Out-of-bounds read in Linux kernel - CVE-2026-89632
Published: September 12, 2026
Vulnerability identifier: #VU149178
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89632
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to read beyond the end of received data.
The vulnerability exists due to an out-of-bounds read in reparse_buf_ptr() when processing SMB responses with an OutputCount smaller than six bytes. A remote attacker can send an SMB response containing truncated reparse data to read beyond the end of received data.
Affected software
Linux kernel
How to mitigate CVE-2026-89632
Install security update from vendor's repository.