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CVE-2015-8539

Status Candidate

Overview

The KEYS subsystem in the Linux kernel before 4.4 allows local users to gain privileges or cause a denial of service (BUG) via crafted keyctl commands that negatively instantiate a key, related to security/keys/encrypted-keys/encrypted.c, security/keys/trusted.c, and security/keys/user_defined.c.

Related Files

Ubuntu Security Notice USN-3798-2
Posted Oct 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3798-2 - USN-3798-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 LTS. Dmitry Vyukov discovered that the key management subsystem in the Linux kernel did not properly restrict adding a key that already exists but is negatively instantiated. 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, ubuntu
advisories | CVE-2015-8539, CVE-2016-7913, CVE-2017-0794, CVE-2017-15299, CVE-2017-18216, CVE-2018-1000004, CVE-2018-7566, CVE-2018-9518
MD5 | bfdc7594d98be96ce72f6fbcd1096bfb
Ubuntu Security Notice USN-3798-1
Posted Oct 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3798-1 - Dmitry Vyukov discovered that the key management subsystem in the Linux kernel did not properly restrict adding a key that already exists but is negatively instantiated. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a use-after-free vulnerability existed in the device driver for XCeive xc2028/xc3028 tuners 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
systems | linux, ubuntu
advisories | CVE-2015-8539, CVE-2016-7913, CVE-2017-0794, CVE-2017-15299, CVE-2017-18216, CVE-2018-1000004, CVE-2018-7566, CVE-2018-9518
MD5 | bec3cbcb9fd27fc7ef0ed57a2e374431
Red Hat Security Advisory 2018-0152-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0152-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix: A flaw was found in the Linux kernel's key management system where it was possible for an attacker to escalate privileges or crash the machine. If a user key gets negatively instantiated, an error code is cached in the payload area. A negatively instantiated key may be then be positively instantiated by updating it with valid data. However, the ->update key type method must be aware that the error code may be there.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2015-8539, CVE-2017-15649, CVE-2017-7472
MD5 | 7ea7c52ac4b3e69c0c6b30b1a1ecc618
Red Hat Security Advisory 2018-0151-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0151-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions. There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty. Please refer to References section for further information about this issue and the performance impact.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2015-8539, CVE-2017-12192, CVE-2017-12193, CVE-2017-15649, CVE-2017-7472
MD5 | 63358454c05371266a1bc969d13515ca
Red Hat Security Advisory 2018-0181-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0181-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix: A flaw was found in the Linux kernel's key management system where it was possible for an attacker to escalate privileges or crash the machine. If a user key gets negatively instantiated, an error code is cached in the payload area. A negatively instantiated key may be then be positively instantiated by updating it with valid data. However, the ->update key type method must be aware that the error code may be there.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2015-8539, CVE-2017-15649, CVE-2017-7472
MD5 | ceddb62691f1c5db1132685413f4438b
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