Description (CNA)
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]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd before c1f72a13d54ffd16647d3fa540d961f5deba8790; affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd before 192e146c2d57ad033b0d418ec64ee390f8dc074e; affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd before 6e3107e6522109a07fc9bb0fc4ec463f1982e113; affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd before bdf0508b1e6785d4a8982c637e97e68d60b47d7b; affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd before 0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df; affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd before d5c70523cafa26ad2c7a37b612849abe2683baa8; affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd before 68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73; affected ad7f8a1f9ced7f049f9b66d588723f243a7034cd before 6b89ba3dba2f583626fb693e47e951ffb8bf591f |
| Linux / Linux | affected 3.17; unaffected 0 before 3.17; unaffected 5.10.266 through 5.10.*; unaffected 5.15.217 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c1f72a13d54ffd16647d3fa540d961f5deba8790
- https://git.kernel.org/stable/c/192e146c2d57ad033b0d418ec64ee390f8dc074e
- https://git.kernel.org/stable/c/6e3107e6522109a07fc9bb0fc4ec463f1982e113
- https://git.kernel.org/stable/c/bdf0508b1e6785d4a8982c637e97e68d60b47d7b
- https://git.kernel.org/stable/c/0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df
- https://git.kernel.org/stable/c/d5c70523cafa26ad2c7a37b612849abe2683baa8
- https://git.kernel.org/stable/c/68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73
- https://git.kernel.org/stable/c/6b89ba3dba2f583626fb693e47e951ffb8bf591f