NewsSecurity Vulnerabilities

Linux Kernel flush_tmregs_to_thread Function Denial of Service Vulnerability [CVE-2018-1091]

A vulnerability in the flush_tmregs_to_thread function of the Linux Kernel could allow a local attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerability is due to a missing processor feature check and an erroneous use of transactional memory (TM) instructions in the core dump path by the affected software. This occurs when the flush_tmregs_to_thread function, as defined in the arch/powerpc/kernel/ptrace.c source code file of the affected software, is used. An attacker could exploit this vulnerability by using unprivileged userspace during a core dump on a POWER host. A successful exploit could trigger a guest kernel crash, resulting in a DoS condition on the system. has confirmed the vulnerability and released software updates.

CVE number – CVE-2018-1091

  • To exploit this vulnerability, an attacker must have local access to the targeted system. This access requirement may reduce the likelihood of a successful exploit.
  • Administrators are advised to apply the appropriate updates.

    Administrators are advised to allow only trusted users to access local systems.

    Administrators are advised to monitor affected systems.

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Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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