Linux Kernel up to 4.20.14 net/nfc/llcp_commands.c nfc_llcp_build_tlv null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.20.14. It has been classified as problematic. Affected by this vulnerability is the function nfc_llcp_build_tlv of the file net/nfc/llcp_commands.c. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2019-12818. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in Linux Kernel up to 4.20.14 (Operating System). Affected by this vulnerability is the function nfc_llcp_build_tlv of the file net/nfc/llcp_commands.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

An issue was discovered in the Linux kernel before 4.20.15. The nfc_llcp_build_tlv function in net/nfc/llcp_commands.c may return NULL. If the caller does not check for this, it will trigger a NULL pointer dereference. This will cause denial of service. This affects nfc_llcp_build_gb in net/nfc/llcp_core.c.

The weakness was disclosed 06/14/2019 as confirmed changelog (Website). The advisory is shared at mirrors.edge.kernel.org. This vulnerability is known as CVE-2019-12818 since 06/13/2019. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 247393 (Linux Distros Unpatched Vulnerability : CVE-2019-12818), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.20.15 eliminates this vulnerability. The upgrade is hosted for download at git.kernel.org.

The vulnerability is also documented in the vulnerability database at Tenable (247393). The entries VDB-135653, VDB-135722, VDB-135882 and VDB-135883 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 247393
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2019-12818

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.20.15
Patch: git.kernel.org

Timelineinfo

06/13/2019 🔍
06/14/2019 +1 days 🔍
06/14/2019 +0 days 🔍
08/11/2025 +2249 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: K91444306
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-12818 (🔍)
GCVE (CVE): GCVE-0-2019-12818
GCVE (VulDB): GCVE-100-136477
SecurityFocus: 108776

See also: 🔍

Entryinfo

Created: 06/14/2019 10:37
Updated: 08/11/2025 00:07
Changes: 06/14/2019 10:37 (62), 06/24/2020 10:40 (1), 10/05/2023 11:05 (6), 10/05/2023 11:13 (1), 08/11/2025 00:07 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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