Ubuntu security

USN-2911-1: Linux kernel vulnerability Ubuntu Security Notice USN-2911-1 22nd February, 2016 linux vulnerability A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 12.04 LTS Summary The system could be made to crash under certain conditions. Software description linux – Linux kernel Details It was discovered that the Linux kernel keyring subsystem contained a racebetween read and revoke operations. A local attacker could use this tocause a denial of service (system crash). Update instructions The problem can be corrected by updating your system to the following package version: Ubuntu 12.04 LTS: linux-image-3.2.0-99-generic-pae 3.2.0-99.139 linux-image-3.2.0-99-powerpc64-smp 3.2.0-99.139 linux-image-3.2.0-99-generic 3.2.0-99.139 linux-image-3.2.0-99-virtual 3.2.0-99.139 linux-image-3.2.0-99-highbank 3.2.0-99.139 linux-image-3.2.0-99-powerpc-smp 3.2.0-99.139 linux-image-3.2.0-99-omap 3.2.0-99.139 To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades. After a standard system update you need to reboot your computer to makeall the necessary changes. ATTENTION: Due to an unavoidable ABI change the [ more… ]

USN-2910-1: Linux kernel (Vivid HWE) vulnerabilities Ubuntu Security Notice USN-2910-1 22nd February, 2016 linux-lts-vivid vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 14.04 LTS Summary Several security issues were fixed in the kernel. Software description linux-lts-vivid – Linux hardware enablement kernel from Vivid Details halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,incorrectly propagated file attributes, including setuid. A localunprivileged attacker could use this to gain privileges. (CVE-2016-1576) halfdog discovered that OverlayFS in the Linux kernel incorrectlypropagated security sensitive extended attributes, such as POSIX ACLs. Alocal unprivileged attacker could use this to gain privileges.(CVE-2016-1575) It was discovered that the Linux kernel keyring subsystem contained a racebetween read and revoke operations. A local attacker could use this tocause a denial of service (system crash). (CVE-2015-7550) 郭永刚 discovered that the Linux kernel networking implementation [ more… ]

USN-2909-1: Linux kernel (Utopic HWE) vulnerabilities Ubuntu Security Notice USN-2909-1 22nd February, 2016 linux-lts-utopic vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 14.04 LTS Summary Several security issues were fixed in the kernel. Software description linux-lts-utopic – Linux hardware enablement kernel from Utopic Details halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,incorrectly propagated file attributes, including setuid. A localunprivileged attacker could use this to gain privileges. (CVE-2016-1576) halfdog discovered that OverlayFS in the Linux kernel incorrectlypropagated security sensitive extended attributes, such as POSIX ACLs. Alocal unprivileged attacker could use this to gain privileges.(CVE-2016-1575) It was discovered that the Linux kernel's Filesystem in Userspace (FUSE)implementation did not handle initial zero length segments properly. Alocal attacker could use this to cause a denial of service (unkillabletask). (CVE-2015-8785) Update instructions The problem can be [ more… ]

USN-2908-3: Linux kernel (Raspberry Pi 2) vulnerabilities Ubuntu Security Notice USN-2908-3 22nd February, 2016 linux-raspi2 vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 15.10 Summary Several security issues were fixed in the kernel. Software description linux-raspi2 – Linux kernel for Raspberry Pi 2 Details halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,incorrectly propagated file attributes, including setuid. A localunprivileged attacker could use this to gain privileges. (CVE-2016-1576) halfdog discovered that OverlayFS in the Linux kernel incorrectlypropagated security sensitive extended attributes, such as POSIX ACLs. Alocal unprivileged attacker could use this to gain privileges.(CVE-2016-1575) It was discovered that the Linux kernel did not properly enforce rlimitsfor file descriptors sent over UNIX domain sockets. A local attacker coulduse this to cause a denial of service. (CVE-2013-4312) It was discovered that the Linux kernel's [ more… ]

USN-2907-2: Linux kernel (Trusty HWE) vulnerabilities Ubuntu Security Notice USN-2907-2 22nd February, 2016 linux-lts-trusty vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 12.04 LTS Summary Several security issues were fixed in the kernel. Software description linux-lts-trusty – Linux hardware enablement kernel from Trusty Details halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,incorrectly propagated file attributes, including setuid. A localunprivileged attacker could use this to gain privileges. (CVE-2016-1576) halfdog discovered that OverlayFS in the Linux kernel incorrectlypropagated security sensitive extended attributes, such asPOSIX ACLs. A local unprivileged attacker could use this to gainprivileges. (CVE-2016-1575) It was discovered that the Linux kernel keyring subsystem contained a racebetween read and revoke operations. A local attacker could use this tocause a denial of service (system crash). (CVE-2015-7550) 郭永刚 discovered that the Linux kernel networking implementation [ more… ]