CVE-2019-15794

Aliases:UBUNTU-CVE-2019-15794DEBIAN-CVE-2019-15794
Advisory lineage Upstream: 0 Downstream: 5
Modified
Published: 23 Apr 2020, 23:55
Last modified:16 Sept 2024, 19:52

Vulnerability Summary

Overall Risk (default)
medium
39/100
CVSS Score
7.2 HIGH
v2.0 (nvd)
EPSS Score
1.16% LOW
1% probability +0.78%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

23 Apr 2020, 23:55
Published
Vulnerability first disclosed
16 Sept 2024, 19:52
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
  • v3.1•MEDIUM•Score: 6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 7.2AV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 1.16%• Percentile: 66%

Techniques & Countermeasures

  • CWE-672•Operation on a Resource after Expiration or Release

    The product uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked.

Affected Systems

  • canonical•ubuntu_linux

    18.04 | 19.10

  • debian•linux

    all | < 5.16.7-1 | < 5.16.7-1 | < 5.16.7-1

  • ubuntu•linux

    all | all | all | all

  • ubuntu•linux-aws

    all | all | all | all

  • ubuntu•linux-aws-5.0

    < 5.0.0-1022.25~18.04.1

  • ubuntu•linux-aws-5.15

    all

  • ubuntu•linux-aws-6.14

    all

  • ubuntu•linux-aws-6.17

    all

  • ubuntu•linux-aws-6.8

    all

  • ubuntu•linux-aws-7.0

    all

  • ubuntu•linux-aws-fips

    all

  • ubuntu•linux-azure

    < 5.0.0-1027.29~18.04.1 | all | all | all | all

  • ubuntu•linux-azure-5.15

    all

  • ubuntu•linux-azure-5.3

    < 5.3.0-1008.9~18.04.1

  • ubuntu•linux-azure-6.11

    all

  • ubuntu•linux-azure-6.14

    all

  • ubuntu•linux-azure-6.17

    all

  • ubuntu•linux-azure-6.8

    all

  • ubuntu•linux-azure-7.0

    all

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde

    all | all | all | all | all

  • ubuntu•linux-azure-fde-6.14

    all

  • ubuntu•linux-azure-fde-6.17

    all

  • ubuntu•linux-azure-fde-6.8

    all

  • ubuntu•linux-azure-fde-7.0

    all

  • ubuntu•linux-azure-fips

    all

  • ubuntu•linux-azure-nvidia

    all

  • ubuntu•linux-azure-nvidia-6.14

    all

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-fips

    all

  • ubuntu•linux-gcp

    < 5.0.0-1026.27~18.04.1 | all | all | all | all

  • ubuntu•linux-gcp-5.15

    all

  • ubuntu•linux-gcp-5.3

    < 5.3.0-1009.10~18.04.1

  • ubuntu•linux-gcp-6.11

    all

  • ubuntu•linux-gcp-6.14

    all

  • ubuntu•linux-gcp-6.17

    all

  • ubuntu•linux-gcp-6.8

    all

  • ubuntu•linux-gcp-7.0

    all

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    all

  • ubuntu•linux-gke

    all | all | all | all

  • ubuntu•linux-gke-5.0

    < 5.0.0-1026.27~18.04.2

  • ubuntu•linux-gkeop

    all | all | all

  • ubuntu•linux-gkeop-5.15

    all

  • ubuntu•linux-hwe

    < 5.0.0-37.40~18.04.1

  • ubuntu•linux-hwe-5.15

    all

  • ubuntu•linux-hwe-6.11

    all

  • ubuntu•linux-hwe-6.14

    all

  • ubuntu•linux-hwe-6.17

    all

  • ubuntu•linux-hwe-6.8

    all

Showing first 50 affected entries in server-rendered view.

References (9)