CVE-2026-89963
kernel: powerpc/kexec_file: Fix null-ptr-def in extra size calculation
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 16, 2026
Updated · October 22, 2026
Description
A flaw was found in the Linux kernel's powerpc/kexec_file component. On systems configured without reserved memory regions, a NULL pointer dereference can occur in the kexec_extra_fdt_size_ppc64() function during extra size calculation. This can lead to a kernel panic, effectively causing a denial of service (DoS) for the affected system.
CVSS score applicability
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.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 · NULL Pointer Dereference