CVE-2020-15436

Description

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.

CVSS Metrics

• 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: 0.15%• Percentile: 35%

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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

• broadcom•brocade_fabric_operating_system

  na

• linux•linux_kernel

  ≥ 2.6.38, < 4.4.229 | ≥ 4.5, < 4.9.229 | ≥ 4.10, < 4.14.186 | ≥ 4.15, < 4.19.130 | ≥ 4.20, < 5.4.49 | ≥ 5.5, < 5.7.6

• netapp•a250_firmware

  na

• netapp•a700s_firmware

  na

• netapp•aff_500f_firmware

  na

• netapp•aff_8300_firmware

  na

• netapp•aff_8700_firmware

  na

• netapp•aff_a400_firmware

  na

• netapp•cloud_backup

  na

• netapp•fabric-attached_storage_a400_firmware

  na

• netapp•fas_500f_firmware

  na

• netapp•fas_8300_firmware

  na

• netapp•fas_8700_firmware

  na

• netapp•h410c_firmware

  na

• netapp•h610c_firmware

  na

• netapp•h610s_firmware

  na

• netapp•h615c_firmware

  na

• netapp•solidfire_\&_hci_management_node

  na

• netapp•solidfire_baseboard_management_controller_firmware

  na

References (2)

• https://lkml.org/lkml/2020/6/7/379
• https://security.netapp.com/advisory/ntap-20201218-0002/