CVE-2026-99123
kernel: kernel: connection hijacking via missing packet source validation in virtio vsock
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 28, 2026
Updated · November 1, 2026
Description
A flaw was found in the Linux kernel's Virtual Sockets (vsock) virtio transport. Incoming packets for connecting sockets are not properly validated against their expected source address. A local, unprivileged attacker can exploit this vulnerability by sending crafted packets during connection setup to hijack the socket. Successful exploitation allows unauthorized data injection and disrupts communication between legitimate endpoints.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 3.6CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
CWE-940 · Improper Verification of Source of a Communication Channel