drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers
In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers Three sideband reply parsers read 16-bit fields as: val = (raw->msg[idx] << 8) | (raw->msg[idx+1]); and check bounds only after the fact. When idx == raw->curlen, raw->msg[idx+1] reads one byte past the received message data into the following struct fields (curchunk_len, curchunk_idx, curlen). Affected functions: - drm_dp_sideband_parse_enum_path_resources_ack() full_payload_bw_number and avail_payload_bw_number fields - drm_dp_sideband_parse_allocate_payload_ack() allocated_pbn field - drm_dp_sideband_parse_query_payload_ack() allocated_pbn field Fix by using a single combined check (idx + 2 > curlen) before each 2-byte read. Since the check is strictly tighter than idx > curlen, no separate step is needed. [added fixes tag]
CVE-2026-68277
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:CVE-2026-68277
Kernel
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 5.10.266
Source reference:
/affected/1/ranges5.15.217Source reference:
/affected/1/ranges6.1.183Source reference:
/affected/1/ranges6.6.148Source reference:
/affected/1/ranges6.12.101Source reference:
/affected/1/ranges6.18.42Source reference:
/affected/1/ranges7.1.6Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd"
},
{
"fixed": "c1f72a13d54ffd16647d3fa540d961f5deba8790"
},
{
"fixed": "192e146c2d57ad033b0d418ec64ee390f8dc074e"
},
{
"fixed": "6e3107e6522109a07fc9bb0fc4ec463f1982e113"
},
{
"fixed": "bdf0508b1e6785d4a8982c637e97e68d60b47d7b"
},
{
"fixed": "0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df"
},
{
"fixed": "d5c70523cafa26ad2c7a37b612849abe2683baa8"
},
{
"fixed": "68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73"
},
{
"fixed": "6b89ba3dba2f583626fb693e47e951ffb8bf591f"
}
]
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68277.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "3.17.0"
},
{
"fixed": "5.10.266"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.11.0"
},
{
"fixed": "5.15.217"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.16.0"
},
{
"fixed": "6.1.183"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.148"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.101"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.42"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "7.1.6"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68277.json"
}
}
]- Related CVEs
- CVE-2026-68277
Source reference:
/id
Publisher severity
No explicit severity was provided.
- Event
- #50856 · Revision 1
- Added to Heist Feed
- Publisher date