kho: skip KHO for crash kernel

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Summary

CVECVE-2026-64167
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:58 UTC
Updated2026-07-19 16:17:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: kho: skip KHO for crash kernel kho_fill_kimage() unconditionally populates the kimage with KHO metadata for every kexec image type. When the image is a crash kernel, this can be problematic as the crash kernel can run in a small reserved region and the KHO scratch areas can sit outside it. The crash kernel then faults during kho_memory_init() when it tries phys_to_virt() on the KHO FDT address: Unable to handle kernel paging request at virtual address xxxxxxxx ... fdt_offset_ptr+... fdt_check_node_offset_+... fdt_first_property_offset+... fdt_get_property_namelen_+... fdt_getprop+... kho_memory_init+... mm_core_init+... start_kernel+... kho_locate_mem_hole() already skips KHO logic for KEXEC_TYPE_CRASH images, but kho_fill_kimage() was missing the same guard. As kho_fill_kimage() is the single point that populates image->kho.fdt and image->kho.scratch, fixing it here is sufficient for both arm64 and x86 as the FDT and boot_params path are bailing out when these fields are unset.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d7255959b69a4e727c61eb04231d11390d4f391e a6ac6721326a75ff2d14c68db05f93b576d8762f git Not specified
CNA Linux Linux affected d7255959b69a4e727c61eb04231d11390d4f391e a6715d7ec472a476db17787697a4abda62962284 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a6715d7ec472a476db17787697a4abda62962284 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6ac6721326a75ff2d14c68db05f93b576d8762f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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