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CVE-2015-7837

Status Candidate

Overview

The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot restrictions by leveraging improper handling of secure_boot flag across kexec reboot.

Related Files

Kernel Live Patch Security Notice LSN-0029-1
Posted Aug 30, 2017
Authored by Benjamin M. Romer

It was discovered that the Linux kernel did not honor the UEFI secure boot mode when performing a kexec operation. A local attacker could use this to bypass secure boot restrictions. Huang Weller discovered that the ext4 filesystem implementation in the Linux kernel mishandled a needs-flushing-before-commit list. A local attacker could use this to expose sensitive information.

tags | advisory, kernel, local
systems | linux
advisories | CVE-2015-7837, CVE-2017-7495
MD5 | e1cdddf8c51cfb6dc9e25a8466744db4
Ubuntu Security Notice USN-3405-2
Posted Aug 28, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3405-2 - USN-3405-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. It was discovered that a use-after-free vulnerability existed in the POSIX message queue implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, vulnerability
systems | linux, osx, ubuntu
advisories | CVE-2015-7837, CVE-2017-11176, CVE-2017-7495, CVE-2017-7541
MD5 | be8ba4251d1774d576a5d0cbdadc62c4
Ubuntu Security Notice USN-3405-1
Posted Aug 28, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3405-1 - It was discovered that a use-after-free vulnerability existed in the POSIX message queue implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Huang Weller discovered that the ext4 filesystem implementation in the Linux kernel mishandled a needs-flushing-before-commit list. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, osx, ubuntu
advisories | CVE-2015-7837, CVE-2017-11176, CVE-2017-7495, CVE-2017-7541
MD5 | 179b8f597770848ddee280743b07f0a7
Red Hat Security Advisory 2015-2411-01
Posted Nov 20, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-2411-01 - The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. A flaw was found in the way the Linux kernel's file system implementation handled rename operations in which the source was inside and the destination was outside of a bind mount. A privileged user inside a container could use this flaw to escape the bind mount and, potentially, escalate their privileges on the system. A race condition flaw was found in the way the Linux kernel's IPC subsystem initialized certain fields in an IPC object structure that were later used for permission checking before inserting the object into a globally visible list. A local, unprivileged user could potentially use this flaw to elevate their privileges on the system.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2013-7421, CVE-2014-8171, CVE-2014-9419, CVE-2014-9644, CVE-2015-2925, CVE-2015-3339, CVE-2015-4170, CVE-2015-5283, CVE-2015-7613, CVE-2015-7837
MD5 | 6352129f9d3299a279e67a270853b009
Red Hat Security Advisory 2015-2152-02
Posted Nov 20, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-2152-02 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A flaw was found in the way the Linux kernel's file system implementation handled rename operations in which the source was inside and the destination was outside of a bind mount. A privileged user inside a container could use this flaw to escape the bind mount and, potentially, escalate their privileges on the system. A race condition flaw was found in the way the Linux kernel's IPC subsystem initialized certain fields in an IPC object structure that were later used for permission checking before inserting the object into a globally visible list. A local, unprivileged user could potentially use this flaw to elevate their privileges on the system.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2010-5313, CVE-2013-7421, CVE-2014-3647, CVE-2014-7842, CVE-2014-8171, CVE-2014-9419, CVE-2014-9644, CVE-2015-0239, CVE-2015-2925, CVE-2015-3339, CVE-2015-4170, CVE-2015-5283, CVE-2015-6526, CVE-2015-7613, CVE-2015-7837
MD5 | 09dcc91b307a4f8109578372bf885600
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