{"id":"DEBIAN-CVE-2026-68278","details":"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 \u003e= 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.","modified":"2026-09-08T17:00:25.404501122Z","published":"2026-08-10T13:20:16.920Z","upstream":["CVE-2026-68278"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-68278"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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