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Check the running kernel’s Spectre status through two read-only sysfs files. Spectre variant 1 and variant 2 have separate reports, so inspect both:
cat /sys/devices/system/cpu/vulnerabilities/spectre_v1
cat /sys/devices/system/cpu/vulnerabilities/spectre_v2To print both reports in one command, run cat /sys/devices/system/cpu/vulnerabilities/spectre_v1 /sys/devices/system/cpu/vulnerabilities/spectre_v2. The text describes the kernel’s assessment of the processor and the mitigations enabled for the running system. It is not a universal certification that every speculative-execution attack is impossible.
Run the Spectre check
Open a terminal on the Linux system you want to inspect. These commands only read files; they do not change kernel settings, unload drivers, or reboot the machine.
- Check variant 1 with
cat /sys/devices/system/cpu/vulnerabilities/spectre_v1 - Check variant 2 with
cat /sys/devices/system/cpu/vulnerabilities/spectre_v2 - For a combined result, use
cat /sys/devices/system/cpu/vulnerabilities/spectre_v1 /sys/devices/system/cpu/vulnerabilities/spectre_v2
The Linux kernel documents these two paths as the status interface for Spectre variants 1 and 2. Run the commands on the machine whose protection you are evaluating: a result from one host says nothing about another host with a different CPU, microcode, kernel build, or boot configuration.
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Why there are two status files
spectre_v1: variant 1
The first file reports the kernel’s assessment and protection state for Spectre variant 1. A result of Not affected means the kernel considers the processor not vulnerable to that variant. Other output can identify defenses such as user-pointer sanitization or usercopy and swapgs barriers.
Variant 1 protection is applied on a case-by-case basis. Linux kernel documentation explicitly warns: “However, the protections are put in place on a case by case basis, and there is no guarantee that all possible attack vectors for Spectre variant 1 are covered.” Therefore, a mitigation phrase means that the kernel enabled the defenses it knows how to apply for the supported interfaces; it does not promise coverage of every conceivable variant 1 technique.
spectre_v2: variant 2
The second file reports Spectre variant 2. Depending on the processor, microcode, kernel release, and boot options, the report can mention software retpoline mitigation, hardware mitigation, and process-specific protections. It may also mention IBPB and STIBP, which provide additional isolation between processes.
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Read both files. A system can be unaffected by one variant while requiring mitigation for the other, so treating one output as a generic Spectre result gives an incomplete picture.
How to interpret the output
Kernel status strings are not identical across releases. Do not compare a line copied from an older kernel with current output character for character and conclude that a changed wording represents a loss of protection. Interpret the meaning of the status category and the mitigation named in the line.
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| Report | Meaning | Important qualification |
|---|---|---|
Not affected for Spectre v1 |
The running kernel considers the processor not vulnerable to variant 1. | This is the kernel’s assessment for that variant, not a guarantee against unrelated speculative-execution issues. |
| A Spectre v1 mitigation description | The kernel has enabled one or more applicable defenses, such as user-pointer sanitization or usercopy and swapgs barriers. | Linux applies variant 1 protections case by case and says all possible attack vectors are not guaranteed to be covered. |
Not affected for Spectre v2 |
The running kernel considers the processor not vulnerable to variant 2. | The result is specific to the processor and the active kernel configuration. |
Mitigation: None for Spectre v2 |
The processor is considered vulnerable and no Spectre v2 mitigation is active. | Treat this as an unmitigated state that needs investigation rather than as a harmless informational line. |
| A software retpoline or hardware mitigation for Spectre v2 | The kernel identifies the mitigation approach currently in use. | The exact wording and combination depend on kernel version, CPU features, microcode, and boot configuration. |
| IBPB or STIBP in a Spectre v2 report | The report identifies additional process-isolation features that may be enabled. | These controls can affect performance, so their presence is useful operational information, not merely a pass-or-fail label. |
When the line says Not affected
This is the clearest result for the named variant: the kernel does not consider the processor vulnerable to it. It does not mean the system has no security updates to install, nor does it cover the other Spectre variant. Always inspect both files and keep the kernel and processor microcode maintained according to your Linux distribution’s normal update process.
When the line names a mitigation
A mitigation line means the kernel detected a relevant exposure and enabled a defense supported by that CPU and kernel configuration. For variant 2, the line can distinguish software retpoline from a hardware mitigation and can identify process-specific controls. The presence of a mitigation is materially different from Not affected: the processor may be susceptible, but the kernel has activated a countermeasure.
When the line says Mitigation: None
For Spectre v2, Linux documentation defines this state as vulnerable without mitigation. Record the complete line, then investigate the running kernel, CPU microcode, distribution updates, and boot command line with the system administrator. Do not assume that installing an arbitrary package or changing a boot option is a safe universal fix; the appropriate remedy depends on the platform.
Why two identical computers can report different states
The status is calculated for the running environment, not for a model name alone. Several inputs can change what appears in the files:
- Kernel release and build: status formats and available mitigations evolve, and a distribution may backport security changes into its own kernel build.
- Processor features: different CPU generations expose different hardware capabilities and vulnerability profiles.
- Microcode: processor firmware supplied through the platform or operating-system update path can change which hardware protections the kernel can use.
- Kernel configuration: a distribution’s build choices determine which mitigation mechanisms are available.
- Boot parameters: administrators can override normal defaults or disable selected mitigations on the kernel command line.
