CVE-2024-36019 Information

Description

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.

Reference

https://git.kernel.org/stable/c/3af6c5ac72dc5b721058132a0a1d7779e443175e https://git.kernel.org/stable/c/51c4440b9d3fd7c8234e6de9170a487c03506e53 https://git.kernel.org/stable/c/00bb549d7d63a21532e76e4a334d7807a54d9f31