SB20260928232 - Use of Uninitialized Variable in Linux kernel net vxlan driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use of Uninitialized Variable (CVE-ID: CVE-2026-97965)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to disclose uninitialized kernel stack data.

The vulnerability exists due to use of an uninitialized stack variable in vxlan_xmit_one() when transmitting a packet through a VXLAN device using external tunnel information that lacks the IP_TUNNEL_VXLAN_OPT_BIT flag. A local privileged user can transmit such a packet to disclose uninitialized kernel stack data.

The VXLAN device must be configured with both VXLAN_F_COLLECT_METADATA and VXLAN_F_GBP.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/081f22177d9d12b1e381b787f203cd5f47508187
• https://git.kernel.org/stable/c/0d13b5a413bffc8718b3821b78537ccc6596c233
• https://git.kernel.org/stable/c/be83178bfc44588f6e3adb827ed874c683193466
• https://git.kernel.org/stable/c/bfb74c48ac2d31476d5e09cf9658844508d2608a