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vulnerability alert CVE-2018-18955

Linux kernel: privilege escalation via User Namespace map_write

Synthesis of the vulnerability

Impacted products: Linux, Ubuntu.
Severity: 2/4.
Consequences: administrator access/rights, privileged access/rights, data reading, data creation/edition.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 14/11/2018.
Identifiers: 1712, 1798863, CERTFR-2018-AVI-581, CERTFR-2018-AVI-583, CVE-2018-18955, USN-3832-1, USN-3833-1, USN-3835-1, USN-3836-1, USN-3836-2, VIGILANCE-VUL-27781.

Description of the vulnerability

An attacker can bypass restrictions via User Namespace map_write() of the Linux kernel, in order to escalate his privileges.
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