In the Linux kernel, the following vulnerability has been resolved:

regmap: maple: Fix cache corruption in regcache_maple_drop()

When keeping the upper end of a cache block entry, the entry[] array
must be indexed by the offset from the base register of the block,
i.e. max - mas.index.

The code was indexing entry[] by only the register address, leading
to an out-of-bounds access that copied some part of the kernel
memory over the cache contents.

This bug was not detected by the regmap KUnit test because it only
tests with a block of registers starting at 0, so mas.index == 0.

kernel.org https://git.kernel.org/stable/c/00bb549d7d63a21532e76e4a334d7807a54d9f31 [No types assigned]

kernel.org https://git.kernel.org/stable/c/3af6c5ac72dc5b721058132a0a1d7779e443175e [No types assigned]

kernel.org https://git.kernel.org/stable/c/51c4440b9d3fd7c8234e6de9170a487c03506e53 [No types assigned]