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computer vulnerability alert CVE-2018-7541

Xen: denial of service via a change of page table type

Synthesis of the vulnerability

Impacted products: XenServer, Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity: 1/4.
Consequences: denial of service on server, denial of service on service.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 27/02/2018.
Identifiers: CERTFR-2018-AVI-102, CERTFR-2018-AVI-145, CERTFR-2018-AVI-171, CTX232096, CTX232655, CVE-2018-7541, DLA-1300-1, DLA-1577-1, DSA-4131-1, FEDORA-2018-0746dac335, FEDORA-2018-c553a586c8, openSUSE-SU-2018:1274-1, SUSE-SU-2018:0678-1, SUSE-SU-2018:0909-1, SUSE-SU-2018:1184-1, VIGILANCE-VUL-25386, XSA-255.

Description of the vulnerability

A privileged attacker in a guest system can request a change of page table type to Xen without unmapping related pages, in order to make the host crash.
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