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Vulnerability record · CVE-2020-27825 · published 11 December 2020

CVE-2020-27825: Linux kernel race condition vulnerability

Linux · Linux Kernel

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.

5.7 CVSS 3.1 Medium EPSS 0.28% · top 81.3% CWE-362 · Race condition
5.7CVSS 3.1 base score, v2 5.4
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1905155 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20210521-0008/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4843 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1905155 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20210521-0008/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4843 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-27825), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.