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  1. Scott Mutter
  2. Thursday, February 11, 2016
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2.6.32-573.18.1.el6.x86_64 Unknown?
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  1. 11.02.2016 12:02:44
  2. # 1
Scott Mutter Accepted Answer
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I get the following error when running kcarectl:

# kcarectl --check
Unknown Kernel (CentOS 2.6.32-573.18.1.el6.x86_64)

# kcarectl --version
2.5-2
  1. 23.02.2016 06:02:22
  2. # 2
Chris Danks Accepted Answer
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HI
you can only use kernel care with cloudlinux and not centos
  1. 23.02.2016 08:02:30
  2. # 3
Igor Seletskiy Accepted Answer
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KernelCare works with CentOS kernel as well as bunch of others, like Ubuntu, Debian, RHEL, Virtuozzo, Proxmox.
This particular kernel was recognized on Feb 14th.
  1. 30.05.2016 10:05:20
  2. # 4
Scott Mutter Accepted Answer
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Noticing this now with CentOS kernel 2.6.32-642.el6, which is weird because the kernelcare kernel is using this version

# uname -r
2.6.32-642.el6.x86_64
# kcarectl --check
Unknown Kernel (CentOS 2.6.32-642.el6.x86_64)
# kcare-uname -r
2.6.32-642.el6.x86_64

Also getting an unknown kernel for the latest OpenVZ RHEL6 kernel - 042stab116.1.

# uname -r
2.6.32-042stab116.1
# kcarectl --check
Unknown Kernel (CentOS 2.6.32-042stab116.1)
# kcare-uname -r
2.6.32-042stab116.1
  1. 02.10.2017 14:10:07
  2. # 5
Scott Neader Accepted Answer
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Did you ever get a resolution on this? We are seeing the same thing today, for kernel CentOS 2.6.32-696.10.3.el6.x86_64

- Scott
  1. 08.10.2017 04:10:49
  2. # 6
Derek Knight Accepted Answer
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I have just purchased kernel care via cpanel and it appears to have installed correctly. however I get this message when trying to install extra patches as shown in this post https://www.cloudlinux.com/imunify360-imunifysensor-blog/entry/the-kernelcare-extra-patchset-with-symlink-protection-is-now-available

root [/]# kcarectl --set-patch-type extra --update
Unknown Kernel (CentOS 2.6.32-696.13.2.el6.x86_64)
root [/]# _


Why am I paying for something that doesn't work.
  1. 18.10.2017 17:10:12
  2. # 7
Irina Semenova Accepted Answer
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This kernel should work. Could you check again, please? Or you can create support ticket and we will fix your problem shortly!
  1. 27.10.2017 22:10:37
  2. # 8
Jay Accepted Answer
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After the cPanel 66.0.29 update installed last night, I began seeing the Security Advisor warning that I had no symlink race condition protection, and began investigating because I had successfully installed the "Extra" patchset for version 66.0.26. I'm getting the same error about the "Unknown kernel" as Derek. When I try to run the command:

kcarectl --patch-info

I get:

Unknown kernel (CentOS 2.6.32-696.13.2.el6.x86_64), no patches available

I'm not sure, but I think the problem may be that Kernelcare is misidentifying the kernel. Take a look at what uname and kcare-uname output:

[[email protected] ~]# uname -r
2.6.32-696.13.2.el6.x86_64

[[email protected] ~]# kcare-uname -r
2.6.32-696.13.2.el6.x86_64.x86_64

Kcare-uname has an extra ".x86_64" tacked on the end of the kernel name. That can't be good.

Is there any fix for this yet?
  1. 27.10.2017 22:10:03
  2. # 9
Igor Seletskiy Accepted Answer
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This kcare-uname -r issue is something we are aware of -- and will be fixing soon (2-4 weeks).

