CVE-2026-99214— Broadcom VC4 HDMI 电源管理漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
在 Linux 内核中，以下漏洞已得到修复： drm/vc4: hdmi：将数据包 RAM 的启用操作移至运行时电源管理（Runtime PM）流程中 当热插拔检测（HPD）处理程序触发音频功能时，音频可能在视频尚未恢复之前就开始运行，并调用 来写入音频信息帧（infoframe）。该函数需要数据包 RAM（Packet RAM）处于启用状态，以便存储信息帧。然而，如果视频尚未启用，则 尚未被调用，导致在 执行时，数据包 RAM 可能已被禁用，从而引发以下内核警告（splat）： 考虑到数据包 RAM 的启用本质上
可能的 ATT&CK 技术 1 AI
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一、 漏洞 CVE-2026-99214 基础信息
漏洞信息
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Vulnerability Title
drm/vc4: hdmi: Move packet RAM enable to PM runtime
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
drm/vc4: hdmi: Move packet RAM enable to PM runtime
Audio can be triggered by the HPD handler and start up before video has
been restored, calling vc4_hdmi_write_infoframe() for the audio infoframe.
vc4_hdmi_write_infoframe() needs Packet RAM to be on to store the
infoframe, however, if the video hasn't been enabled,
vc4_hdmi_encoder_post_crtc_enable() hasn't been called and therefore, the
Packet RAM can be disabled by the time vc4_hdmi_write_infoframe() executes,
causing the following splat:
[ 201.570266] ------------[ cut here ]------------
[ 201.570293] Packet RAM has to be on to store the packet.
[ 201.570367] WARNING: drivers/gpu/drm/vc4/vc4_hdmi.c:683 at vc4_hdmi_write_infoframe+0x404/0x494 [vc4], CPU#0: wireplumber/1606
[...]
[ 201.658650] Hardware name: Raspberry Pi 4 Model B Rev 1.5 (DT)
[...]
[ 201.758499] Call trace:
[ 201.760967] vc4_hdmi_write_infoframe+0x404/0x494 [vc4] (P)
[ 201.766607] vc4_hdmi_write_audio_infoframe+0x1c/0x28 [vc4]
[ 201.772247] write_infoframe+0xbc/0x140 [drm_display_helper]
[ 201.777975] drm_atomic_helper_connector_hdmi_update_audio_infoframe+0x80/0xdc [drm_display_helper]
[ 201.787140] vc4_hdmi_audio_prepare+0x4ac/0x570 [vc4]
[ 201.792252] drm_connector_hdmi_audio_prepare+0x24/0x30 [drm_display_helper]
[ 201.799390] hdmi_codec_prepare+0x100/0x160 [snd_soc_hdmi_codec]
[ 201.805471] snd_soc_pcm_dai_prepare+0xd4/0x100 [snd_soc_core]
[ 201.811375] __soc_pcm_prepare+0x60/0x12c [snd_soc_core]
[ 201.816752] soc_pcm_prepare+0x34/0x58 [snd_soc_core]
[ 201.821863] snd_pcm_do_prepare+0x70/0x8c [snd_pcm]
[ 201.826798] snd_pcm_action_nonatomic+0xe4/0x174 [snd_pcm]
[ 201.832350] snd_pcm_prepare+0xc8/0xd8 [snd_pcm]
[ 201.837021] snd_pcm_common_ioctl+0x458/0x614 [snd_pcm]
[ 201.842308] snd_pcm_ioctl+0x30/0x48 [snd_pcm]
[ 201.846802] __arm64_sys_ioctl+0x88/0xd8
[ 201.850769] invoke_syscall+0x48/0xf4
[ 201.854470] el0_svc_common+0x80/0xd8
[ 201.858171] do_el0_svc+0x1c/0x28
[ 201.861520] el0_svc+0x3c/0xb0
[ 201.864605] el0t_64_sync_handler+0x68/0xdc
[ 201.868834] el0t_64_sync+0x198/0x19c
[ 201.872536] ---[ end trace 0000000000000000 ]---
Considering that Packet RAM enable is essentially a power management
configuration, move its enabling/disabling to the Runtime PM hooks.
Note that post_crtc_disable() still stops all infoframes, but keeps Packet
RAM enabled, leaving it to be disabled by runtime suspend.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-99214 的公开POC
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|---|
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CVE-2026-99214 补丁与修复 (3)
同批安全公告 · Linux · 2026-10-28 · 共 117 条
| CVE-2026-99143 | Linux 内核 tracing 组件越界访问漏洞 | |
| CVE-2026-99129 | SELinux BPF 令牌权限检查漏洞 | |
| CVE-2026-99130 | Linux io_uring 拒绝服务漏洞 | |
| CVE-2026-99131 | XFS 文件系统权限检查绕过漏洞 | |
| CVE-2026-99133 | Linux 内核网络 IUCV 远程拒绝服务漏洞 | |
| CVE-2026-99132 | XFS xfs_sync_sb_buf 缓冲区锁竞争漏洞 | |
| CVE-2026-99134 | mac802154 数据竞争与空指针解引用漏洞 | |
| CVE-2026-99135 | dm-integrity 大标签丢弃无限循环漏洞 | |
| CVE-2026-99137 | CIFS 文件系统在无缓存句柄时更新 i_size 存在漏洞 | |
| CVE-2026-99136 | dm-crypt 竞态条件漏洞 | |
| CVE-2026-99138 | Linux TCP 协议栈 use-after-free 漏洞 | |
| CVE-2026-99140 | tracing 模块缓冲区事件时间戳修复 | |
| CVE-2026-99139 | TCP 协议栈 TCP_CONGESTION 选项后释放漏洞 | |
| CVE-2026-99141 | 内核 tracing 模块 print_graph_function_event 崩溃漏洞 | |
| CVE-2026-99142 | Tracing 组件栈容量检查缺失漏洞 | |
| CVE-2026-99154 | libiscsi 负任务索引拒绝漏洞 | |
| CVE-2026-99151 | AMD Display 驱动 NULL 指针解引用漏洞 | |
| CVE-2026-99153 | libiscsi 拒绝 PDU 验证逻辑漏洞 | |
| CVE-2026-99152 | libiscsi 管理响应任务验证绕过漏洞 | |
| CVE-2026-99150 | amdgpu 驱动程序资源管理漏洞 |
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