SB20261029201 - Origin validation error in Linux kernel vmw_vsock

Description

This security bulletin contains information about 1 vulnerability.

1) Origin validation error (CVE-ID: CVE-2026-99122)

CWE-ID: CWE-346 - Origin Validation Error

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/90c423b62ec9be08177f74b07a47937ca8d2035b
• https://git.kernel.org/stable/c/ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7
• https://git.kernel.org/stable/c/c027f8b429dbb2157fc1b503df196e272d947c89