CVE-2026-89963

Summary

In the Linux kernel, the following vulnerability has been resolved:

powerpc/kexec_file: Fix null-ptr-def in extra size calculation

A static Sashiko AI review identified a potential NULL pointer dereference in kexec_extra_fdt_size_ppc64().

On platforms without any reserved memory regions, get_reserved_memory_ranges() can return 0 while leaving 'rmem' unallocated as NULL. Passing it directly leads to a kernel panic when evaluating 'rmem->nr_ranges'.

Add a NULL check for 'rmem' to prevent this crash.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0d3ff067331ef84e7e7f49537d768881042ed5ba < 11ef1c2a5dbe0bd8c1345f59bab7331d352f02cfaffected
LinuxLinux0d3ff067331ef84e7e7f49537d768881042ed5ba < df45337587db21c502fe5251d3bcc7887428f4fbaffected
LinuxLinux0d3ff067331ef84e7e7f49537d768881042ed5ba < 4ff3d9fd71c7bc2fc81afdac1970d9c55a5c0deaaffected
LinuxLinux0d3ff067331ef84e7e7f49537d768881042ed5ba < 761eda315a6e1fda3e8e2185b28430771fb1ac29affected
LinuxLinux6.11affected
LinuxLinux0 < 6.11unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References