Today I decided to follow the steps to patch my server from the dirty c0w vulnerability.

It's running Ubuntu 12.04 LTS:

uname -rv

3.2.0-87-generic #125-Ubuntu SMP Fri Jun 19 08:25:10 UTC 2015

uname -a

Linux webdev 3.2.0-87-generic #125-Ubuntu SMP Fri Jun 19 08:25:10 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

So, as every version prior to 3.2.0-113.155 are affected, I've ran the following command:

sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade

Everything went fine, I rebooted:

sudo reboot

But now that I check my version, it has not changed:

uname -rv

3.2.0-87-generic #125-Ubuntu SMP Fri Jun 19 08:25:10 UTC 2015

Did I miss something ? I double checked and I didn't get any error during during the upgrade.

Edit based on comments / answers

I ran sudo update-grub and got the following:

Generating grub.cfg ...

Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.

Found linux image: /boot/vmlinuz-3.2.0-87-generic

Found initrd image: /boot/initrd.img-3.2.0-87-generic

Found linux image: /boot/vmlinuz-3.2.0-86-generic

Found initrd image: /boot/initrd.img-3.2.0-86-generic

Found linux image: /boot/vmlinuz-3.2.0-85-generic

Found initrd image: /boot/initrd.img-3.2.0-85-generic

Found linux image: /boot/vmlinuz-3.2.0-84-generic

Found initrd image: /boot/initrd.img-3.2.0-84-generic

Found linux image: /boot/vmlinuz-3.2.0-83-generic

Found initrd image: /boot/initrd.img-3.2.0-83-generic

Found linux image: /boot/vmlinuz-3.2.0-82-generic

Found initrd image: /boot/initrd.img-3.2.0-82-generic

Found linux image: /boot/vmlinuz-3.2.0-80-generic

Found initrd image: /boot/initrd.img-3.2.0-80-generic

Found linux image: /boot/vmlinuz-3.2.0-79-generic

Found initrd image: /boot/initrd.img-3.2.0-79-generic

Found linux image: /boot/vmlinuz-2.6.32-38-server

Found initrd image: /boot/initrd.img-2.6.32-38-server

Found memtest86+ image: /memtest86+.bin

done

After a reboot still no change.

Ran dpkg --get-selections | grep linux and got:

libselinux1                                     install

linux-firmware                                  install

linux-headers-3.2.0-101                         install

linux-headers-3.2.0-101-generic                 install

linux-headers-3.2.0-102                         install

linux-headers-3.2.0-102-generic                 install

linux-headers-3.2.0-104                         install

linux-headers-3.2.0-104-generic                 install

linux-headers-3.2.0-106                         install

linux-headers-3.2.0-106-generic                 install

linux-headers-3.2.0-107                         install

linux-headers-3.2.0-107-generic                 install

linux-headers-3.2.0-109                         install

linux-headers-3.2.0-109-generic                 install

linux-headers-3.2.0-110                         install

linux-headers-3.2.0-110-generic                 install

linux-headers-3.2.0-111                         install

linux-headers-3.2.0-111-generic                 install

linux-headers-3.2.0-113                         install

linux-headers-3.2.0-113-generic                 install

linux-headers-3.2.0-86                          install

linux-headers-3.2.0-86-generic                  install

linux-headers-3.2.0-87                          install

linux-headers-3.2.0-87-generic                  install

linux-headers-3.2.0-89                          install

linux-headers-3.2.0-89-generic                  install

linux-headers-3.2.0-91                          install

linux-headers-3.2.0-91-generic                  install

linux-headers-3.2.0-92                          install

linux-headers-3.2.0-92-generic                  install

linux-headers-3.2.0-93                          install

linux-headers-3.2.0-93-generic                  install

linux-headers-3.2.0-94                          install

linux-headers-3.2.0-94-generic                  install

linux-headers-3.2.0-95                          install

linux-headers-3.2.0-95-generic                  install

linux-headers-3.2.0-96                          install

linux-headers-3.2.0-96-generic                  install

linux-headers-3.2.0-97                          install

linux-headers-3.2.0-97-generic                  install

linux-headers-3.2.0-98                          install

linux-headers-3.2.0-98-generic                  install

linux-headers-3.2.0-99                          install

linux-headers-3.2.0-99-generic                  install

linux-headers-server                            install

linux-image-2.6.32-38-server                    install

linux-image-3.2.0-79-generic                    install

linux-image-3.2.0-80-generic                    install

linux-image-3.2.0-82-generic                    install

linux-image-3.2.0-83-generic                    install

linux-image-3.2.0-84-generic                    install

linux-image-3.2.0-85-generic                    install

linux-image-3.2.0-86-generic                    install

linux-image-3.2.0-87-generic                    install

linux-libc-dev                                  install

util-linux                                      install

Seems like there is no new linux images in that list.

However, when I ran sudo apt-cache policy linux-image-generic it listed the new version as a candidate (it's in french but you get it):

linux-image-generic:

  Installé : (aucun)

  Candidat : 3.2.0.113.129

 Table de version :

     3.2.0.113.129 0

        500 http://fr.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages

        500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages

     3.2.0.23.25 0

        500 http://fr.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages