Out-of-bounds write in Linux kernel - CVE-2026-89602
Published: September 12, 2026
Vulnerability identifier: #VU149195
CSH Severity: Low
CVSS v4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89602
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause memory corruption.
The vulnerability exists due to an out-of-bounds write in the z_erofs_gbuf_growsize() global-buffer resizing function when retrying a global-buffer resize with an intermediate size after a partial resize. A local privileged user can trigger a resize retry using an intermediate size to cause memory corruption.
The issue requires some global buffers to have been enlarged by a previous resize attempt.
Affected software
Linux kernel
How to mitigate CVE-2026-89602
Install security update from vendor's repository.