CVE-2024-56677

A flaw was found in the fadump (firmware-assisted dump) memory reservation logic in the PowerPC architecture of the Linux kernel. The fadump_cma_init() function was called too early during system initialization, before proper memory alignment parameters were established. As a result, reserved CMA memory could bypass alignment checks, leading to violations such as pageblock misalignment. This could trigger kernel panics or crashes later in the boot process, notably with VM_BUG_ON_PAGE assertions. A local attacker or misconfigured system could exploit this issue to cause a denial of service during system boot, affecting system availability.

The bug is specific for PowerPC platform and can happen during initialization (ex. during boot time). The security impact is limited, because bug detected by VM_BUG_ON_PAGE correctly.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.