What’s Vulnerable › Vulnerabilities

CVE-2026-43400: drm/amdgpu: add upper bound check on user inputs in signal ioctl

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: add upper bound check on user inputs in signal ioctl Huge input values in amdgpu_userq_signal_ioctl can lead to a OOM and could be exploited. So check these input value against AMDGPU_USERQ_MAX_HANDLES which is big enough value for genuine use cases and could potentially avoid OOM. (cherry picked from commit be267e15f99bc97cbe202cd556717797cdcf79a5)

Affected products

• Linux kernel: from 6.16 before 6.18.19; from 6.19 before 6.19.9; 7.0-rc1 — fixed in 6.18.19, 6.19.9

How to fix

Upgrade to a fixed version: Linux kernel 6.18.19, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/46630d966b99b0fc6cb01fef4110587f3375a0c0
• https://git.kernel.org/stable/c/6fff5204d8aa26b1be50b6427f833bd3e8899c4f
• https://git.kernel.org/stable/c/ea78f8c68f4f6211c557df49174c54d167821962

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