Out-of-bounds read in Linux kernel - CVE-2026-74474
Published: August 16, 2026
Vulnerability identifier: #VU143301
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-74474
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74474
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1