Use-after-free in Linux kernel - CVE-2026-98122
Published: September 28, 2026
Vulnerability identifier: #VU152324
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98122
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to a use-after-free in vxlan_mdb_remote_src_del() when processing VXLAN MDB updates containing an all-zeros source address. A local user can submit crafted VXLAN MDB entries to compromise confidentiality, integrity, and availability.
MDB operations are network-namespace scoped and can be performed in a new user and network namespace.
Affected software
Linux kernel
How to mitigate CVE-2026-98122
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3