Incorrect calculation in Linux kernel - CVE-2026-89962

Vulnerability identifier: #VU150328

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-89962

CWE-ID: CWE-682

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to cause data corruption or crashes.

The vulnerability exists due to incorrect range-merging logic in the powerpc kexec memory-range handling code when merging overlapping memory ranges for a kexec operation. A local privileged user can trigger a kexec operation with overlapping memory ranges to cause data corruption or crashes.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/9ef63622e6cee588ea4b763a6afc87065254b36a
• https://git.kernel.org/stable/c/c4cb547f26d9b73b489c5278d0c8db837c5a174f
• https://git.kernel.org/stable/c/da88a2a2119e4fd0e8919a7a2448682f574e1545
• https://git.kernel.org/stable/c/fa40f9dbdd4af53e7445d9135b5b207eb8adf372

• Incorrect calculation in Linux kernel powerpc kexec
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more