--===============6729511444268930676==
Content-Type: multipart/signed; micalg=pgp-sha512;
	protocol="application/pgp-signature";
 boundary="BRE3mIcgqKzpedwo"
Content-Disposition: inline


--BRE3mIcgqKzpedwo
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline

==========================================================================
Ubuntu Security Notice USN-4915-1
April 15, 2021

linux-oem-5.6 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-oem-5.6: Linux kernel for OEM systems

Details:

It was discovered that the overlayfs implementation in the Linux kernel did
not properly validate the application of file system capabilities with
respect to user namespaces. A local attacker could use this to gain
elevated privileges. (CVE-2021-3493)

Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux
kernel did not properly handle faults in copy_from_user() when passing
through ioctls to an underlying file system. A local attacker could use
this to cause a denial of service (memory exhaustion) or execute arbitrary
code. (CVE-2021-3492)

Update instructions:

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

Ubuntu 20.04 LTS:
  linux-image-5.6.0-1054-oem      5.6.0-1054.58
  linux-image-oem-20.04           5.6.0.1054.50

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://ubuntu.com/security/notices/USN-4915-1
  CVE-2021-3492, CVE-2021-3493

Package Information:
  https://launchpad.net/ubuntu/+source/linux-oem-5.6/5.6.0-1054.58


--BRE3mIcgqKzpedwo
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----
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=abpa
-----END PGP SIGNATURE-----

--BRE3mIcgqKzpedwo--


--===============6729511444268930676==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Content-Disposition: inline

-- 
ubuntu-security-announce mailing list
ubuntu-security-announce@lists.ubuntu.com
Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce