SB2026091707 - NULL pointer dereference in Linux kernel powerpc kexec
Published: September 17, 2026
Security Bulletin ID
SB2026091707
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-89963)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in kexec_extra_fdt_size_ppc64() when calculating extra FDT size during kexec file loading on a platform without reserved memory regions. A local privileged user can invoke kexec file loading to cause a denial of service.
Remediation
Install update from vendor's website.