CVE-2026-68278
Low risk· EPSS 14%Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
In the Linux kernel, the function drm_dp_sideband_append_payload() in drm/dp/mst has three buffer overflow bugs: curchunk_len underflow when msg_len=0, overflow of the chunk[48] buffer, and overflow of the msg[256] buffer. These are reachable from any DP MST device that can forge sideband replies.
Risk Assessment
The vulnerability can lead to out-of-bounds memory writes, potentially causing system crashes, privilege escalation, or remote code execution in kernel context.
Recommendation
Apply the Linux kernel patch that fixes all three buffer overflow bugs in drm_dp_sideband_append_payload().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix buffer overflows in sideband chunk accumulation drm_dp_sideband_append_payload() has three related bugs when processing device-provided sideband reply data: 1. Zero-length curchunk_len underflow: msg_len is a 6-bit field taken directly from the DP sideband header. If a device sends msg_len=0, curchunk_len is set to zero. The condition (curchunk_idx >= curchunk_len) is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow). drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy() writes 255 bytes into msg[], both far out of bounds. 2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks until curchunk_idx reaches curchunk_len, writing up to 15 bytes past the end of chunk[] into msg[]. 3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256], so the memcpy can spill into adjacent struct fields. All three are reachable from any DP MST device that can forge sideband reply messages on a physical connection.