What’s Vulnerable › Vulnerabilities

CVE-2025-21842: amdkfd: properly free gang_ctx_bo when failed to init user queue

• Severity: medium (CVSS 5.5 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: 2025-03-07 · updated 2026-07-30

Description

In the Linux kernel, the following vulnerability has been resolved: amdkfd: properly free gang_ctx_bo when failed to init user queue The destructor of a gtt bo is declared as void amdgpu_amdkfd_free_gtt_mem(struct amdgpu_device *adev, void **mem_obj); Which takes void** as the second parameter. GCC allows passing void* to the function because void* can be implicitly casted to any other types, so it can pass compiling. However, passing this void* parameter into the function's execution process(which expects void** and dereferencing void**) will result in errors.

Affected products

• Linux kernel: from 6.12 before 6.12.16; from 6.13 before 6.13.4; 6.14-rc1, 6.14-rc2 — fixed in 6.12.16, 6.13.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.16, 6.13.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/091a68c58c1bbd2ab7d05d1b32c1306394ec691d
• https://git.kernel.org/stable/c/a33f7f9660705fb2ecf3467b2c48965564f392ce
• https://git.kernel.org/stable/c/ae5ab1c1ae504f622cc1ff48830a9ed48428146d

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