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Debian Security Advisory 4465-1

Debian Security Advisory 4465-1
Posted Jun 19, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4465-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2019-10126, CVE-2019-11477, CVE-2019-11478, CVE-2019-11479, CVE-2019-11486, CVE-2019-11599, CVE-2019-11815, CVE-2019-11833, CVE-2019-11884, CVE-2019-3846, CVE-2019-5489, CVE-2019-9500, CVE-2019-9503
MD5 | a2e7d7ad8cd5265b8a90186bcd82ff4d

Debian Security Advisory 4465-1

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- -------------------------------------------------------------------------
Debian Security Advisory DSA-4465-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
June 17, 2019 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : linux
CVE ID : CVE-2019-3846 CVE-2019-5489 CVE-2019-9500 CVE-2019-9503
CVE-2019-10126 CVE-2019-11477 CVE-2019-11478 CVE-2019-11479
CVE-2019-11486 CVE-2019-11599 CVE-2019-11815 CVE-2019-11833
Debian Bug : 928989

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information

CVE-2019-3846, CVE-2019-10126

huangwen reported multiple buffer overflows in the Marvell wifi
(mwifiex) driver, which a local user could use to cause denial of
service or the execution of arbitrary code.


Daniel Gruss, Erik Kraft, Trishita Tiwari, Michael Schwarz, Ari
Trachtenberg, Jason Hennessey, Alex Ionescu, and Anders Fogh
discovered that local users could use the mincore() system call to
obtain sensitive information from other processes that access the
same memory-mapped file.

CVE-2019-9500, CVE-2019-9503

Hugues Anguelkov discovered a buffer overflow and missing access
validation in the Broadcom FullMAC wifi driver (brcmfmac), which a
attacker on the same wifi network could use to cause denial of
service or the execution of arbitrary code.


Jonathan Looney reported that a specially crafted sequence of TCP
selective acknowledgements (SACKs) allows a remotely triggerable
kernel panic.


Jonathan Looney reported that a specially crafted sequence of TCP
selective acknowledgements (SACKs) will fragment the TCP
retransmission queue, allowing an attacker to cause excessive
resource usage.


Jonathan Looney reported that an attacker could force the Linux
kernel to segment its responses into multiple TCP segments, each of
which contains only 8 bytes of data, drastically increasing the
bandwidth required to deliver the same amount of data.

This update introduces a new sysctl value to control the minimal MSS
(net.ipv4.tcp_min_snd_mss), which by default uses the formerly hard-
coded value of 48. We recommend raising this to 536 unless you know
that your network requires a lower value.


Jann Horn of Google reported numerous race conditions in the
Siemens R3964 line discipline. A local user could use these to
cause unspecified security impact. This module has therefore been


Jann Horn of Google reported a race condition in the core dump
implementation which could lead to a use-after-free. A local
user could use this to read sensitive information, to cause a
denial of service (memory corruption), or for privilege


It was discovered that a use-after-free in the Reliable Datagram
Sockets protocol could result in denial of service and potentially
privilege escalation. This protocol module (rds) is not auto-
loaded on Debian systems, so this issue only affects systems where
it is explicitly loaded.


It was discovered that the ext4 filesystem implementation writes
uninitialised data from kernel memory to new extent blocks. A
local user able to write to an ext4 filesystem and then read the
filesystem image, for example using a removable drive, might be
able to use this to obtain sensitive information.


It was discovered that the Bluetooth HIDP implementation did not
ensure that new connection names were null-terminated. A local
user with CAP_NET_ADMIN capability might be able to use this to
obtain sensitive information from the kernel stack.

For the stable distribution (stretch), these problems have been fixed in
version 4.9.168-1+deb9u3.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security
tracker page at:

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/

Mailing list: debian-security-announce@lists.debian.org



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