Linux Kernel up to 5.6.10 gss_mech_switch.c gss_mech_free release of resource ⚔ [Disputed]

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.6.10 and classified as problematic. This impacts the function gss_mech_free of the file net/sunrpc/auth_gss/gss_mech_switch.c. The manipulation results in release of resource. This vulnerability is identified as CVE-2020-12656. The attack is only possible with local access. There is not any exploit available. There are still doubts about whether this vulnerability truly exists.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 5.6.10 (Operating System). Affected is the function gss_mech_free of the file net/sunrpc/auth_gss/gss_mech_switch.c. The manipulation with an unknown input leads to a release of resource vulnerability. CWE is classifying the issue as CWE-772. The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. This is going to have an impact on availability. CVE summarizes:

gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in the rpcsec_gss_krb5 implementation in the Linux kernel through 5.6.10 lacks certain domain_release calls, leading to a memory leak. Note: This was disputed with the assertion that the issue does not grant any access not already available. It is a problem that on unloading a specific kernel module some memory is leaked, but loading kernel modules is a privileged operation. A user could also write a kernel module to consume any amount of memory they like and load that replicating the effect of this bug

The weakness was released 05/05/2020. This vulnerability is traded as CVE-2020-12656 since 05/05/2020. The exploitability is told to be easy. Local access is required to approach this attack. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

The real existence of this vulnerability is still doubted at the moment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at VDB-154748, VDB-154747, VDB-154745 and VDB-154744. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.6.0
• 5.6.1
• 5.6.2
• 5.6.3
• 5.6.4
• 5.6.5
• 5.6.6
• 5.6.7
• 5.6.8
• 5.6.9
• 5.6.10

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Exploitinginfo

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Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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