CVEvulnerability

CVE-2019-15793

8.8 HIGH Published 2020-04-24 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-04-24
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0 ([email protected])
4.6 MEDIUM — AV:L/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-276, CWE-538

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.

Affected configurations

• linux linux kernel 5.0 • linux linux kernel 5.3 • canonical ubuntu linux 18.04 • canonical ubuntu linux 19.04

Related

Weakness · CWE (2)

  • CWE-276 Incorrect Default Permissions weakness
  • CWE-538 Insertion of Sensitive Information into Externally-Accessible File or Directory weakness

References