Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: media: rkvdec: hevc: guard INTER_REF_PIC_SET_PRED index underflow st_ref_pic_set_prediction() computes the reference RPS index as st_rps_idx - (delta_idx_minus1 + 1) per HEVC spec equation 7-59. Both operands are u8, so when delta_idx_minus1 + 1 exceeds the current index the subtraction wraps and the subsequent array access at calculated_rps_st_sets[ref_rps_idx] reads far out of bounds. A userspace V4L2 client that can open the RKVDEC m2m decoder can submit an EXT_SPS_ST_RPS control with INTER_REF_PIC_SET_PRED set and delta_idx_minus1 crafted to trigger the underflow. Reject the entry early when the reference index would underflow.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c9a59dc2acc72789d5c778af080d1e65af84862c before 74938f83a8abbee8f502dfb5d94213b2497d1edf; affected c9a59dc2acc72789d5c778af080d1e65af84862c before 052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3 |
| Linux / Linux | affected 7.0; unaffected 0 before 7.0; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.