Linux Kernel up to 7.2.4 HEVC Control Validation v4l2-ctrls.c v4l2-ctrls out-of-bounds

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.2.4. This affects the function v4l2-ctrls of the file v4l2-ctrls.c of the component HEVC Control Validation. Performing a manipulation results in out-of-bounds. This vulnerability was named CVE-2026-89873. The attack needs to be approached locally. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.4. This affects the function v4l2-ctrls of the file v4l2-ctrls.c of the component HEVC Control Validation. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-ctrls: validate HEVC EXT SPS RPS counts The HEVC SPS control carries the short-term and long-term RPS counts that decoder drivers use to walk the matching EXT SPS dynamic arrays. Reject SPS values that exceed the HEVC limits of 64 short-term sets and 32 long-term references so drivers cannot later index beyond those controls. Also reject EXT SPS ST RPS entries whose negative or positive picture counts exceed the 16-entry arrays, or whose combined delta-POC count exceeds the HEVC DPB maximum.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-89873 since 09/11/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/16/2026).

Upgrading to version 7.2.5 or 7.3-rc1 eliminates this vulnerability. Applying the patch 30f85a7c59113a8844b276efc010085a34f912e9/796b5c6d4f1615d59d5d8fe5a38fae6bfdfe878e is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

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