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CVE-2024-56662 is an out-of-bounds read vulnerability in the Linux kernel ACPI NFIT control path. The cmd_to_func() logic can access the nd_reserved2 member of an nd_cmd_pkg structure without first confirming that the caller-supplied buffer is large enough for the complete structure. A malformed, undersized buffer can therefore cause a vmalloc out-of-bounds read and undefined kernel behavior. The flaw was detected by syzbot using KASAN.
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Linux kernel ACPI NFIT out-of-bounds read vulnerability.
Linux kernel ACPI NFIT out-of-bounds read.
A Linux kernel ACPI NFIT out-of-bounds read in acpi_nfit_ctl/cmd_to_func. An undersized or invalid buffer can be treated as struct nd_cmd_pkg and accessed through its nd_reserved2 array, causing vmalloc out-of-bounds access and undefined behavior.
A Linux kernel ACPI NFIT (NVDIMM Firmware Interface Table) out-of-bounds read vulnerability in acpi_nfit_ctl. Insufficient validation of an ioctl buffer length can cause vmalloc out-of-bounds reads, potentially exposing memory contents and causing a denial of service. Exploitation requires a process that already has root privileges because the relevant device file is root-accessible.
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