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What live patching changes—and what it does not
Linux livepatching redirects selected calls from vulnerable kernel functions to replacement implementations while the system remains running. The kernel’s consistency model transitions tasks to the patched state at safe points rather than switching them mid-operation. The upstream Linux livepatch documentation describes this mechanism and its limits.
It is not a full kernel upgrade. Some functions cannot be safely patched at runtime, and implementation constraints—including tracing, probes, or architecture support—can affect whether a live patch is available. Upstream documentation describes the mechanism; it does not guarantee that a distributor has issued a patch for a particular CVE.
What a rebooted kernel update changes
Installing a newer kernel package does not replace the kernel currently in memory. The machine continues running its existing kernel until it reboots, at which point it starts with the updated one. Canonical says its Livepatch service covers only a subset of fixes in kernel stable release updates (SRUs); a conventional kernel upgrade and reboot are necessary when a code path cannot be safely livepatched.
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Rebooting also matters for some updates beyond the kernel. Canonical lists CPU firmware or microcode, shared libraries such as glibc, and BIOS/EFI updates among possible reboot triggers. Check the package’s and vendor’s instructions rather than assuming a kernel live patch handles those components.
Which approach is safer for a particular vulnerability?
Decide based on the specific CVE, distribution, supported kernel, and operational impact—not on a blanket preference for “no reboot.” A live patch can be a useful immediate mitigation when it is available for the running system and delaying remediation would leave meaningful exposure or cause avoidable service disruption. Reboot into the updated kernel when the vendor requires it, the fix needs a newer kernel, or runtime patching is not supported for that fix.
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| Question | Live patch | Kernel update and reboot |
|---|---|---|
| Does it address this vulnerability? | Only if the vendor supports a live patch for that CVE and the running kernel. | Only if the installed update contains the fix; the running system uses it after reboot. |
| When does the running system use the fix? | After the applicable patch is applied and its transition completes. | After rebooting into the updated kernel. |
| Does it replace the whole kernel? | No. It replaces selected function implementations. | Yes. The machine starts the installed newer kernel. |
| Does it avoid a service interruption? | It can avoid an unscheduled reboot for a covered fix; patch availability and completion still need checking. | A reboot interrupts services unless the system’s architecture and operations mitigate that impact. |
| Does it cover non-kernel updates? | No. Separate component updates may have their own reboot requirements. | A reboot can activate updates that require initialization at boot, but follow each vendor’s instructions. |
How vendor coverage differs
Ubuntu
Canonical says Ubuntu Livepatch addresses high and critical kernel vulnerabilities and covers a subset of fixes in kernel SRUs. Its staged testing and release process does not mean every kernel fix receives a live patch. Canonical also states that enabling Livepatch does not enable APT security updates: keep installing security packages separately. See Canonical’s Livepatch documentation and its guidance on when to reboot.
Canonical’s “When to reboot” guidance, last updated June 18, 2026, puts the key limitation plainly: “Live kernel patching is not sufficient when you need to upgrade your kernel to a newer version — a reboot is required in that case.”
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Red Hat Enterprise Linux
Red Hat describes applying selected critical and important security patches to a running RHEL kernel without rebooting. That is vendor- and release-specific: check the current Red Hat documentation for the RHEL release, kernel, support lifecycle, and feature availability in your environment.
Other distributions
Do not assume Ubuntu or RHEL coverage applies to another distribution. Eligibility can vary by release, kernel, architecture, and vulnerability. Consult that distribution’s current support matrix and security notice.
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A practical update decision
- Identify the exact system and fix. Check the distribution, release, running kernel, and vendor security notice for the CVE.
- Verify live-patch eligibility. Confirm that the vendor supports the running kernel and architecture and has a patch for the vulnerability. Do not infer coverage from having enabled a live-patching service.
- Apply available security updates. Livepatch does not replace normal package updates. Install the vendor’s security packages and any applicable live patch.
- Confirm the patch completed. Upstream livepatch transitions tasks individually; a transition can remain in progress if tasks are stuck. Check vendor status tools and instructions rather than treating an enabled service or requested patch as proof of completion.
- Schedule the required reboot. Reboot into the updated kernel when the vendor directs it, livepatch cannot cover the fix, or another update requires a reboot. If a live patch is serving as an interim mitigation, retain a maintenance plan for the kernel update.
Bottom line for administrators
Use a supported live patch to reduce the wait for a covered kernel fix when downtime is costly, but treat it as targeted remediation—not a substitute for security updates or every kernel upgrade. Reboot into the updated kernel whenever the fix or vendor guidance requires it, and verify that any live-patch transition has actually completed.
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