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Gentoo Linux: CVE-2020-11743: Xen: Multiple vulnerabilities

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Gentoo Linux: CVE-2020-11743: Xen: Multiple vulnerabilities

Severity
2
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:P)
Published
04/14/2020
Created
06/16/2020
Added
06/15/2020
Modified
07/16/2020

Description

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.

Solution(s)

  • gentoo-linux-upgrade-app-emulation-xen
  • gentoo-linux-upgrade-app-emulation-xen-tools

References

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