{"cve":"CVE-2026-99214","nvd":{"published":"2026-10-28T11:17:42.887","modified":"2026-10-28T11:17:42.887","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: hdmi: Move packet RAM enable to PM runtime\n\nAudio can be triggered by the HPD handler and start up before video has\nbeen restored, calling vc4_hdmi_write_infoframe() for the audio infoframe.\nvc4_hdmi_write_infoframe() needs Packet RAM to be on to store the\ninfoframe, however, if the video hasn't been enabled,\nvc4_hdmi_encoder_post_crtc_enable() hasn't been called and therefore, the\nPacket RAM can be disabled by the time vc4_hdmi_write_infoframe() executes,\ncausing the following splat:\n\n[  201.570266] ------------[ cut here ]------------\n[  201.570293] Packet RAM has to be on to store the packet.\n[  201.570367] WARNING: drivers/gpu/drm/vc4/vc4_hdmi.c:683 at vc4_hdmi_write_infoframe+0x404/0x494 [vc4], CPU#0: wireplumber/1606\n[...]\n[  201.658650] Hardware name: Raspberry Pi 4 Model B Rev 1.5 (DT)\n[...]\n[  201.758499] Call trace:\n[  201.760967]  vc4_hdmi_write_infoframe+0x404/0x494 [vc4] (P)\n[  201.766607]  vc4_hdmi_write_audio_infoframe+0x1c/0x28 [vc4]\n[  201.772247]  write_infoframe+0xbc/0x140 [drm_display_helper]\n[  201.777975]  drm_atomic_helper_connector_hdmi_update_audio_infoframe+0x80/0xdc [drm_display_helper]\n[  201.787140]  vc4_hdmi_audio_prepare+0x4ac/0x570 [vc4]\n[  201.792252]  drm_connector_hdmi_audio_prepare+0x24/0x30 [drm_display_helper]\n[  201.799390]  hdmi_codec_prepare+0x100/0x160 [snd_soc_hdmi_codec]\n[  201.805471]  snd_soc_pcm_dai_prepare+0xd4/0x100 [snd_soc_core]\n[  201.811375]  __soc_pcm_prepare+0x60/0x12c [snd_soc_core]\n[  201.816752]  soc_pcm_prepare+0x34/0x58 [snd_soc_core]\n[  201.821863]  snd_pcm_do_prepare+0x70/0x8c [snd_pcm]\n[  201.826798]  snd_pcm_action_nonatomic+0xe4/0x174 [snd_pcm]\n[  201.832350]  snd_pcm_prepare+0xc8/0xd8 [snd_pcm]\n[  201.837021]  snd_pcm_common_ioctl+0x458/0x614 [snd_pcm]\n[  201.842308]  snd_pcm_ioctl+0x30/0x48 [snd_pcm]\n[  201.846802]  __arm64_sys_ioctl+0x88/0xd8\n[  201.850769]  invoke_syscall+0x48/0xf4\n[  201.854470]  el0_svc_common+0x80/0xd8\n[  201.858171]  do_el0_svc+0x1c/0x28\n[  201.861520]  el0_svc+0x3c/0xb0\n[  201.864605]  el0t_64_sync_handler+0x68/0xdc\n[  201.868834]  el0t_64_sync+0x198/0x19c\n[  201.872536] ---[ end trace 0000000000000000 ]---\n\nConsidering that Packet RAM enable is essentially a power management\nconfiguration, move its enabling/disabling to the Runtime PM hooks.\n\nNote that post_crtc_disable() still stops all infoframes, but keeps Packet\nRAM enabled, leaving it to be disabled by runtime suspend.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/3f57b34485dc01e5a2db60a89a6ae5439a897e53","https://git.kernel.org/stable/c/6a987992c78e2e04f71e685d1c589f8ea2151fa2","https://git.kernel.org/stable/c/6b03e354526f6bad60ed3a7f08fec8b7d29d2f27"],"products":[],"source":"nvd","synced_at":"2026-10-28T11:37:51.394563875+00:00"},"epss":null,"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}