CVE-2025-21747

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/ast: astdp: Fix timeout for enabling video signal<br /> <br /> The ASTDP transmitter sometimes takes up to 1 second for enabling the<br /> video signal, while the timeout is only 200 msec. This results in a<br /> kernel error message. Increase the timeout to 1 second. An example<br /> of the error message is shown below.<br /> <br /> [ 697.084433] ------------[ cut here ]------------<br /> [ 697.091115] ast 0000:02:00.0: [drm] drm_WARN_ON(!__ast_dp_wait_enable(ast, enabled))<br /> [ 697.091233] WARNING: CPU: 1 PID: 160 at drivers/gpu/drm/ast/ast_dp.c:232 ast_dp_set_enable+0x123/0x140 [ast]<br /> [...]<br /> [ 697.272469] RIP: 0010:ast_dp_set_enable+0x123/0x140 [ast]<br /> [...]<br /> [ 697.415283] Call Trace:<br /> [ 697.420727] <br /> [ 697.425908] ? show_trace_log_lvl+0x196/0x2c0<br /> [ 697.433304] ? show_trace_log_lvl+0x196/0x2c0<br /> [ 697.440693] ? drm_atomic_helper_commit_modeset_enables+0x30a/0x470<br /> [ 697.450115] ? ast_dp_set_enable+0x123/0x140 [ast]<br /> [ 697.458059] ? __warn.cold+0xaf/0xca<br /> [ 697.464713] ? ast_dp_set_enable+0x123/0x140 [ast]<br /> [ 697.472633] ? report_bug+0x134/0x1d0<br /> [ 697.479544] ? handle_bug+0x58/0x90<br /> [ 697.486127] ? exc_invalid_op+0x13/0x40<br /> [ 697.492975] ? asm_exc_invalid_op+0x16/0x20<br /> [ 697.500224] ? preempt_count_sub+0x14/0xc0<br /> [ 697.507473] ? ast_dp_set_enable+0x123/0x140 [ast]<br /> [ 697.515377] ? ast_dp_set_enable+0x123/0x140 [ast]<br /> [ 697.523227] drm_atomic_helper_commit_modeset_enables+0x30a/0x470<br /> [ 697.532388] drm_atomic_helper_commit_tail+0x58/0x90<br /> [ 697.540400] ast_mode_config_helper_atomic_commit_tail+0x30/0x40 [ast]<br /> [ 697.550009] commit_tail+0xfe/0x1d0<br /> [ 697.556547] drm_atomic_helper_commit+0x198/0x1c0<br /> <br /> This is a cosmetical problem. Enabling the video signal still works<br /> even with the error message. The problem has always been present, but<br /> only recent versions of the ast driver warn about missing the timeout.