A linux kernel security update has been released for Debian GNU/Linux 10 to address several vulnerabilities in the Linux kernel that may lead to the execution of arbitrary code, privilege escalation, denial of service or information leaks.

DSA 4774-1: linux security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-4774-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
October 19, 2020   https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : linux
CVE ID : CVE-2020-12351 CVE-2020-12352 CVE-2020-25211 CVE-2020-25643
CVE-2020-25645
Debian Bug : 908712

Several vulnerabilities have been discovered in the Linux kernel that
may lead to the execution of arbitrary code, privilege escalation,
denial of service or information leaks.

CVE-2020-12351

Andy Nguyen discovered a flaw in the Bluetooth implementation in the
way L2CAP packets with A2MP CID are handled. A remote attacker in
short distance knowing the victim's Bluetooth device address can
send a malicious l2cap packet and cause a denial of service or
possibly arbitrary code execution with kernel privileges.

CVE-2020-12352

Andy Nguyen discovered a flaw in the Bluetooth implementation. Stack
memory is not properly initialised when handling certain AMP
packets. A remote attacker in short distance knowing the victim's
Bluetooth device address address can retrieve kernel stack
information.

CVE-2020-25211

A flaw was discovered in netfilter subsystem. A local attacker
able to inject conntrack Netlink configuration can cause a denial
of service.

CVE-2020-25643

ChenNan Of Chaitin Security Research Lab discovered a flaw in the
hdlc_ppp module. Improper input validation in the ppp_cp_parse_cr()
function may lead to memory corruption and information disclosure.

CVE-2020-25645

A flaw was discovered in the interface driver for GENEVE
encapsulated traffic when combined with IPsec. If IPsec is
configured to encrypt traffic for the specific UDP port used by the
GENEVE tunnel, tunneled data isn't correctly routed over the
encrypted link and sent unencrypted instead.

For the stable distribution (buster), these problems have been fixed in
version 4.19.152-1. The vulnerabilities are fixed by rebasing to the new
stable upstream version 4.19.152 which includes additional bugfixes.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/linux

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/