CVSS 7.8 · High EPSS 0,42%
Kerentanan Always-Incorrect Control Flow Implementation pada xen, fedoraproject fedora +2 lainnya. Skor CVSS 3.1 7.8 (High) menurut NVD.
An issue was discovered in Xen through 4.14.x. There are missing memory barriers when accessing/allocating an event channel. Event channels control structures can be accessed lockless as long as the port is considered to be valid. Such a sequence is missing an appropriate memory barrier (e.g., smp_*mb()) to prevent both the compiler and CPU from re-ordering access. A malicious guest may be able to cause a hypervisor crash resulting in a Denial of Service (DoS). Information leak and privilege escalation cannot be excluded. Systems running all versions of Xen are affected. Whether a system is vulnerable will depend on the CPU and compiler used to build Xen. For all systems, the presence and the scope of the vulnerability depend on the precise re-ordering performed by the compiler used to build Xen. We have not been able to survey compilers; consequently we cannot say which compiler(s) might produce vulnerable code (with which code generation options). GCC documentation clearly suggests that re-ordering is possible. Arm systems will also be vulnerable if the CPU is able to re-order memory access. Please consult your CPU vendor. x86 systems are only vulnerable if a compiler performs re-ordering.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| xen | xen | Semua versi hingga 4.14.0 |
| fedoraproject | fedora | Versi 31 |
| fedoraproject | fedora | Versi 32 |
| fedoraproject | fedora | Versi 33 |
| opensuse | leap | Versi 15.2 |
| debian | debian linux | Versi 10.0 |