CVE-2026-43129

Description

In the Linux kernel, the following vulnerability has been resolved: ima: verify the previous kernel-s IMA buffer lies in addressable RAM Patch series -Address page fault in ima_restore_measurement_list()-, v3. When the second-stage kernel is booted via kexec with a limiting command line such as -mem=<size>- we observe a pafe fault that happens. BUG: unable to handle page fault for address: ffff97793ff47000 RIP: ima_restore_measurement_list+0xdc/0x45a #PF: error_code(0x0000) not-present page This happens on x86_64 only, as this is already fixed in aarch64 in commit: cbf9c4b9617b (-of: check previous kernel-s ima-kexec-buffer against memory bounds-) This patch (of 3): When the second-stage kernel is booted with a limiting command line (e.g. -mem=<size>-), the IMA measurement buffer handed over from the previous kernel may fall outside the addressable RAM of the new kernel. Accessing such a buffer can fault during early restore. Introduce a small generic helper, ima_validate_range(), whic...