UBUNTU-CVE-2021-44731

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UBUNTU-CVE-2021-44731

Summary:

Details: A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

References: https://ubuntu.com/security/CVE-2021-44731, https://ubuntu.com/security/notices/USN-5292-1, https://www.openwall.com/lists/oss-security/2022/02/17/2, https://github.com/snapcore/snapd/commit/f3f669d720ed8b0bcb73da7789843bf43b5c16cf, https://www.cve.org/CVERecord?id=CVE-2021-44731, https://ubuntu.com/security/notices/USN-5292-3, https://ubuntu.com/security/notices/USN-5292-2