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CVE-2026-68257: drm/amdkfd: fix 32-bit overflow in CWSR total size calculation

• Severity: high (CVSS 7.8 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: 2026-08-10 · updated 2026-10-19
• Weakness: CWE-190

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix 32-bit overflow in CWSR total size calculation total_cwsr_size was computed in 32-bit before being used as a BO/SVM allocation size. With large ctx_save_restore_area_size and debug_memory_size multiplied by the XCC count, the product can wrap, yielding an undersized CWSR save area that firmware later overruns. Promote total_cwsr_size to u64 and use check_add_overflow()/ check_mul_overflow() in both kfd_queue_acquire_buffers() and kfd_queue_release_buffers(). (cherry picked from commit 319f7e13423ae3f486b9aea82f9ad2d6af0ee608)

Affected products

• Linux kernel: from 6.12.59 before 6.12.101; from 6.17.9 before 6.18; 6.18 — fixed in 6.12.101, 6.18, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.12.101, 6.18, 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2b0386d4293920e690c0e017708f999b93cc729b
• https://git.kernel.org/stable/c/865532d54eb57b660b1cb1b0e1755776ce21b849
• https://git.kernel.org/stable/c/abce3276c57e36c955627307469b9f009057a467
• https://git.kernel.org/stable/c/b88ffe6593607364a8c06a48c6f29e55437cdf8e

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