Veracode Vulnerability DatabaseVERACODE:20219User-After-Free
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
Linux kernel is vulnerable to use-after-free attacks. This is because the way the Linux kernel’s KVM hypervisor emulates a preemption timer for L2 guests when nested (=1) virtualization is enabled. An attacker could use this flaw to crash the host kernel resulting in a denial of service or potentially gain privileged access to a system.
References
lists.opensuse.org/opensuse-security-announce/2019-02/msg00042.html
packetstormsecurity.com/files/151713/KVM-VMX-Preemption-Timer-Use-After-Free.html
www.openwall.com/lists/oss-security/2019/02/18/2
access.redhat.com/errata/RHBA-2019:0959
access.redhat.com/errata/RHSA-2019:0818
access.redhat.com/errata/RHSA-2019:0833
access.redhat.com/errata/RHSA-2019:3967
access.redhat.com/errata/RHSA-2019:4058
access.redhat.com/security/updates/classification/#important
bugs.chromium.org/p/project-zero/issues/detail?id=1760
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ecec76885bcfe3294685dc363fd1273df0d5d65f
github.com/torvalds/linux/commits/master/arch/x86/kvm
lists.debian.org/debian-lts-announce/2019/03/msg00034.html
lists.debian.org/debian-lts-announce/2019/04/msg00004.html
lists.debian.org/debian-lts-announce/2019/05/msg00002.html
lists.fedoraproject.org/archives/list/[email protected]/message/KDOXCX3QFVWYXH5CQMGDDE7H6MUG5XGG/
lists.fedoraproject.org/archives/list/[email protected]/message/Y2HMABEMJDPA6LPCBE5WIEZXUKY7DLTN/
security.netapp.com/advisory/ntap-20190404-0002/
support.f5.com/csp/article/K08413011
usn.ubuntu.com/3930-1/
usn.ubuntu.com/3930-2/
usn.ubuntu.com/3931-1/
usn.ubuntu.com/3931-2/
usn.ubuntu.com/3932-1/
usn.ubuntu.com/3932-2/
Related
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P