Linux Kernel up to 5.6.4 Signal include/linux/sched.h exec_id integer overflow

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 5.6.4. This affects the function exec_id of the file include/linux/sched.h of the component Signal Handler. Performing a manipulation results in integer overflow. This vulnerability is identified as CVE-2020-12826. The attack is only possible with local access. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.6.4 (Operating System). It has been classified as critical. This affects the function exec_id of the file include/linux/sched.h of the component Signal Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

The weakness was released 05/12/2020. This vulnerability is uniquely identified as CVE-2020-12826 since 05/12/2020. Attacking locally is a requirement. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.6.5 eliminates this vulnerability.

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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

License

• open-source

Website

• Vendor: https://www.kernel.org/

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