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Home > Linux > KernelCare patches a critical vulnerability affecting kernels from version 5.5-rc1 to 5.10.13

KernelCare patches a critical vulnerability affecting kernels from version 5.5-rc1 to 5.10.13

The KernelCare team announced that patches for a vulnerability affecting kernels from 5.5-rc1 to 5.10.13 are being delivered.

Erdem Yasar by Erdem Yasar
February 11, 2021
in Linux
1 min read
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KernelCare patches a critical vulnerability affecting kernels from version 5.5-rc1 to 5.10.13
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The KernelCare team announced that the patches addressing CVE-2021-26708 are currently being delivered. The vulnerability affects kernels starting from version 5.5-rc1 to 5.10.13. It is caused by an improperly handled race condition in the AF_VSOCK implementation, which is available to unprivileged users and shipped as a kernel module in all major distributions.

Privilege escalation and full system access

The vulnerability allows an unprivileged user to execute a malicious program, which provides privilege escalation, and as a consequence full system access. It was introduced as a part of a patch that also introduced multi-transport VSOCK and it would have locks in place that didn’t account for the possibility of a variable change on a different but related code path.

The vulnerability was disclosed on the OSS-Security mailing list and patches fixing it have been merged as of version 5.10.13, which is used on major distribution and receives vendor-supplied patches. KernelCare is now receiving patches for this vulnerability. KernelCare also allows users to patch it without waiting for a maintenance window or without rebooting the system. According to the announcement made by the company, EL8 already has patches ready, the other supported distributions will also receive them shortly.

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Tags: KernelCare
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Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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