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Vulnerability record · CVE-2020-10711 · published 22 May 2020

CVE-2020-10711: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.

5.9 CVSS 3.1 Medium EPSS 3.1% · top 12.8% CWE-476 · NULL pointer dereference
5.9CVSS 3.1 base score, v2 4.3
3.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
11Affected product versions listed by NVD
26References
17 Jun 2026Last modified by NVD

Description

A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10711 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html Third Party Advisory
https://security.netapp.com/advisory/ntap-20200608-0001/ Third Party Advisory
https://usn.ubuntu.com/4411-1/ Third Party Advisory
https://usn.ubuntu.com/4412-1/ Third Party Advisory
https://usn.ubuntu.com/4413-1/ Third Party Advisory
https://usn.ubuntu.com/4414-1/ Third Party Advisory
https://usn.ubuntu.com/4419-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4698 Third Party Advisory
https://www.debian.org/security/2020/dsa-4699 Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/05/12/2 Mailing ListPatchThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10711 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html Third Party Advisory
https://security.netapp.com/advisory/ntap-20200608-0001/ Third Party Advisory
https://usn.ubuntu.com/4411-1/ Third Party Advisory
https://usn.ubuntu.com/4412-1/ Third Party Advisory
https://usn.ubuntu.com/4413-1/ Third Party Advisory
https://usn.ubuntu.com/4414-1/ Third Party Advisory
https://usn.ubuntu.com/4419-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4698 Third Party Advisory
https://www.debian.org/security/2020/dsa-4699 Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/05/12/2 Mailing ListPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-10711), CISA KEV, FIRST EPSS (scores of 2026-09-30). This page is refreshed as NVD updates the record.