CVE-2026-93263
Summary
by MITRE • 09/24/2026
In the Linux kernel, the following vulnerability has been resolved:
clk: eswin: Zero-initialize stack-allocated clk_init_data
eswin_clk_register_pll() and eswin_register_clkdiv() declare a struct clk_init_data on the stack and only initialize some of its fields (parent_data respectively parent_hws). clk_core_populate_parent_map() checks parent_names first and parent_data second before falling back to parent_hws, so leftover stack garbage in the uninitialized fields hijacks parent resolution and the clk core dereferences a bogus pointer:
Unable to handle kernel NULL pointer dereference at virtual address 000000000000000c Oops [#1]
epc : __clk_register+0x31a/0x7f0 [] __clk_register+0x31a/0x7f0
[] devm_clk_hw_register+0x2a/0x94
[] eswin_register_clkdiv+0x80/0xd0
[] eswin_clk_register_clks+0x162/0x1a0
[] eic7700_clk_probe+0x146/0x180
[] platform_probe+0x3c/0x7a
Observed on EIC7700 hardware (with the driver backported to a 6.17 tree); whether the bug triggers depends entirely on what the stack happens to contain when the registration helpers run.
Zero-initialize both structures.
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