CVE-2018-18021
kernel: Privilege escalation on arm64 via KVM hypervisor
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.
arch/arm64/kvm/guest.c en KVM en el kernel de Linux en versiones anteriores a la 4.18.12 en la plataforma arm64 gestiona de manera incorrecta la llamada IOCTL KVM_SET_ON_REG. Esto puede ser explotado por atacantes que puedan crear máquinas virtuales. Un atacante puede redireccionar de forma arbitraria el flujo de control del hipervisor (con control de registro total). Un atacante también puede provocar una denegación de servicio (pánico del hipervisor) mediante una devolución de excepción ilegal. Esto ocurre debido a las restricciones insuficientes sobre el acceso del espacio de usuario al archivo de registro core y, además, debido a que la validación PSTATE.M no evita los modos de ejecución no planeados.
A vulnerability was discovered in the Linux kernel that allows an attacker to escalate privileges with using a 64-bit ARM architecture. A local attacker with permission to create KVM-based virtual machines can both panic the hypervisor by triggering an illegal exception return (resulting in a DoS) and to redirect execution elsewhere within the hypervisor with full register control, instead of causing a return to the guest.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2018-10-07 CVE Reserved
- 2018-10-07 CVE Published
- 2024-08-05 CVE Updated
- 2024-09-16 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-20: Improper Input Validation
CAPEC
References (15)
URL | Tag | Source |
---|---|---|
http://www.securityfocus.com/bid/105550 | Third Party Advisory |
URL | Date | SRC |
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URL | Date | SRC |
---|---|---|
https://access.redhat.com/errata/RHSA-2018:3656 | 2019-04-03 | |
https://usn.ubuntu.com/3821-1 | 2019-04-03 | |
https://usn.ubuntu.com/3821-2 | 2019-04-03 | |
https://usn.ubuntu.com/3931-1 | 2019-04-03 | |
https://usn.ubuntu.com/3931-2 | 2019-04-03 | |
https://www.debian.org/security/2018/dsa-4313 | 2019-04-03 | |
https://access.redhat.com/security/cve/CVE-2018-18021 | 2018-11-26 | |
https://bugzilla.redhat.com/show_bug.cgi?id=1635475 | 2018-11-26 |
Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 4.18.12 Search vendor "Linux" for product "Linux Kernel" and version " < 4.18.12" | - |
Affected
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Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04" | lts |
Affected
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Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04" | lts |
Affected
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