CVE-2026-68235

CVE CVE-2026-68235EUVD EUVD-2026-55336Published 2026-08-10T12:01:00.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: dce100: skip non-DP stream encoders for DP MST On DCE8-class ASICs (e.g. Bonaire), the resource pool contains digital DIG stream encoders plus one analog DAC encoder. When assigning a stream encoder for a second DisplayPort MST stream, if the preferred digital encoder is already acquired, dce100_find_first_free_match_stream_enc_for_link() falls back to the first free pool entry. That entry may be the analog encoder, whose funcs table lacks DP hooks such as dp_set_stream_attribute. The subsequent atomic commit then dereferences NULL function pointers in link_set_dpms_on() and crashes. Skip encoders without dp_set_stream_attribute when the stream uses a DP signal (including MST). Use dc_is_dp_signal(stream->signal) for the MST fallback path instead of checking only the link connector signal. Tested on: - GPU: AMD Radeon R7 260X (Bonaire / DCE8) - Board: Supermicro C9X299-PG300 - Setup: DP MST daisy chain, hotplug second monitor or have it connected on boot - Kernel: 7.1.3 (issue observed since 6.19) - Result: kernel oops without patch; dual monitors stable with patch (cherry picked from commit 28ec64943e3ee4d9b8d30cea61e380f1429953a8)

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d340cba0df4cf327c7e89c7c1a4e79d4771d7dd5; 0 <6.18.42; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bfe28ce019c2d667d98071262da33d8bba122919; patch: 6.18.42; 0 <7.1.6; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ed2d86aef9fa4c43f82da0fca91a60f7326d7d03; 0 <6.12.101; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <51ea665c30c424c98959101f3bf6f48ab42949c8; patch: 6.12.101; patch: 7.2-rc4; patch: 7.1.6

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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