CVE-2020-12768
Publication date 9 May 2020
Last updated 24 July 2024
Ubuntu priority
** DISPUTED ** An issue was discovered in the Linux kernel before 5.6. svm_cpu_uninit in arch/x86/kvm/svm.c has a memory leak, aka CID-d80b64ff297e. NOTE: third parties dispute this issue because it's a one-time leak at the boot, the size is negligible, and it can't be triggered at will.
From the Ubuntu Security Team
It was discovered that the KVM implementation in the Linux kernel did not properly deallocate memory on initialization for some processors. A local attacker could possibly use this to cause a denial of service.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| linux | 20.04 LTS focal |
Fixed 5.4.0-40.44
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Ignored | |
| linux-aws | 20.04 LTS focal |
Fixed 5.4.0-1018.18
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Ignored | |
| linux-aws-5.0 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-aws-5.3 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.3.0-1030.32~18.04.1
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-aws-5.4 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-aws-hwe | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Not in release | |
| linux-azure | 20.04 LTS focal |
Fixed 5.4.0-1020.20
|
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Ignored | |
| linux-azure-4.15 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-azure-5.3 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.3.0-1032.33~18.04.1
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-azure-5.4 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-azure-edge | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-gcp | 20.04 LTS focal |
Fixed 5.4.0-1019.19
|
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Not in release | |
| linux-gcp-4.15 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-gcp-5.3 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.3.0-1030.32~18.04.1
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-gcp-5.4 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-gcp-edge | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-gke-4.15 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-gke-5.0 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.0.0-1043.44
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-gke-5.3 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.3.0-1030.32~18.04.1
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-hwe | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.3.0-62.56~18.04.1
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Not in release | |
| linux-hwe-5.4 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.4.0-40.44~18.04.1
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-hwe-edge | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Ignored | |
| 14.04 LTS trusty | Not in release | |
| linux-kvm | 20.04 LTS focal |
Fixed 5.4.0-1018.18
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Not in release | |
| linux-lts-trusty | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-lts-xenial | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Ignored | |
| linux-oem | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Ignored | |
| 14.04 LTS trusty | Not in release | |
| linux-oem-5.6 | 20.04 LTS focal |
Not affected
|
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-oem-osp1 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.0.0-1063.68
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-oracle | 20.04 LTS focal |
Fixed 5.4.0-1019.19
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Not in release | |
| linux-oracle-5.0 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-oracle-5.3 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.3.0-1028.30~18.04.1
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-oracle-5.4 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-raspi | 20.04 LTS focal |
Fixed 5.4.0-1013.13
|
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-raspi-5.4 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-raspi2 | 20.04 LTS focal | Ignored |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Not in release | |
| linux-raspi2-5.3 | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Fixed 5.3.0-1028.30~18.04.2
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-riscv | 20.04 LTS focal |
Fixed 5.4.0-28.32
|
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-snapdragon | 20.04 LTS focal | Not in release |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Not in release |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.5 · Medium
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-4411-1
- Linux kernel vulnerabilities
- 6 July 2020
- USN-4412-1
- Linux kernel vulnerabilities
- 6 July 2020
- USN-4413-1
- Linux kernel vulnerabilities
- 2 July 2020
Other references
- https://git.kernel.org/linus/d80b64ff297e40c2b6f7d7abc1b3eba70d22a068 (5.6-rc4)
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d80b64ff297e40c2b6f7d7abc1b3eba70d22a068
- https://www.cve.org/CVERecord?id=CVE-2020-12768