Out-of-bounds read in Linux kernel - CVE-2026-89700
Published: September 12, 2026
Vulnerability identifier: #VU149100
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89700
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to read out-of-bounds memory.
The vulnerability exists due to improper length validation in the nfsd netlink listener_set handler when processing a netlink listener configuration containing a malformed socket address. A local privileged user can send a crafted listener configuration with a truncated AF_INET6 socket address to read out-of-bounds memory.
Exploitation requires the CAP_NET_ADMIN capability.
Affected software
Linux kernel
How to mitigate CVE-2026-89700
Install security update from vendor's repository.