Linux Kernel up to 5.6.7 on s390 arch/s390/lib/uaccess.c enable_sacf_uaccess race condition

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.6.7 on s390. It has been rated as critical. Affected by this issue is the function enable_sacf_uaccess in the library arch/s390/lib/uaccess.c. The manipulation leads to race condition. This vulnerability is referenced as CVE-2020-11884. The attack can only be performed from a local environment. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 5.6.7 on s390 (Operating System). This issue affects the function enable_sacf_uaccess in the library arch/s390/lib/uaccess.c. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel through 5.6.7 on the s390 platform, code execution may occur because of a race condition, as demonstrated by code in enable_sacf_uaccess in arch/s390/lib/uaccess.c that fails to protect against a concurrent page table upgrade, aka CID-3f777e19d171. A crash could also occur.

The weakness was published 04/29/2020 (Website). It is possible to read the advisory at debian.org. The identification of this vulnerability is CVE-2020-11884 since 04/17/2020. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

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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

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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