Linux Kernel up to 4.15.8 mdio-bcm-unimac.c unimac_mdio_probe null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 4.15.8 and classified as problematic. Affected is the function unimac_mdio_probe of the file drivers/net/phy/mdio-bcm-unimac.c. This manipulation causes null pointer dereference. This vulnerability is registered as CVE-2018-8043. The attack needs to be launched locally. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in Linux Kernel up to 4.15.8 (Operating System). Affected by this vulnerability is the function unimac_mdio_probe of the file drivers/net/phy/mdio-bcm-unimac.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:

The unimac_mdio_probe function in drivers/net/phy/mdio-bcm-unimac.c in the Linux kernel through 4.15.8 does not validate certain resource availability, which allows local users to cause a denial of service (NULL pointer dereference).

The bug was discovered 03/10/2018. The weakness was published 03/10/2018 (Website). It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2018-8043 since 03/10/2018. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 108427 (Fedora 26 : kernel (2018-bf60ec1389)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277239 (Fedora Security Update for kernel (FEDORA-2018-cf76003e1f)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 6 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (108427) and SecurityFocus (BID 105987†). Similar entries are available at VDB-114232, VDB-114343 and VDB-127051. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 108427
Nessus Name: Fedora 26 : kernel (2018-bf60ec1389)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 64762
OpenVAS Name: Fedora Update for kernel FEDORA-2018-cf76003e1f
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: git.kernel.org

Timelineinfo

03/10/2018 🔍
03/10/2018 +0 days 🔍
03/10/2018 +0 days 🔍
03/10/2018 +0 days 🔍
03/11/2018 +1 days 🔍
03/16/2018 +5 days 🔍
03/19/2018 +3 days 🔍
11/20/2018 +246 days 🔍
02/21/2023 +1554 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2018-bf60ec1389
Status: Confirmed

CVE: CVE-2018-8043 (🔍)
GCVE (CVE): GCVE-0-2018-8043
GCVE (VulDB): GCVE-100-114355
SecurityFocus: 105987 - Linux Kernel CVE-2018-19407 Local Denial of Service Vulnerability
SecurityTracker: 1040749

See also: 🔍

Entryinfo

Created: 03/11/2018 08:32
Updated: 02/21/2023 09:20
Changes: 03/11/2018 08:32 (76), 01/12/2020 11:44 (5), 02/21/2023 09:17 (7), 02/21/2023 09:20 (1)
Complete: 🔍
Cache ID: 216:D3E:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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