What’s Vulnerable › Vulnerabilities

CVE-2025-40191: drm/amdkfd: Fix kfd process ref leaking when userptr unmapping

• Severity: unknown
• 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: 2025-11-12 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix kfd process ref leaking when userptr unmapping kfd_lookup_process_by_pid hold the kfd process reference to ensure it doesn't get destroyed while sending the segfault event to user space. Calling kfd_lookup_process_by_pid as function parameter leaks the kfd process refcount and miss the NULL pointer check if app process is already destroyed.

Affected products

• Linux kernel: 6.16 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/58e6fc2fb94f0f409447e5d46cf6a417b6397fbc
• https://git.kernel.org/stable/c/60f6112fc9b3ba0eae519f10702c0c13bab45742

Get alerted when CVE-2025-40191 or the next vulnerability affects your stack