Linux Kernel: Samsung Exynos clkout Driver BOUND-OUT OF BOUNDS (UBSAN) Fix
CVE-2025-71143 Published on January 14, 2026
clk: samsung: exynos-clkout: Assign .num before accessing .hws
In the Linux kernel, the following vulnerability has been resolved:
clk: samsung: exynos-clkout: Assign .num before accessing .hws
Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with
__counted_by") annotated the hws member of 'struct clk_hw_onecell_data'
with __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS)
about the number of elements in .hws[], so that it can warn when .hws[]
is accessed out of bounds. As noted in that change, the __counted_by
member must be initialized with the number of elements before the first
array access happens, otherwise there will be a warning from each access
prior to the initialization because the number of elements is zero. This
occurs in exynos_clkout_probe() due to .num being assigned after .hws[]
has been accessed:
UBSAN: array-index-out-of-bounds in drivers/clk/samsung/clk-exynos-clkout.c:178:18
index 0 is out of range for type 'clk_hw *[*]'
Move the .num initialization to before the first access of .hws[],
clearing up the warning.
Products Associated with CVE-2025-71143
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Affected Versions
Linux:- Version f316cdff8d677db9ad9c90acb44c4cd535b0ee27 and below fbf57f5e453dadadb3d29b2d1dbe067e3dc4e236 is affected.
- Version f316cdff8d677db9ad9c90acb44c4cd535b0ee27 and below eb1f3a6ab3efee2b52361879cdc2dc6b11f499c0 is affected.
- Version f316cdff8d677db9ad9c90acb44c4cd535b0ee27 and below a317f63255ebc3dac378c79c5bff4f8d0561c290 is affected.
- Version f316cdff8d677db9ad9c90acb44c4cd535b0ee27 and below cf33f0b7df13685234ccea7be7bfe316b60db4db is affected.
- Version 6.6 is affected.
- Before 6.6 is unaffected.
- Version 6.6.120, <= 6.6.* is unaffected.
- Version 6.12.64, <= 6.12.* is unaffected.
- Version 6.18.4, <= 6.18.* is unaffected.
- Version 6.19, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.