Kernel memory overwrite via oversized AV1 tile grid
Published Sep 25, 2026 · Updated Sep 25, 2026
Out-of-bounds write in the Linux kernel 6.5 VPU981 AV1 decoder allows local users to overrun a DMA tile buffer via a crafted bitstream. The rockchip_vpu981_av1_dec_set_tile_info() function divides context_update_tile_id by an untrusted tile_cols value and writes one descriptor per claimed tile without respecting the AV1_MAX_TILES buffer capacity. Exploitation requires access to the VPU981 AV1 decode path on Rockchip hardware; the published material does not establish whether the fault causes a kernel crash or adjacent-memory corruption.
Summary
What happened
Out-of-bounds write in the Linux kernel 6.5 VPU981 AV1 decoder allows local users to overrun a DMA tile buffer via a crafted bitstream. The rockchip_vpu981_av1_dec_set_tile_info() function divides context_update_tile_id by an untrusted tile_cols value and writes one descriptor per claimed tile without respecting the AV1_MAX_TILES buffer capacity. Exploitation requires access to the VPU981 AV1 decode path on Rockchip hardware; the published material does not establish whether the fault causes a kernel crash or adjacent-memory corruption.
The record
- CVE
- CVE-2026-97578
- Published
- Sep 25, 2026
- Updated
- Sep 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 25, 2026CVE publishedPublication date reported by the CVE source.
- Sep 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=6.5
- Affected versionversion=727a400686a2c0d25015c9e44916a59b72882f83 <6b7a281a815ae7c5e7bb2aad039ffea9bc933157
- Affected versionversion=727a400686a2c0d25015c9e44916a59b72882f83 <7baa7bb1b784c19170df8c99466fa412040eb431
- Affected versionversion=727a400686a2c0d25015c9e44916a59b72882f83 <8f19d869a9f6800547c9ad7ebaf3b94f973dab50
- Affected versionversion=727a400686a2c0d25015c9e44916a59b72882f83 <b84f6533a8ed2fd7b282fc7ab4b8efadc745a89c
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
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Public exploit references
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Technologies
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