Out-of-bounds read in Linux kernel - CVE-2026-89882

Vulnerability identifier: #VU150405

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-89882

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to read out-of-bounds memory.

The vulnerability exists due to an integer underflow in the HEVC reference picture set prediction handling of the RKVDEC decoder when processing an EXT_SPS_ST_RPS control with INTER_REF_PIC_SET_PRED set. A local user can submit a crafted control with a delta_idx_minus1 value that causes the reference picture set index to underflow to read out-of-bounds memory.

The affected decoder is accessible through the V4L2 memory-to-memory interface.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3
• https://git.kernel.org/stable/c/74938f83a8abbee8f502dfb5d94213b2497d1edf

• Out-of-bounds read in Linux kernel rockchip rkvdec driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more