For this reason, copy the output from the live system and keep the surrounding context. A result from a rescue environment, an older boot entry, or a virtual machine may not describe the production kernel you intended to check.
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Check whether boot options changed the defaults
Linux normally chooses mitigation defaults based on the current CPU. The kernel documentation also defines command-line controls that can alter those choices. Display the command line used for the current boot with:
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cat /proc/cmdlineLook for parameters relevant to Spectre. The documented examples include:
| Parameter | What it controls |
|---|---|
nospectre_v1 |
Disables Spectre v1 mitigations. |
nospectre_v2 |
Disables Spectre v2 mitigations. |
spectre_v2={option} |
Selects a Spectre v2 mitigation mode supported by the kernel. |
spectre_v2_user={option} |
Selects the user-space Spectre v2 mitigation mode. |
spectre_bhi={option} |
Controls the kernel’s handling of the documented Spectre-related branch-history injection option. |
The brace notation indicates a value chosen from options supported by that kernel; do not paste the braces literally unless your kernel documentation says to do so. A command-line parameter can explain why a status differs from a distribution’s normal default. Conversely, removing or adding one changes the security/performance trade-off for future boots and should be treated as an administrative change, not as a casual troubleshooting step.
If the status files are missing
An error such as “No such file or directory” means the documented sysfs status interface is not available at that path in the environment where you ran the command. The absence of the files does not establish that the processor is safe or vulnerable.
Confirm that you are checking the intended system
Run the commands locally on the host, not in a container or restricted recovery shell that may expose a different view of /sys. Confirm the path exactly: /sys/devices/system/cpu/vulnerabilities/spectre_v1 and /sys/devices/system/cpu/vulnerabilities/spectre_v2. The names are case-sensitive.
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Collect the platform details
Before choosing a platform-specific remedy, record the distribution, kernel release, and CPU details. These commands provide that context:
cat /etc/os-release
uname -r
lscpuAlso record the active boot command line with cat /proc/cmdline. Include the exact error text and whether one file or both are absent. Linux’s official documentation does not provide one universal command that repairs every missing-file case; the correct next step depends on the distribution, kernel build, CPU, and execution environment.
Do not infer protection from another machine
A neighboring server, a host operating system, or a different kernel package may expose the files and show a reassuring line while the affected machine does not. Use the details from the machine under review when consulting your distribution’s support documentation or administrator.
A practical workflow for administrators
- Capture both status files. Save the output of the two
catcommands without editing the text. - Label each line. Note which line came from
spectre_v1and which came fromspectre_v2; a combined output can otherwise be misread. - Record system context. Save
uname -r, the distribution information from/etc/os-release, CPU information fromlscpu, and/proc/cmdline. - Classify the result. Mark each variant as not affected, mitigated, or vulnerable without mitigation according to the wording actually displayed.
- Investigate exceptions. If a mitigation is absent, if the line says
Mitigation: None, or if the files are missing, compare the context with the distribution’s security guidance before changing packages or boot settings. - Recheck after changes. Kernel, microcode, boot-loader, or command-line changes can alter the reported state. Run both status commands again on the newly booted system.
What the check can and cannot prove
The files report the running kernel’s view of processor exposure and the mitigations enabled through its supported vulnerability interface. They do not constitute a complete hardware security audit, a promise that every speculative-execution attack is blocked, or evidence that all software has been patched for every related issue.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesThis limitation is especially important for variant 1. Linux applies protections case by case and explicitly makes no guarantee that every possible variant 1 attack vector is covered. For variant 2, a mitigation report identifies the approach in use, but the exact protection still depends on CPU features, microcode, kernel code, and boot configuration.
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IBPB and STIBP can strengthen process isolation in circumstances supported by the kernel. Their use may carry a performance cost, so the status output can help explain a workload change after a kernel or firmware update. The documentation consulted for this procedure does not establish one universal percentage cost; measure a particular workload in its own environment rather than applying a generic number.
What to do for each outcome
Both variants say Not affected
Keep the output as an audit record and continue normal distribution, kernel, and microcode maintenance. The two lines answer the two named Spectre checks; they do not replace broader security updates.
One or both variants show a mitigation
Leave the mitigation enabled unless a qualified administrator has a documented reason to change it. Record whether the line names retpoline, hardware mitigation, IBPB, STIBP, or another mechanism, because that detail explains the protection mode and can matter when diagnosing performance or compatibility.
Spectre v2 says Mitigation: None
Treat the processor as vulnerable without an active mitigation. Escalate with the kernel release, distribution, CPU, microcode information available to your platform team, and the active command line. Do not disable additional protections to make the output look different; a changed label is not the same as improved security.
The files are absent
Do not label the host safe. Gather the distribution, kernel release, CPU details, command line, environment, and exact error, then use platform-specific support guidance. There is no single repair command that is valid for every missing-interface case.
Quick Recap
Common mistakes to avoid
- Checking only variant 1 or only variant 2: the files cover different variants and must be read separately.
- Equating a mitigation with immunity: a mitigation reports an enabled defense, not coverage of every possible attack.
- Copying an old status string as a universal standard: wording changes with kernel releases and available CPU features.
- Ignoring boot configuration:
nospectre_v1,nospectre_v2, and the other documented controls can change the active state. - Assuming missing files mean no vulnerability: unavailable status files provide no safety verdict.
- Disabling mitigations as a first fix: command-line changes can reduce protection and should be deliberate, documented administrative decisions.
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