[USN-3695-1] Linux kernel vulnerabilities


–===============3567735216975324031==
Content-Type: multipart/signed; micalg=pgp-sha512;
protocol=”application/pgp-signature”; boundary=”OaZoDhBhXzo6bW1J”
Content-Disposition: inline

–OaZoDhBhXzo6bW1J
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline

==========================================================================
Ubuntu Security Notice USN-3695-1
July 02, 2018

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
– linux: Linux kernel
– linux-aws: Linux kernel for Amazon Web Services (AWS) systems
– linux-azure: Linux kernel for Microsoft Azure Cloud systems
– linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
– linux-kvm: Linux kernel for cloud environments
– linux-oem: Linux kernel for OEM processors
– linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

Wen Xu discovered that the ext4 file system implementation in the Linux
kernel did not properly initialize the crc32c checksum driver. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2018-1094)

It was discovered that the cdrom driver in the Linux kernel contained an
incorrect bounds check. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2018-10940)

Wen Xu discovered that the ext4 file system implementation in the Linux
kernel did not properly validate xattr sizes. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-1095)

Jann Horn discovered that the 32 bit adjtimex() syscall implementation for
64 bit Linux kernels did not properly initialize memory returned to user
space in some situations. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-11508)

It was discovered that an information leak vulnerability existed in the
floppy driver in the Linux kernel. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2018-7755)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
linux-image-4.15.0-1010-gcp 4.15.0-1010.10
linux-image-4.15.0-1011-aws 4.15.0-1011.11
linux-image-4.15.0-1012-kvm 4.15.0-1012.12
linux-image-4.15.0-1013-raspi2 4.15.0-1013.14
linux-image-4.15.0-1014-azure 4.15.0-1014.14
linux-image-4.15.0-24-generic 4.15.0-24.26
linux-image-4.15.0-24-generic-lpae 4.15.0-24.26
linux-image-4.15.0-24-lowlatency 4.15.0-24.26
linux-image-4.15.0-24-snapdragon 4.15.0-24.26
linux-image-aws 4.15.0.1011.11
linux-image-azure 4.15.0.1014.14
linux-image-gcp 4.15.0.1010.12
linux-image-generic 4.15.0.24.26
linux-image-generic-lpae 4.15.0.24.26
linux-image-gke 4.15.0.1010.12
linux-image-kvm 4.15.0.1012.12
linux-image-lowlatency 4.15.0.24.26
linux-image-oem 4.15.0.1009.11
linux-image-raspi2 4.15.0.1013.11
linux-image-snapdragon 4.15.0.24.26

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
https://usn.ubuntu.com/usn/usn-3695-1
CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508,
CVE-2018-7755

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-24.26
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1011.11
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1010.10
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1012.12
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1009.12
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1013.14

–OaZoDhBhXzo6bW1J
Content-Type: application/pgp-signature; name=”signature.asc”

—–BEGIN PGP SIGNATURE—–
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=f+nK
—–END PGP SIGNATURE—–

–OaZoDhBhXzo6bW1J–

–===============3567735216975324031==
Content-Type: text/plain; charset=”utf-8″
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Content-Disposition: inline

LS0gCnVidW50dS1zZWN1cml0eS1hbm5vdW5jZSBtYWlsaW5nIGxpc3QKdWJ1bnR1LXNlY3VyaXR5
LWFubm91bmNlQGxpc3RzLnVidW50dS5jb20KTW9kaWZ5IHNldHRpbmdzIG9yIHVuc3Vic2NyaWJl
IGF0OiBodHRwczovL2xpc3RzLnVidW50dS5jb20vbWFpbG1hbi9saXN0aW5mby91YnVudHUtc2Vj
dXJpdHktYW5ub3VuY2UK

–===============3567735216975324031==–