CVE-2018-18021
This is exploitable by attackers who can create virtual machines.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.59%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 7.1 HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- EPSS
- 0.59% probability · 48th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- linux/linux kernel · debian/debian linux · canonical/ubuntu linux
- Source
- cve@mitre.org
EPSS 0.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279Patch
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d26c25a9d19b5976b319af528886f89cf455692dPatch
- http://www.securityfocus.com/bid/105550Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3656Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12Patch
- https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279Patch
- https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692dPatch
- https://usn.ubuntu.com/3821-1/Third Party Advisory
- https://usn.ubuntu.com/3821-2/Third Party Advisory
- https://usn.ubuntu.com/3931-1/
- https://usn.ubuntu.com/3931-2/
- https://www.debian.org/security/2018/dsa-4313Third Party Advisory
- https://www.openwall.com/lists/oss-security/2018/10/02/2Mailing List, Patch, Third Party Advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279Patch
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d26c25a9d19b5976b319af528886f89cf455692dPatch
- http://www.securityfocus.com/bid/105550Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3656Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12Patch
- https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279Patch
- https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692dPatch
- https://usn.ubuntu.com/3821-1/Third Party Advisory
- https://usn.ubuntu.com/3821-2/Third Party Advisory
- https://usn.ubuntu.com/3931-1/
- https://usn.ubuntu.com/3931-2/
- https://www.debian.org/security/2018/dsa-4313Third Party Advisory
- https://www.openwall.com/lists/oss-security/2018/10/02/2Mailing List, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.