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computer vulnerability CVE-2018-7540

Xen: denial of service via the L3/L4 page table management

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, denial of service on client.
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-2018-7540, 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-25385, XSA-252.

Description of the vulnerability

A privileged attacker in a guest system can make interrupt processing too long by requesting Xen to change the L3/L4 page tables, in order to trigger a denial of service.
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