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.
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
Source: MITRE
Published: 2020-12-11
Updated: 2021-05-21
Type: CWE-362
Base Score: 5.4
Vector: AV:L/AC:M/Au:N/C:P/I:N/A:C
Impact Score: 7.8
Exploitability Score: 3.4
Severity: MEDIUM
Base Score: 5.7
Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H
Impact Score: 5.2
Exploitability Score: 0.5
Severity: MEDIUM