Both products do the same thing on paper: apply kernel security patches to a running Linux server without a reboot. The differences are entirely about which kernels they support, how patches reach air-gapped boxes, and what you pay per server. For a hosting fleet that runs anything other than pure Oracle Linux, the answer is almost always KernelCare. For a homogeneous Oracle Linux estate already on a Premier support contract, Ksplice is effectively free — and that matters.
This compares the two on the dimensions that actually decide procurement.
At a glance
| Dimension | KernelCare (TuxCare) | Ksplice (Oracle) |
|---|---|---|
| Distro coverage | RHEL, AlmaLinux, Rocky, CentOS 6/7/8, Ubuntu 16.04-24.04, Debian 10-12, CloudLinux, Amazon Linux, Oracle Linux | Oracle Linux (RHCK + UEK), RHEL 6/7/8 with caveats |
| Patch scope | Kernel CVEs + libcare userspace patches (glibc, OpenSSL) | Kernel CVEs only |
| On-prem distribution | ePortal (free with subscription) | Offline mode via uptrack-upload |
| Patch latency | Typically 24-72 hours from CVE disclosure | Typically 24-72 hours, sometimes faster on Oracle UEK |
| Reboot needed for major version jumps? | Yes, eventually | Yes, eventually |
| Pricing model | Per-server annual subscription, volume tiers | Bundled into Oracle Linux Premier Support |
| Standalone availability | Yes — buy direct | No — only via Oracle Linux Premier |
| cPanel / CloudLinux integration | First-class, automatic patchsets | None |
| Userspace patching | libcare for glibc, OpenSSL, OpenSSH | Limited, separate Ksplice Uptrack for userspace on Oracle Linux |
Distro coverage is the deciding factor
Ksplice ships first-class for Oracle Linux running either the Red Hat Compatible Kernel (RHCK) or the Unbreakable Enterprise Kernel (UEK). Oracle technically supports Ksplice on RHEL 6/7/8 too, but the install requires an Oracle account, a separate uptrack client, and a support contract that most non-Oracle shops won't have. There is no Ksplice for AlmaLinux, Rocky, Ubuntu, Debian, or CloudLinux — full stop.
KernelCare's matrix is the opposite: nearly every enterprise distro a hosting business is likely to run, with CloudLinux as a particularly tight integration since both products come from TuxCare. If your fleet is mixed — and most are, especially once you factor in customer-supplied VMs — Ksplice is a non-starter for the non-Oracle portion.
On-prem distribution
Both products can patch air-gapped servers, but the workflows differ.
KernelCare's ePortal is a free Django app you run on your own VM. Agents register against it, pull patches from it, and never touch TuxCare directly. Feeds support staging — test ring with a 72-hour delay before prod sees a patch. The full setup is in install KernelCare ePortal air-gapped.
Ksplice's offline mode is the equivalent for Oracle Linux. You download patches to an internet-connected host, transfer via uptrack-upload, and serve them from a local repo. It works, but it's CLI-heavy, lacks a real UI for feed promotion, and assumes you've got the Oracle support tooling already installed.
For ops teams who want a dashboard, scheduled feed promotion, and an API, KernelCare's ePortal is the more polished tool. For Oracle Linux shops who already have ULN configured, Ksplice's offline mode integrates into the existing flow with no extra infrastructure.
Patch scope and userspace coverage
Kernel patches are table stakes — both products land them in roughly the same window after CVE disclosure. Where KernelCare pulls ahead is libcare, which live-patches userspace libraries like glibc, OpenSSL, and OpenSSH without restarting the dependent services. That matters for Heartbleed-class CVEs where every long-running daemon would otherwise need a restart.
Ksplice has a userspace counterpart (Ksplice Uptrack for userspace) but coverage is narrower and Oracle Linux only.
If your audit framework counts userspace CVEs the same as kernel CVEs — and PCI DSS 4.0 does — KernelCare's libcare is the more defensible position.
Pricing model
KernelCare is sold per server per year, with volume tiers. The headline price drops sharply above ~50 servers; talk to our team about volume if your fleet is in that range. Licensing is portable between servers — decommission a box, free the seat.
Ksplice is bundled into Oracle Linux Premier Support, which is priced per-socket per-year on a sliding scale. If you're already paying for Oracle Linux Premier for other reasons (database support, indemnification), Ksplice is effectively free. If you're not, the Premier subscription is far more expensive than a standalone KernelCare seat — you'd be paying for support you don't need just to get live patching.
Worked example for a 100-server fleet, all 2-socket boxes, all Oracle Linux:
- KernelCare: 100 × per-server tier price (4-5 figures total per year, depending on tier).
- Oracle Linux Premier: 200 sockets × Premier per-socket price (well into 5-6 figures per year, but includes full Linux support).
If you already have Premier, take Ksplice. If you don't, KernelCare wins on cost alone.
When Ksplice is the right answer
- 100% Oracle Linux fleet.
- Existing Oracle Linux Premier subscription.
- Heavy use of UEK-specific features.
- Internal policy mandating single-vendor for OS + patching.
Ksplice has been in production since 2009 — Oracle bought it in 2011 — and is rock solid on the kernels it covers. Don't read this as a knock on the technology. It is a knock on the procurement model for anyone whose fleet isn't already deep in Oracle.
When KernelCare is the right answer
- Mixed distro fleet (anything other than pure Oracle Linux).
- CloudLinux on shared hosting (KernelCare integrates natively, including the cPanel workflow covered in KernelCare on cPanel).
- Need for on-prem patch distribution with a real dashboard.
- Want userspace CVE coverage for
glibc,OpenSSL,OpenSSH. - Buying standalone without a parent OS support contract.
Most hosting businesses fit the second list, which is why TuxCare dominates that segment. Pricing details and tier breaks live on the KernelCare license page and the full pricing matrix.
Migration notes
Moving from Ksplice to KernelCare on a server is uneventful: uninstall the uptrack agent, install kernelcare, register against your ePortal or TuxCare directly, and the next kcarectl --update loads the current patchset on top of the running kernel. No reboot, no kernel swap. The reverse direction works too, with the caveat that Ksplice will refuse to patch a kernel that already has KernelCare patches loaded — reboot to the clean on-disk kernel first.
Next steps
- Plan an on-prem deployment with install KernelCare ePortal air-gapped.
- See the cPanel-specific workflow at KernelCare on cPanel.
- Buy direct: KernelCare license or compare tiers on the pricing page.