CVE-2019-19318

Description

In the Linux kernel 5.3.11, mounting a crafted btrfs image twice can cause an rwsem_down_write_slowpath use-after-free because (in rwsem_can_spin_on_owner in kernel/locking/rwsem.c) rwsem_owner_flags returns an already freed pointer,

CVSS Metrics

• v3.1•MEDIUM•Score: 4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
• v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.35%• Percentile: 58%

Techniques & Countermeasures

• CWE-416•Use After Free

  The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

• canonical•ubuntu_linux

  14.04 | 16.04 | 18.04

• debian•debian_linux

  9.0

• linux•linux_kernel

  5.0.21 | 5.3.11

• netapp•active_iq_unified_manager

  ≥ 9.5

• netapp•aff_a400_firmware

  na

• netapp•aff_a700s

  na

• netapp•data_availability_services

  na

• netapp•fas8300_firmware

  na

• netapp•fas8700_firmware

  na

• netapp•h610s_firmware

  na

• netapp•hci_management_node

  na

• netapp•solidfire

  na

• netapp•steelstore_cloud_integrated_storage

  na

• opensuse•leap

  15.1

References (5)

• https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19318
• https://security.netapp.com/advisory/ntap-20200103-0001/
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
• https://usn.ubuntu.com/4414-1/
• https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html