SB2026082892 - Use-after-free in Linux kernel net vxlan driver
Published: August 28, 2026
Security Bulletin ID
SB2026082892
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-80681)
CWE-ID: CWE-416 - Use After Free
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 use-after-free in vxlan_xmit() in drivers/net/vxlan/vxlan_core.c when processing packets through route_shortcircuit(). A local user can trigger skb head reallocation and subsequent dereference of a stale ethernet header pointer to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff
- https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5
- https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585
- https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5
- https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555
- https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56
- https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4
- https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a