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CVE-2026-89825: drm/panthor: fix firmware control interface bounds checks

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: drm/panthor: fix firmware control interface bounds checks panthor_init_cs_iface() and panthor_init_csg_iface() validate firmware control interface offsets with 32-bit arithmetic and the size of the host wrapper structures. The offsets are derived from firmware-provided strides, so the arithmetic can wrap before the bounds check, and the host wrapper size is not the size of the firmware control interface being mapped. Use 64-bit arithmetic for the computed offsets and validate against the actual firmware control interface structure sizes with subtraction-based bounds checks. Also validate that the shared section is large enough for the global control interface before using it.

Affected products

• Linux kernel: 6.10 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/33ae55809aee9b4dca1d00cdee35b527f2bf8626
• https://git.kernel.org/stable/c/3e5c7cddc0073eef6f9bb373189b11a969f1f6f6
• https://git.kernel.org/stable/c/6a47f9fd2d970674ed9dedc52fc7ab76fd015785
• https://git.kernel.org/stable/c/80c9528661c774f899281c9a72011208ff39929e

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