Out-of-bounds Read Affecting kernel-rt-debug-kvm package, versions *

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

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.

• https://access.redhat.com/security/cve/CVE-2024-36019
• https://git.kernel.org/stable/c/00bb549d7d63a21532e76e4a334d7807a54d9f31
• https://git.kernel.org/stable/c/3af6c5ac72dc5b721058132a0a1d7779e443175e
• https://git.kernel.org/stable/c/51c4440b9d3fd7c8234e6de9170a487c03506e53