CVE-2019-15793

2019-11-12T00:00:00
ID UB:CVE-2019-15793
Type ubuntucve
Reporter ubuntu.com
Modified 2019-11-12T00:00:00

Description

In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, several locations which shift ids translate user/group ids before performing operations in the lower filesystem were translating them into init_user_ns, whereas they should have been translated into the s_user_ns for the lower filesystem. This resulted in using ids other than the intended ones in the lower fs, which likely did not map into the shifts s_user_ns. A local attacker could use this to possibly bypass discretionary access control permissions.

Bugs

  • <https://bugs.launchpad.net/bugs/1850867>