Origin validation error in Linux kernel - CVE-2026-99122
Published: October 29, 2026
Vulnerability identifier: #VU158476
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99122
CWE-ID: CWE-346
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to reset VMCI socket connections and cause a denial of service.
The vulnerability exists due to missing packet source validation in the Linux kernel VMCI vsock receive paths when a destination-only lookup selects a non-listening socket without verifying that the packet originated from its stored peer. A local user can send a crafted RST packet from a different VMCI context to reset a socket in the TCP_SYN_SENT state.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99122
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.117-1
linux (Debian package) - update to 6.12.117-1