Debian Long Term Support / LTS Security Information / 2019 / Security Information -- DLA-1940-1 linux-4.9

Debian Security Advisory

DLA-1940-1 linux-4.9 -- LTS security update

Date Reported:

01 Oct 2019

Affected Packages:

linux-4.9

Vulnerable:

Yes

Security database references:

In Mitre's CVE dictionary: CVE-2019-14821, CVE-2019-14835, CVE-2019-15117, CVE-2019-15118, CVE-2019-15902.

More information:

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 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 Debian 8 Jessie, these problems have been fixed in version 4.9.189-3+deb9u1~deb8u1.

We recommend that you upgrade your linux-4.9 packages.

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