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AUSCERT External Security Bulletin Redistribution
ESB-2019.3613
linux security update
25 September 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Debian
Operating System: Debian GNU/Linux 9
Debian GNU/Linux 10
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-15902 CVE-2019-15118 CVE-2019-15117
CVE-2019-14835 CVE-2019-14821
Reference: ESB-2019.3572.3
ESB-2019.3570
ESB-2019.3536
Original Bulletin:
http://www.debian.org/security/2019/dsa-4531
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Debian Security Advisory DSA-4531-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
September 25, 2019 https://www.debian.org/security/faq
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Package : linux
CVE ID : CVE-2019-14821 CVE-2019-14835 CVE-2019-15117 CVE-2019-15118
CVE-2019-15902
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.
CVE-2019-14821
Matt Delco reported a race condition in KVM's coalesced MMIO
facility, which could lead to out-of-bounds access in the kernel.
A local attacker permitted to access /dev/kvm could use this to
cause a denial of service (memory corruption or crash) or possibly
for privilege escalation.
CVE-2019-14835
Peter Pi of Tencent Blade Team discovered a missing bounds check
in vhost_net, the network back-end driver for KVM hosts, leading
to a buffer overflow when the host begins live migration of a VM.
An attacker in control of a VM could use this to cause a denial of
service (memory corruption or crash) or possibly for privilege
escalation on the host.
CVE-2019-15117
Hui Peng and Mathias Payer reported a missing bounds check in the
usb-audio driver's descriptor parsing code, leading to a buffer
over-read. An attacker able to add USB devices could possibly use
this to cause a denial of service (crash).
CVE-2019-15118
Hui Peng and Mathias Payer reported unbounded recursion in the
usb-audio driver's descriptor parsing code, leading to a stack
overflow. An attacker able to add USB devices could use this to
cause a denial of service (memory corruption or crash) or possibly
for privilege escalation. On the amd64 architecture, and on the
arm64 architecture in buster, this is mitigated by a guard page
on the kernel stack, so that it is only possible to cause a crash.
CVE-2019-15902
Brad Spengler reported that a backporting error reintroduced a
spectre-v1 vulnerability in the ptrace subsystem in the
ptrace_get_debugreg() function.
For the oldstable distribution (stretch), these problems have been fixed
in version 4.9.189-3+deb9u1.
For the stable distribution (buster), these problems have been fixed in
version 4.19.67-2+deb10u1.
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/
Mailing list: debian-security-announce@lists.debian.org
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