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Canonical published today new Linux kernel security updates for all of its supported Ubuntu operating system releases to address up to six security vulnerabilities affecting all supported kernels.
The most important flaw patched in this new Ubuntu kernel security update is CVE-2021-3178, which was discovered in Linux kernel’s NFS implementation and affects the Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS releases. This could allow a remote attacker to bypass NFS access restrictions and traverse to other parts of the filesystem via READDIRPLUS when there’s an NFS export of a subdirectory of a file system.
Another vulnerability patched in this new Linux kernel security update is CVE-2020-36158, a flaw discovered in the Marvell WiFi-Ex device driver that could allow a local attacker to either crash the system by causing a denial of service or possibly execute arbitrary code. This affects all supported Ubuntu releases, including Ubuntu 20.10, Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS.
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