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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: canonical

Published: 2020-04-23T23:55:24.581625Z

Updated: 2024-09-16T16:58:57.384Z

Reserved: 2019-08-29T00:00:00

Link: CVE-2019-15793

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2020-04-24T00:15:11.840

Modified: 2020-05-01T14:48:27.317

Link: CVE-2019-15793

cve-icon Redhat

No data.