---
id: CVE-2026-89882
title: |-
  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) p…
summary: |-
  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) p…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c9a59dc2acc72789d5c778af080d1e65af84862c <
    74938f83a8abbee8f502dfb5d94213b2497d1edf
  - >-
    Linux >= c9a59dc2acc72789d5c778af080d1e65af84862c <
    052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3
  - Linux 7.0
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:14.850'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89882'
references:
  - url: 'https://git.kernel.org/stable/c/052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/74938f83a8abbee8f502dfb5d94213b2497d1edf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.984Z'
epss: 0.00154
epssPercentile: 0.0493
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.