Incorrect Conversion between Numeric Types in Linux kernel - CVE-2026-89490
Published: September 12, 2026
Vulnerability identifier: #VU149323
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89490
CWE-ID: CWE-681
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service by triggering indefinite directory re-enumeration.
The vulnerability exists due to an incorrect integer conversion in ocfs2_dir_foreach_blk_el() when reading a non-inline directory that crosses the 4 GiB boundary on a 32-bit kernel. A local user can invoke readdir() on an affected directory to cause a denial of service by triggering indefinite directory re-enumeration.
64-bit kernels are unaffected.
Affected software
Linux kernel
How to mitigate CVE-2026-89490
Install security update from vendor's repository.