NULL pointer dereference in Linux kernel - CVE-2026-99166
Published: October 29, 2026
Vulnerability identifier: #VU158411
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99166
CWE-ID: CWE-476
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 crashing the Linux kernel.
The vulnerability exists due to a null pointer dereference in the RDS RDMA connection event handler when processing a resolved route for an outgoing connection bound to an iWARP device. A local user can initiate an RDS connection whose local address resolves to an iWARP device to reach a write through the unset cm_id->route.path_rec pointer and crash the kernel.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99166
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2