==========================================================================
Ubuntu Security Notice USN-5708-1
November 01, 2022

backport-iwlwifi-dkms vulnerabilities
==========================================================================

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in backport-iwlwifi-dkms.

Software Description:
- backport-iwlwifi-dkms: iwlwifi driver backport in DKMS format

Details:

Sönke Huster discovered that an integer overflow vulnerability existed in
the WiFi driver stack in the Linux kernel, leading to a buffer overflow. A
physically proximate attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-41674)

Sönke Huster discovered that a use-after-free vulnerability existed in the
WiFi driver stack in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2022-42719)

Sönke Huster discovered that the WiFi driver stack in the Linux kernel did
not properly perform reference counting in some situations, leading to a
use-after-free vulnerability. A physically proximate attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2022-42720)

Sönke Huster discovered that the WiFi driver stack in the Linux kernel did
not properly handle BSSID/SSID lists in some situations. A physically
proximate attacker could use this to cause a denial of service (infinite
loop). (CVE-2022-42721)

Sönke Huster discovered that the WiFi driver stack in the Linux kernel
contained a NULL pointer dereference vulnerability in certain situations. A
physically proximate attacker could use this to cause a denial of service
(system crash). This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.10.
(CVE-2022-42722)

Update instructions:

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

Ubuntu 22.10:
  backport-iwlwifi-dkms           9904-0ubuntu3.1

Ubuntu 22.04 LTS:
  backport-iwlwifi-dkms           9858-0ubuntu3.1

Ubuntu 20.04 LTS:
  backport-iwlwifi-dkms           8324-0ubuntu3~20.04.5

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5708-1
  CVE-2022-41674, CVE-2022-42719, CVE-2022-42720, CVE-2022-42721,
  CVE-2022-42722, https://launchpad.net/bugs/1994525

Package Information:
  https://launchpad.net/ubuntu/+source/backport-iwlwifi-dkms/9904-0ubuntu3.1
  https://launchpad.net/ubuntu/+source/backport-iwlwifi-dkms/9858-0ubuntu3.1
  https://launchpad.net/ubuntu/+source/backport-iwlwifi-dkms/8324-0ubuntu3~20.04.5