The issue with security advisor is that it doesn't know about extra/free patches and that it fixes symlink issue. cPanel team is aware of it, and is working on it as well. We got very early / approximate ETA of 2-3 months from now for the fix in security advisor.
  1. 27.10.2017 22:10:46
  2. # 10
Jay Accepted Answer
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Thanks for the info, Igor, but I am confused. The main issue for now is getting the "Extra" patch installed when the kernel is unrecognized. Are you saying it will be 2-4 weeks before we can expect a way to do so?
  1. 28.10.2017 01:10:54
  2. # 11
Igor Seletskiy Accepted Answer
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No, the new kernel will be supported in a few days. Overall, it is not worth it to update to a new kernel if you have KC. All critical security vulnerabilities are fixed in advance, so you do a reboot for nothing.
  1. 07.01.2018 08:01:19
  2. # 12
sohail Accepted Answer
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I am also getting the following message

/usr/bin/kcarectl --update
Unknown Kernel (CloudLinux 3.10.0-714.10.2.lve1.5.3.el7.x86_64)
  1. 07.01.2018 08:01:58
  2. # 13
Derek Knight Accepted Answer
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Now getting Unknown Kernel (CentOS 2.6.32-696.18.7.el6.x86_64)
/usr/bin/kcarectl --auto-update --gradual-rollout=auto

why is cloudlinux so slow on updating kernel care to fix these new bugs
  1. 07.01.2018 17:01:19
  2. # 14
Igor Seletskiy Accepted Answer
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Why: Details are here: https://www.cloudlinux.com/cloudlinux-os-blog/entry/intel-cpu-bug-kernelcare-and-cloudlinux

We are the only vendor who is even trying to get the patch. Everyone else gave up even before they started due to how massive change is, and how hard it is to apply to the running kernel.
  1. 09.01.2018 10:01:12
  2. # 15
Marci Accepted Answer
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Also getting Unknown kernel for CentOS6.9 latest... on the free patch type (for symlink protection).

# kcarectl --set-patch-type free --update
Unknown Kernel (CentOS 2.6.32-696.18.7.el6.x86_64)

# kcarectl --check
Unknown kernel (CentOS 2.6.32-696.18.7.el6.x86_64), no patches available

# kcarectl --version
2.14-2

# uname -r
2.6.32-696.18.7.el6.x86_64

# kcare-uname -r
2.6.32-696.18.7.el6.x86_64.x86_64

(Following guidance at https://documentation.cpanel.net/display/EA4/Symlink+Race+Condition+Protection for rolling back from their now-discontinued hardened kernel and https://www.cloudlinux.com/kernelcare-blog/entry/symlink-protection-patchset-centos-6-7-kernelcare?start=20)
  1. 09.01.2018 16:01:46
  2. # 16
Posts: 145
Joined: 31.01.2017
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New kernels are usually added to the list of supported by KernelCare within a few days. This error will disappear since then, so no additional actions are required from customer's side.
  1. 10.01.2018 08:01:53
  2. # 17
Marci Accepted Answer
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Excellent - thanks Alexandre...
  1. 27.01.2018 05:01:26
  2. # 18
Derek Knight Accepted Answer
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Any ideas when kernelcare will update to
root [/]# /usr/bin/kcarectl --update
Unknown Kernel (CentOS 2.6.32-696.20.1.el6.x86_64)
root [/]# _
  1. 28.01.2018 10:01:06
  2. # 19
Derek Knight Accepted Answer
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It is not on the list of supported kernels, unless you are very slow in updating the lists
We get this every time there is a kernel update & kernelcare is 3 or 4 days or even 1 week late in adding it after Cpanel does an auto-update & forces you to reboot
Unknown Kernel (CentOS 2.6.32-696.20.1.el6.x86_64)
http://patches.kernelcare.com/
Shows most recent version as
kernel-2.6.32-696.18.7.el6(Last Updated: 2018-01-10 13:37:30)
  1. 30.01.2018 08:01:23
  2. # 20
Posts: 145
Joined: 31.01.2017
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Derek, sorry to misinform you.
This kernel is not in the list of supported as it has no known security vulnerabilities, and this is why we haven't built a stub for it yet.
You can safely ignore these warning messages ("Unknown Kernel" ). Or you can add in to your /etc/sysconfig/kcare/kcare.conf the following setting to ignore these messages:
IGNORE_UNKNOWN_KERNEL=True
More details here: http://docs.kernelcare.com/index.html?config_options.htm
Usually, we add KC support for the new kernels within 3-4 days.
You can always check if KernelCare supports your current kernel here:
http://patches.kernelcare.com/
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