I have installed them by installed linux-generic, and today i install the latest official 5.4.0-91 kernel, but it is even worse now.

mount command:
mount -t cifs //192.168.58.13/share /mnt/share/ -o username=guest,password=,noperm,noacl,file_mode=0644,iocharset=utf8,vers=2.1

Server is a windows server 2019 without any changes during the issues.

In 5.4.0-91, it seems that cifs is not loaded automatically, and after i modprobe cifs, it still fails with "mount error(13): Permission denied" with dmesg
[  189.086484] CIFS: Attempting to mount //192.168.58.13/share
[  189.090361] CIFS VFS: could not allocate crypto cmac(aes)
[  189.093222] CIFS VFS: could not allocate crypto cmac(aes)
[  189.099002] CIFS VFS: could not allocate crypto md4
[  189.099789] Status code returned 0xc000006d STATUS_LOGON_FAILURE
[  189.099796] CIFS VFS: \\192.168.58.13 Send error in SessSetup = -13
[  189.099923] CIFS VFS: cifs_mount failed w/return code = -13

If i rollback to 5.4.0-89, everything works fine.

> dpkg -l |fgrep -- -89
ii  linux-headers-5.4.0-89               5.4.0-89.100                          all          Header files related to Linux kernel version 5.4.0
ii  linux-headers-5.4.0-89-generic       5.4.0-89.100                          amd64        Linux kernel headers for version 5.4.0 on 64 bit x86 SMP
ii  linux-image-5.4.0-89-generic         5.4.0-89.100                          amd64        Signed kernel image generic
ii  linux-modules-5.4.0-89-generic       5.4.0-89.100                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii  linux-modules-extra-5.4.0-89-generic 5.4.0-89.100                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii  linux-tools-5.4.0-89                 5.4.0-89.100                          amd64        Linux kernel version specific tools for version 5.4.0-89
ii  linux-tools-5.4.0-89-generic         5.4.0-89.100                          amd64        Linux kernel version specific tools for version 5.4.0-89

> dpkg -l |fgrep -- -91
ii  linux-headers-5.4.0-91               5.4.0-91.102                          all          Header files related to Linux kernel version 5.4.0
ii  linux-headers-5.4.0-91-generic       5.4.0-91.102                          amd64        Linux kernel headers for version 5.4.0 on 64 bit x86 SMP
ii  linux-image-5.4.0-91-generic         5.4.0-91.102                          amd64        Signed kernel image generic
ii  linux-modules-5.4.0-91-generic       5.4.0-91.102                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii  linux-modules-extra-5.4.0-91-generic 5.4.0-91.102                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii  linux-tools-5.4.0-91                 5.4.0-91.102                          amd64        Linux kernel version specific tools for version 5.4.0-91
ii  linux-tools-5.4.0-91-generic         5.4.0-91.102                          amd64        Linux kernel version specific tools for version 5.4.0-91
ii  linux-tools-common                   5.4.0-91.102                          all          Linux kernel version specific tools for version 5.4.0

> uname -r
5.4.0-91-generic