Buffer overflow in Linux Kernel
CVE-2019-14821
An out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvm_coalesced_mmio' object, wherein write indices 'ring->first' and 'ring->last' value could be supplied by a host user-space process. An unprivileged host user or process with access to '/dev/kvm' device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Mitigation, Issue Tracking)
- www.openwall.com/lists/oss-security/2019/09/20/1 (mailing-list, Patch, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/09/msg00025.html (mailing-list, Mailing List, Third Party Advisory)
- seclists.org/bugtraq/2019/Sep/41 (mailing-list, Mailing List, Third Party Advisory, Issue Tracking)
- www.debian.org/security/2019/dsa-4531 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/10/msg00000.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20191004-0001/ (Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00037.html (vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-14821?
- CVE-2019-14821 is a high-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2019-09-19.
- How severe is CVE-2019-14821?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2019-14821 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.