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Ubuntu: (Multiple Advisories) (CVE-2019-15793): Linux kernel vulnerability and regression

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Ubuntu: (Multiple Advisories) (CVE-2019-15793): Linux kernel vulnerability and regression

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:P/I:P/A:P)
Published
11/13/2019
Created
11/15/2019
Added
11/14/2019
Modified
09/12/2020

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.

Solution(s)

  • ubuntu-upgrade-linux-image-5-0-0-1007-oracle
  • ubuntu-upgrade-linux-image-5-0-0-1021-aws
  • ubuntu-upgrade-linux-image-5-0-0-1022-kvm
  • ubuntu-upgrade-linux-image-5-0-0-1022-raspi2
  • ubuntu-upgrade-linux-image-5-0-0-1025-azure
  • ubuntu-upgrade-linux-image-5-0-0-1025-gcp
  • ubuntu-upgrade-linux-image-5-0-0-1025-gke
  • ubuntu-upgrade-linux-image-5-0-0-1027-oem-osp1
  • ubuntu-upgrade-linux-image-5-0-0-1028-oem-osp1
  • ubuntu-upgrade-linux-image-5-0-0-35-generic
  • ubuntu-upgrade-linux-image-5-0-0-35-generic-lpae
  • ubuntu-upgrade-linux-image-5-0-0-35-lowlatency
  • ubuntu-upgrade-linux-image-5-0-0-36-generic
  • ubuntu-upgrade-linux-image-5-0-0-36-generic-lpae
  • ubuntu-upgrade-linux-image-5-0-0-36-lowlatency
  • ubuntu-upgrade-linux-image-5-3-0-1006-oracle
  • ubuntu-upgrade-linux-image-5-3-0-1007-aws
  • ubuntu-upgrade-linux-image-5-3-0-1007-azure
  • ubuntu-upgrade-linux-image-5-3-0-1007-kvm
  • ubuntu-upgrade-linux-image-5-3-0-1008-gcp
  • ubuntu-upgrade-linux-image-5-3-0-1012-raspi2
  • ubuntu-upgrade-linux-image-5-3-0-22-generic
  • ubuntu-upgrade-linux-image-5-3-0-22-generic-lpae
  • ubuntu-upgrade-linux-image-5-3-0-22-lowlatency
  • ubuntu-upgrade-linux-image-5-3-0-22-snapdragon
  • ubuntu-upgrade-linux-image-5-3-0-23-generic
  • ubuntu-upgrade-linux-image-5-3-0-23-generic-lpae
  • ubuntu-upgrade-linux-image-5-3-0-23-lowlatency
  • ubuntu-upgrade-linux-image-5-3-0-23-snapdragon
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-hwe-18-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-18-04
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-gke-5-0
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
  • ubuntu-upgrade-linux-image-oem-osp1
  • ubuntu-upgrade-linux-image-oracle
  • ubuntu-upgrade-linux-image-raspi2
  • ubuntu-upgrade-linux-image-snapdragon
  • ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-hwe-18-04

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