CVE-2026-64044

A flaw was found in the Linux kernel's OpenVPN ovpn module. An error in the ovpnnlpeernewdoit function's error handling for TCP connections can lead to a use-after-free vulnerability. This occurs because the peer's memory is prematurely released while userspace processes may still hold active...

CVE-2026-64043

A flaw was found in the Linux kernel's ovpn module. A race condition can occur when an ovpn interface is being deleted while a new peer is simultaneously added via netlink. This timing issue may cause the network device to become unresponsive, preventing its proper removal and leading to a denial...

CVE-2026-64045

A flaw was found in the Linux kernel's OpenVPN ovpn TCP module. A race condition in the ovpntcpclose function allows it to access memory after it has been freed. This vulnerability arises when the function attempts to use a socket peer pointer after its associated socket object has been...

Important: openvpn

Issue Overview: An attacker controlling an HTTP proxy or performing MITM on the plaintext pre-TLS proxy connection can trigger a single 0-byte overrun to a buffer on the stack by sending a crafted NTLM Type 2 challenge response. CVE-2026-11771 If the active TLS session has a pending dedicated ACK...

Amazon Linux 2023 : openvpn, openvpn-devel (ALAS2023-2026-1990)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1990 advisory. An attacker controlling an HTTP proxy or performing MITM on the plaintext pre-TLS proxy connection can trigger a single 0-byte overrun to a buffer on the stack by sending a crafted NTLM Type 2...

Linux Distros Unpatched Vulnerability : CVE-2026-64044

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In the Linux kernel, the following vulnerability has been resolved: ovpn: respect peer refcount in CMDNEWPEER error path ovpnnlpeernewdoit's error path calls...

Linux Distros Unpatched Vulnerability : CVE-2026-64045

"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In the Linux kernel, the following vulnerability has been resolved: ovpn: tcp - use cached peer pointer in ovpntcpclose ovpntcpclose loads the ovpnsocket via...

CVE-2026-64045 ovpn: tcp - use cached peer pointer in ovpn_tcp_close()

In the Linux kernel, the following vulnerability has been resolved: ovpn: tcp - use cached peer pointer in ovpntcpclose ovpntcpclose loads the ovpnsocket via rcudereferenceskuserdata under rcureadlock, takes a reference on sock-peer, caches the peer pointer in a local, and drops the read lock. It...

CVE-2026-64044

In the Linux kernel, the following vulnerability has been resolved: ovpn: respect peer refcount in CMDNEWPEER error path ovpnnlpeernewdoit's error path calls ovpnpeerrelease directly rather than ovpnpeerput, bypassing the kref. The accompanying comment "peer was not yet hashed, thus it is not use...

CVE-2026-64043

A race condition in the Linux kernel 's ovpn component allows a netdevice to hang during unregistration. This occurs when a CMD_PEER_NEW netlink message adds a new peer while the device is being deleted in ovpn_dellink(), as the kernel incorrectly assumes all peers were already released. The fix ...

CVE-2026-64044 ovpn: respect peer refcount in CMD_NEW_PEER error path

In the Linux kernel, the following vulnerability has been resolved: ovpn: respect peer refcount in CMDNEWPEER error path ovpnnlpeernewdoit's error path calls ovpnpeerrelease directly rather than ovpnpeerput, bypassing the kref. The accompanying comment "peer was not yet hashed, thus it is not use...

EUVD-2026-45617

In the Linux kernel, the following vulnerability has been resolved: ovpn: respect peer refcount in CMDNEWPEER error path ovpnnlpeernewdoit's error path calls ovpnpeerrelease directly rather than ovpnpeerput, bypassing the kref. The accompanying comment "peer was not yet hashed, thus it is not use...

CVE-2026-64043 ovpn: fix race between deleting interface and adding new peer

In the Linux kernel, the following vulnerability has been resolved: ovpn: fix race between deleting interface and adding new peer While deleting an existing ovpn interface, there is a very narrow window where adding a new peer via netlink may cause the netdevice to hang and prevent its...

OESA-2026-3001 openvpn security update

OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. Starting with the...

PT-2026-61360

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A race condition exists in the ovpn module during the deletion of an interface. A narrow window occurs during the ovpn dellink process where a CMD PEER NEW message sent via netlink to ad...

The vulnerability of the exportOvpn function in the /web/cgi-bin/cstecgi.cgi component of the TOTOLINK X5000R router’s microprogramming system allows a perpetrator to gain unauthorized access to protected information.

The vulnerability of the exportOvpn function in the /web/cgi-bin/cstecgi.cgi component of the TOTOLINK X5000R router microprogramming system is related to an incorrect limitation on the path name to the restricted access directory. Exploiting this vulnerability could allow a malicious actor to ga...

Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenVPN vulnerabilities (USN-8540-1)

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8540-1 advisory. It was discovered that OpenVPN had a 1-byte buffer overrun when handling NTLMv2 proxy responses. An attacker could use this issue...

USN-8540-1 openvpn vulnerabilities

It was discovered that OpenVPN had a 1-byte buffer overrun when handling NTLMv2 proxy responses. An attacker could use this issue to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. CVE-2026-11771 It was discovered that...

USN-8540-1: OpenVPN vulnerabilities

It was discovered that OpenVPN had a 1-byte buffer overrun when handling NTLMv2 proxy responses. An attacker could use this issue to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. CVE-2026-11771 It was discovered that...

CVE-2026-15204

A vulnerability was detected in TOTOLINK X5000R 9.1.0cu.2415B20250515/9.1.0cu.2350B20230313. Affected by this vulnerability is the function exportOvpn of the file /web/cgi-bin/cstecgi.cgi of the component OpenVPN Export. The manipulation results in path traversal. The attack may be launched...