# Sequoia: A Local Privilege Escalation Vulnerability in Linux’s Filesystem

**URL:** <https://tzm.one/t/sequoia-a-local-privilege-escalation-vulnerability-in-linux-s-filesystem/5056>\
**Category:** Support\
**Tags:** it-team\
**Created:** [July 21, 2021, 10:53am UTC](https://tzm.one/t/sequoia-a-local-privilege-escalation-vulnerability-in-linux-s-filesystem/5056 "2021-07-21T10:53:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Kees](https://tzm.one/user_avatar/tzm.one/kees/32/8442_2.png) [@Kees](https://tzm.one/u/Kees)\
**Post date:** [July 21, 2021, 10:53am UTC](https://tzm.one/t/sequoia-a-local-privilege-escalation-vulnerability-in-linux-s-filesystem/5056/1 "2021-07-21T10:53:45Z")

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> **[Sequoia: A Local Privilege Escalation Vulnerability in Linux’s Filesystem...](https://blog.qualys.com/vulnerabilities-threat-research/2021/07/20/sequoia-a-local-privilege-escalation-vulnerability-in-linuxs-filesystem-layer-cve-2021-33909)**
>
> The Qualys Research Team has discovered a size\_t-to-int type conversion vulnerability in the Linux Kernel’s filesystem layer affecting most Linux operating systems. Any unprivileged user can gain root…

In case you host your own infra, and I guess the [@it-team](https://tzm.one/groups/it-team) does, please have a look at the above. A [public exploit](https://www.openwall.com/lists/oss-security/2021/07/20/1/1) is already available, luckily, also the patches 🙂

This is mostly important for shared systems, since local access is needed.

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**Author:** ![Kees](https://tzm.one/user_avatar/tzm.one/kees/32/8442_2.png) [@Kees](https://tzm.one/u/Kees)\
**Post date:** [July 21, 2021, 10:59am UTC](https://tzm.one/t/sequoia-a-local-privilege-escalation-vulnerability-in-linux-s-filesystem/5056/2 "2021-07-21T10:59:13Z")

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The `tzmc1` system is patched (which hosts the forum and Jitsi).

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**Author:** ![Kees](https://tzm.one/user_avatar/tzm.one/kees/32/8442_2.png) [@Kees](https://tzm.one/u/Kees)\
**Post date:** [July 24, 2021, 10:59am UTC](https://tzm.one/t/sequoia-a-local-privilege-escalation-vulnerability-in-linux-s-filesystem/5056/3 "2021-07-24T10:59:41Z")

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