Out-of-bounds read in Linux kernel - CVE-2026-90170
Published: September 19, 2026
Vulnerability identifier: #VU151314
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90170
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to read memory out of bounds.
The vulnerability exists due to an out-of-bounds read in the ksmbd ipc_validate_msg() function when processing undersized IPC responses supplied by the userspace ksmbd daemon. A local user can provide a short IPC response to read memory out of bounds.
The issue is reachable for KSMBD_EVENT_RPC_REQUEST messages.
Affected software
Linux kernel
How to mitigate CVE-2026-90170
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/0aa8f94bfd4d818284c8a7ce0040d40ca1ec3595
- https://git.kernel.org/stable/c/17b7d1a2b4d5473df5dca8c9a07d65021806c23a
- https://git.kernel.org/stable/c/398cba4b646a6c08ff3d79e6b1e70e5ddae8a065
- https://git.kernel.org/stable/c/c494fcf8e89e3c970e13d78ebe62bf5d8f2b1c52
- https://git.kernel.org/stable/c/e9b33376bd07bca4175f7bcc2d6034ef250f8181