USN-3776-2: Linux kernel (Xenial HWE) vulnerabilities
Severity
High
Vendor
Canonical Ubuntu
Versions Affected
- Canonical Ubuntu 14.04
Description
USN-3776-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS.
Jann Horn discovered that the vmacache subsystem did not properly handle sequence number overflows, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2018-17182)
It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information. (CVE-2018-15594)
It was discovered that microprocessors utilizing speculative execution and prediction of return addresses via Return Stack Buffer (RSB) may allow unauthorized memory reads via sidechannel attacks. An attacker could use this to expose sensitive information. (CVE-2018-15572)
It was discovered that a NULL pointer dereference could be triggered in the OCFS2 file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-18216)
It was discovered that a race condition existed in the raw MIDI driver for the Linux kernel, leading to a double free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-10902)
It was discovered that a stack-based buffer overflow existed in the iSCSI target implementation of the Linux kernel. A remote attacker could use this to cause a denial of service (system crash). (CVE-2018-14633)
It was discovered that the YUREX USB device driver for the Linux kernel did not properly restrict user space reads or writes. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-16276)
It was discovered that a memory leak existed in the IRDA subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (kernel memory exhaustion). (CVE-2018-6554)
It was discovered that a use-after-free vulnerability existed in the IRDA implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-6555)
CVEs contained in this USN include: CVE-2017-18216, CVE-2018-10902, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594, CVE-2018-16276, CVE-2018-17182, CVE-2018-6554, CVE-2018-6555
Affected Cloud Foundry Products and Versions
Severity is high unless otherwise noted.
- Cloud Foundry BOSH trusty-stemcells are vulnerable, including:
- 3586.x versions prior to 3586.46
- 3541.x versions prior to 3541.52
- 3468.x versions prior to 3468.73
- 3445.x versions prior to 3445.71
- 3421.x versions prior to 3421.86
- 3363.x versions prior to 3363.78
- All other stemcells not listed.
Mitigation
Users of affected products are strongly encouraged to follow one of the mitigations below:
- The Cloud Foundry project recommends upgrading the following BOSH trusty-stemcells:
- Upgrade 3586.x versions to 3586.46
- Upgrade 3541.x versions to 3541.52
- Upgrade 3468.x versions to 3468.73
- Upgrade 3445.x versions to 3445.71
- Upgrade 3421.x versions to 3421.86
- Upgrade 3363.x versions to 3363.78
- All other stemcells should be upgraded to the latest version available on bosh.io.
