SB2026091978 - Memory leak in Linux kernel vmw_vsock

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2026-90138)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

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 remote attacker to cause a resource leak.

The vulnerability exists due to improper socket error handling in vsock_accept() when accepting a connection after a failed connection attempt on the listener. A remote attacker can perform a failed self-connect and then accept a valid incoming vsock connection to cause a resource leak.

The leak affects virtio and hyperv transports because rejected child sockets are not freed.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/36e5fa009f98a4edbe1783ac11c0df672b224742
• https://git.kernel.org/stable/c/491b368a0c6e5f28b615a50b0d384f5c25fde2a7
• https://git.kernel.org/stable/c/b8c899cf5e7be29840a172c183dedd8d3e7a0287
• https://git.kernel.org/stable/c/c5a75d37c21e558cc6fad1597e732ead30745eed