UBUNTU-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.
02 / AFFECTED SOFTWARE
Affected packages
69 explicit affected versions
26 explicit affected versions
7 explicit affected versions
191 explicit affected versions
33 explicit affected versions
15 explicit affected versions
1 explicit affected versions
38 explicit affected versions
1 explicit affected versions
1 explicit affected versions
12 explicit affected versions
1 explicit affected versions
37 explicit affected versions
6 explicit affected versions
10 explicit affected versions
15 explicit affected versions
36 explicit affected versions
13 explicit affected versions
32 explicit affected versions
1 explicit affected versions
11 explicit affected versions
23 explicit affected versions
11 explicit affected versions
71 explicit affected versions
2 explicit affected versions
34 explicit affected versions
39 explicit affected versions
99 explicit affected versions
51 explicit affected versions
46 explicit affected versions
1 explicit affected versions
1 explicit affected versions
58 explicit affected versions
16 explicit affected versions
35 explicit affected versions
26 explicit affected versions
30 explicit affected versions
77 explicit affected versions
59 explicit affected versions
13 explicit affected versions
23 explicit affected versions
16 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://ubuntu.com/security/CVE-2019-14821
- https://ubuntu.com/security/notices/USN-4157-1
- https://ubuntu.com/security/notices/USN-4157-2
- https://ubuntu.com/security/notices/USN-4162-1
- https://ubuntu.com/security/notices/USN-4162-2
- https://ubuntu.com/security/notices/USN-4163-1
- https://ubuntu.com/security/notices/USN-4163-2
- https://www.cve.org/CVERecord?id=CVE-2019-14821
- https://www.openwall.com/lists/oss-security/2019/09/20/1