CVE-2026-89882

7.8 HIGH

Published 2026-09-16 · Updated 2026-09-16

AI risk analysis

Summary: This vulnerability allows a userspace client to trigger an out-of-bounds array access in the Linux kernel's HEVC decoder, potentially leading to a denial of service or other kernel crashes.
Exploitability: Exploitation requires a userspace V4L2 client capable of submitting crafted control commands, making it moderately difficult to exploit.
Blast radius: If exploited, the impact is limited to the affected system, potentially causing a denial of service for the video decoding service.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the latest kernel version that includes this fix, such as 'Upgrade to 5.19.0 or later'.

doskernelvideo-decoding

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.