Memory corruption in Linux kernel - CVE-2026-89718
Published: September 12, 2026
Vulnerability identifier: #VU149089
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89718
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to access slots outside of table bounds.
The vulnerability exists due to improper synchronization in writeback_store() when a device is reset and reconfigured with a smaller disksize while writeback_store() is waiting to acquire dev_lock. A local privileged user can reset and reconfigure the device with a smaller disksize during the lock acquisition to access slots outside of table bounds.
Affected software
Linux kernel
How to mitigate CVE-2026-89718
Install security update from vendor's repository.