CVE-2020-10711
MediumA 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 score
5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type
CWE-476CVE-2020-10711 is a NULL Pointer Dereference vulnerability
What is NULL Pointer Dereference?
The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE
References
The following references provide additional information about CVE-2020-10711 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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Mailing List Third Party Advisory
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Mailing List Third Party Advisory
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Third Party Advisory
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Third Party Advisory
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Ubuntu Securityhttps://usn.ubuntu.com/4411-1/Third Party Advisory
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Ubuntu Securityhttps://usn.ubuntu.com/4412-1/Third Party Advisory
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Ubuntu Securityhttps://usn.ubuntu.com/4413-1/Third Party Advisory
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Ubuntu Securityhttps://usn.ubuntu.com/4414-1/Third Party Advisory
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Ubuntu Securityhttps://usn.ubuntu.com/4419-1/Third Party Advisory
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Debian Securityhttps://www.debian.org/security/2020/dsa-4698Third Party Advisory
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Debian Securityhttps://www.debian.org/security/2020/dsa-4699Third Party Advisory
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PatchKernel patch commithttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10711
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PatchKernel patch commithttps://www.openwall.com/lists/oss-security/2020/05/12/2
Frequently asked questions
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What is CVE-2020-10711?
CVE-2020-10711 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.9 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . CVE-2020-10711 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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What is the CVSS score for CVE-2020-10711?
CVE-2020-10711 has a CVSS score of 5.9 out of 10, rated Medium severity (CVSS 3.1). The vector string is
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H. -
Is there a patch available for CVE-2020-10711?
No patch is currently available for CVE-2020-10711. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
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Is CVE-2020-10711 actively exploited?
No — CVE-2020-10711 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
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What is NULL Pointer Dereference (CWE-476)?
The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. View CWE-476 on MITRE CWE →