CVE-2019-19581
Published: 11 December 2019
An issue was discovered in Xen through 4.12.x allowing 32-bit Arm guest OS users to cause a denial of service (out-of-bounds access) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On 32-bit Arm accesses to bitmaps with bit a count which is a multiple of 32, an out of bounds access may occur. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. 32-bit Arm systems are vulnerable. 64-bit Arm systems are not vulnerable.
Notes
| Author | Note |
|---|---|
| mdeslaur | hypervisor packages are in universe. For issues in the hypervisor, add appropriate tags to each section, ex: Tags_xen: universe-binary |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
xen Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| disco |
Ignored
(end of life)
|
|
| eoan |
Ignored
(end of life)
|
|
| focal |
Not vulnerable
(4.11.3+24-g14b62ab3e5-1ubuntu1)
|
|
| groovy |
Not vulnerable
(4.11.3+24-g14b62ab3e5-1ubuntu1)
|
|
| hirsute |
Not vulnerable
(4.11.3+24-g14b62ab3e5-1ubuntu1)
|
|
| impish |
Not vulnerable
(4.11.3+24-g14b62ab3e5-1ubuntu1)
|
|
| jammy |
Not vulnerable
(4.11.3+24-g14b62ab3e5-1ubuntu1)
|
|
| kinetic |
Not vulnerable
(4.11.3+24-g14b62ab3e5-1ubuntu1)
|
|
| lunar |
Not vulnerable
(4.11.3+24-g14b62ab3e5-1ubuntu1)
|
|
| mantic |
Not vulnerable
(4.11.3+24-g14b62ab3e5-1ubuntu1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Needed
|
|
| Binaries built from this source package are in Universe and so are supported by the community. | ||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Changed |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |