Improper input validation in Linux kernel - CVE-2026-89657
Published: September 12, 2026
Vulnerability identifier: #VU149155
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89657
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in the osd_sparse_read() sparse-read extent map handling when processing a malformed sparse-read reply. A remote user can send a malformed sparse-read reply to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89657
Install security update from vendor's repository.