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Vulnerability record · CVE-2020-25643 · published 6 October 2020

CVE-2020-25643: Linux kernel improper input validation vulnerability

Linux · Linux Kernel

A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7. Memory corruption and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause the system to crash or cause a denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

7.2 CVSS 3.1 High EPSS 3.3% · top 12.0% CWE-20 · Improper input validation
7.2CVSS 3.1 base score, v2 7.5
3.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7. Memory corruption and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause the system to crash or cause a denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1879981 Issue TrackingPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66d42ed8b25b64eb63111a2b8582c5afc8bf1105 Mailing ListPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20201103-0002/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4774 Third Party Advisory
https://www.starwindsoftware.com/security/sw-20210325-0002/ Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1879981 Issue TrackingPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66d42ed8b25b64eb63111a2b8582c5afc8bf1105 Mailing ListPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20201103-0002/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4774 Third Party Advisory
https://www.starwindsoftware.com/security/sw-20210325-0002/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-25643), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.