CVE-2018-6557 (ubuntu_linux)
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The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-6557
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