CVE-2026-89565
kernel: ipip: fix skb leak in collect_md mode when metadata_dst allocation fails
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 11, 2026
Updated · September 29, 2026
Description
A flaw was found in the Linux kernel's IP over IP (ipip) tunnel driver. When operating in collect_md mode, the ipip_tunnel_rcv() function fails to free a network packet buffer (skb) if the metadata_dst allocation fails. This oversight leads to a memory leak. A local attacker could potentially exploit this vulnerability to exhaust system memory, resulting in a Denial of Service (DoS).
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-772 · Missing Release of Resource after Effective Lifetime