CVE-2026-68257

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b88ffe6593607364a8c06a48c6f29e55437cdf8eaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < abce3276c57e36c955627307469b9f009057a467affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 865532d54eb57b660b1cb1b0e1755776ce21b849affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2b0386d4293920e690c0e017708f999b93cc729baffected
LinuxLinux0 < 6.12.101affected
LinuxLinux0 < 6.18.42affected
LinuxLinux0 < 7.1.6affected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc4 <= *unaffected

Weaknesses

References