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Ubuntu: (Multiple Advisories) (CVE-2019-15794): Linux kernel vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2019-15794): Linux kernel vulnerabilities

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
12/02/2019
Created
12/05/2019
Added
12/03/2019
Modified
09/12/2020

Description

Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow.

Solution(s)

  • ubuntu-upgrade-linux-image-5-0-0-1008-oracle
  • ubuntu-upgrade-linux-image-5-0-0-1022-aws
  • ubuntu-upgrade-linux-image-5-0-0-1023-kvm
  • ubuntu-upgrade-linux-image-5-0-0-1023-raspi2
  • ubuntu-upgrade-linux-image-5-0-0-1026-gcp
  • ubuntu-upgrade-linux-image-5-0-0-1026-gke
  • ubuntu-upgrade-linux-image-5-0-0-1030-oem-osp1
  • ubuntu-upgrade-linux-image-5-0-0-37-generic
  • ubuntu-upgrade-linux-image-5-0-0-37-generic-lpae
  • ubuntu-upgrade-linux-image-5-0-0-37-lowlatency
  • ubuntu-upgrade-linux-image-5-3-0-1007-oracle
  • ubuntu-upgrade-linux-image-5-3-0-1008-aws
  • ubuntu-upgrade-linux-image-5-3-0-1008-kvm
  • ubuntu-upgrade-linux-image-5-3-0-1009-gcp
  • ubuntu-upgrade-linux-image-5-3-0-24-generic
  • ubuntu-upgrade-linux-image-5-3-0-24-generic-lpae
  • ubuntu-upgrade-linux-image-5-3-0-24-lowlatency
  • ubuntu-upgrade-linux-image-5-3-0-24-snapdragon
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-aws-edge
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-gcp-edge
  • 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-oracle-edge
  • 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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