Riskcovery

CVE-2026-89882

media: rkvdec: hevc: guard INTER_REF_PIC_SET_PRED index underflow

State
Published
Severity
7.8 High
Published
Sep 16, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • c9a59dc2acc72789d5c778af080d1e65af84862c to before 74938f83a8abbee8f502dfb5d94213b2497d1edfAffected
  • c9a59dc2acc72789d5c778af080d1e65af84862c to before 052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3Affected
LinuxLinux
  • 7.0Affected
  • before 7.0Not affected
  • 7.2.5 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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