CVE-2026-64045
Linux kernel ovpn tcp_close race leads to use-after-free in ovpn subsystem
Is CVE-2026-64045 being exploited?
Not confirmed. CVE-2026-64045 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.15% probability of exploitation in the next 30 days.
How severe is CVE-2026-64045?
CVE-2026-64045 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-64045?
Yes. A fix has been recorded for CVE-2026-64045. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64045 affect?
CVE-2026-64045 affects Linux kernel (ovpn subsystem / OpenVPN kernel module), Kernels built with CONFIG_OVPN / ovpn_socket support. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64045?
Apply vendor kernel updates or backport patch; disable ovpn kernel module until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Use-after-free in kernel ovpn tcp_close: attacker (local or a VPN peer) can trigger kernel crash (DoS) or potentially escalate privileges via memory corruption.
Patch when possible
- affected>= 11851cbd60ea1e5abbd97619d69845ead99303d6 and < e5460eb7238c19d651a9b22b2378b587033a4095
- affected>= 11851cbd60ea1e5abbd97619d69845ead99303d6 and < d3ef441907fca7c340979e577a3db3bb634bf166
- affected>= 11851cbd60ea1e5abbd97619d69845ead99303d6 and < 775d8d7ad02aa345e1588424a6a8b9ae49fb9012
- affected6.16
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.