CVE-2020-27825

Description

A use-after-free flaw was found in kernel/trace/ring_buffer.c in Linux kernel (before 5.10-rc1). There was a race problem in trace_open and resize of cpu buffer running parallely on different cpus, may cause a denial of service problem (DOS). This flaw could even allow a local attacker with special user privilege to a kernel information leak threat.

CVSS Metrics

• v3.1•MEDIUM•Score: 5.7CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H
• v2.0•MEDIUM•Score: 5.4AV:L/AC:M/Au:N/C:P/I:N/A:C

EPSS Trends

Current EPSS score: 0.14%• Percentile: 33%

Techniques & Countermeasures

• CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

  The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Systems

• debian•debian_linux

  9.0 | 10.0

• linux•linux_kernel

  5.10:rc1

• netapp•cloud_backup

  na

• netapp•h410c_firmware

  na

• netapp•solidfire_baseboard_management_controller_firmware

  na

• redhat•enterprise_linux

  7.0 | 8.0

• redhat•enterprise_mrg

  2.0

References (5)

• https://bugzilla.redhat.com/show_bug.cgi?id=1905155
• https://www.debian.org/security/2021/dsa-4843
• https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
• https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
• https://security.netapp.com/advisory/ntap-20210521-0008/