SB20260816237 - Out-of-bounds read in Linux kernel net vxlan driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-74474)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the vxlan transmit path header handling in vxlan_xmit(), arp_reduce(), and vxlan_mdb_entry_skb_get() when processing crafted socket buffers. A local user can provide a specially crafted skb layout to cause a denial of service.

The issue occurs because network-layer header availability is checked without accounting for the MAC header offset during transmit processing.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7076a34b6e33315dc160b4612bfea1c597495585
• https://git.kernel.org/stable/c/94dee751aad627b3645d424b5d0c736d394573e9
• https://git.kernel.org/stable/c/b9553558b48db54ac9273e6b98d7263ef5c1a329