How to figure out currently used kernel if uname does not tell the detailed version?

Question

There seems to be a lot of kernels installed:

root@v59530:/boot# dpkg -l | grep "linux-[a-z]*-"
ii  linux-aws-headers-4.15.0-1007                 4.15.0-1007.7                           all          Header files related to Linux kernel version 4.15.0
...
ii  linux-aws-headers-4.15.0-1032                 4.15.0-1032.34                          all          Header files related to Linux kernel version 4.15.0
ii  linux-aws-headers-4.15.0-1033                 4.15.0-1033.35                          all          Header files related to Linux kernel version 4.15.0
ii  linux-azure-headers-4.15.0-1009               4.15.0-1009.9                           all          Header files related to Linux kernel version 4.15.0
...
ii  linux-azure-headers-4.15.0-1032               4.15.0-1032.33                          all          Header files related to Linux kernel version 4.15.0
ii  linux-gcp-headers-4.15.0-1006                 4.15.0-1006.6                           amd64        Header files related to Linux kernel version 4.15.0
...
ii  linux-gcp-headers-4.15.0-1032                 4.15.0-1032.34                          amd64        Header files related to Linux kernel version 4.15.0
ii  linux-gcp-headers-4.15.0-1033                 4.15.0-1033.35                          amd64        Header files related to Linux kernel version 4.15.0
ii  linux-gke-4.15-headers-4.15.0-1030            4.15.0-1030.32                          amd64        Header files related to Linux kernel version 4.15.0
ii  linux-gke-4.15-headers-4.15.0-1032            4.15.0-1032.34                          amd64        Header files related to Linux kernel version 4.15.0
ii  linux-gke-4.15-headers-4.15.0-1033            4.15.0-1033.35                          amd64        Header files related to Linux kernel version 4.15.0
ii  linux-headers-4.15.0-1004-oem                 4.15.0-1004.5                           amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1005-dell300x            4.15.0-1005.8                           amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1006-dell300x            4.15.0-1006.10                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
...
ii  linux-headers-4.15.0-1030-kvm                 4.15.0-1030.30                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1030-oem                 4.15.0-1030.35                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1030-oracle              4.15.0-1030.33                          amd64        Oracle Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1031-aws                 4.15.0-1031.33                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1031-azure               4.15.0-1031.32                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1031-kvm                 4.15.0-1031.31                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1031-oracle              4.15.0-1031.34                          amd64        Oracle Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1032-aws                 4.15.0-1032.34                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1032-azure               4.15.0-1032.33                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1032-gcp                 4.15.0-1032.34                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1032-gke                 4.15.0-1032.34                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1032-kvm                 4.15.0-1032.32                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1033-aws                 4.15.0-1033.35                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1033-gcp                 4.15.0-1033.35                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1033-gke                 4.15.0-1033.35                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-headers-4.15.0-1033-oem                 4.15.0-1033.38                          amd64        Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii  linux-kvm-headers-4.15.0-1008                 4.15.0-1008.8                           all          Header files related to Linux kernel version 4.15.0
...
ii  linux-kvm-headers-4.15.0-1031                 4.15.0-1031.31                          all          Header files related to Linux kernel version 4.15.0
ii  linux-kvm-headers-4.15.0-1032                 4.15.0-1032.32                          all          Header files related to Linux kernel version 4.15.0
ii  linux-libc-dev:amd64                          4.15.0-135.139                          amd64        Linux Kernel Headers for development
ii  linux-oem-headers-4.15.0-1004                 4.15.0-1004.5                           all          Header files related to Linux kernel version 4.15.0
...
ii  linux-oem-headers-4.15.0-1033                 4.15.0-1033.38                          all          Header files related to Linux kernel version 4.15.0
ii  linux-oracle-headers-4.15.0-1007              4.15.0-1007.9                           all          Header files related to Oracle Linux kernel version 4.15.0
ii  linux-oracle-headers-4.15.0-1008              4.15.0-1008.10                          all          Header files related to Oracle Linux kernel version 4.15.0
...
ii  linux-oracle-headers-4.15.0-1033              4.15.0-1033.36                          all          Header files related to Oracle Linux kernel version 4.15.0

I could not get informed about the current used one:

picture: trying to get kernel info using uname

root@v59530:/boot# uname -r
4.15.0
root@v59530:/boot# uname -v # ???
#1 SMP Thu Apr 22 16:18:59 MSK 2021
root@v59530:/boot# uname -m
x86_64
root@v59530:/boot# uname -a
Linux v59530.1blu.de 4.15.0 #1 SMP Thu Apr 22 16:18:59 MSK 2021 x86_64 x86_64 x86_64 GNU/Linux
root@v59530:/boot# cat /proc/version
Linux version 4.15.0 (mockbuild@builder7.eng.sw.ru) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) ) #1 SMP Thu Apr 22 16:18:59 MSK 2021
root@v59530:/boot# hostnamectl | grep Kernel
            Kernel: Linux 4.15.0
root@v59530:/boot# cd /etc/default/grub
-bash: cd: /etc/default/grub: No such file or directory
root@v59530:/boot# uname -mrs
Linux 4.15.0 x86_64
root@v59530:/boot# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.5 LTS"
root@v59530:/boot# cat /etc/issue
Ubuntu 18.04.5 LTS \n \l

Links that I used during my research:

• How to I prevent Ubuntu from kernel version upgrade and notification?
• Ubuntu won't boot - kernel error?
• https://unix.stackexchange.com/questions/199214/debian-how-to-get-the-current-loaded-kernel-package-name
• https://stackabuse.com/substrings-in-bash
• https://www.cyberciti.biz/faq/find-print-linux-unix-kernel-version/
• uname -r returns the wrong kernel version

Expected behavior according to cyberciti.biz:

    So my Linux kernel version is 4.15.0-39, where:
4 : Kernel version     

15 : Major revision 
    0 : Minor revision

   39 : Patch level or number

 generic : Linux distro/kernel specific additional info