201.777975] drm_atomic_helper_connector_hdmi_update_audio_infoframe+0x80/0xdc [drm_display_helper]<br /> [ 201.787140] vc4_hdmi_audio_prepare+0x4ac/0x570 [vc4]<br /> [ 201.792252] drm_connector_hdmi_audio_prepare+0x24/0x30 [drm_display_helper]<br /> [ 201.799390] hdmi_codec_prepare+0x100/0x160 [snd_soc_hdmi_codec]<br /> [ 201.805471] snd_soc_pcm_dai_prepare+0xd4/0x100 [snd_soc_core]<br /> [ 201.811375] __soc_pcm_prepare+0x60/0x12c [snd_soc_core]<br /> [ 201.816752] soc_pcm_prepare+0x34/0x58 [snd_soc_core]<br /> [ 201.821863] snd_pcm_do_prepare+0x70/0x8c [snd_pcm]<br /> [ 201.826798] snd_pcm_action_nonatomic+0xe4/0x174 [snd_pcm]<br /> [ 201.832350] snd_pcm_prepare+0xc8/0xd8 [snd_pcm]<br /> [ 201.837021] snd_pcm_common_ioctl+0x458/0x614 [snd_pcm]<br /> [ 201.842308] snd_pcm_ioctl+0x30/0x48 [snd_pcm]<br /> [ 201.846802] __arm64_sys_ioctl+0x88/0xd8<br /> [ 201.850769] invoke_syscall+0x48/0xf4<br /> [ 201.854470] el0_svc_common+0x80/0xd8<br /> [ 201.858171] do_el0_svc+0x1c/0x28<br /> [ 201.861520] el0_svc+0x3c/0xb0<br /> [ 201.864605] el0t_64_sync_handler+0x68/0xdc<br /> [ 201.868834] el0t_64_sync+0x198/0x19c<br /> [ 201.872536] ---[ end trace 0000000000000000 ]---<br /> <br /> Considering that Packet RAM enable is essentially a power management<br /> configuration, move its enabling/disabling to the Runtime PM hooks.<br /> <br /> Note that post_crtc_disable() still stops all infoframes, but keeps Packet<br /> RAM enabled, leaving it to be disabled by runtime suspend.