CVE-2020-29368
Published: 28 November 2020
An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.
From the Ubuntu Security Team
Jann Horn discovered a race condition in the copy-on-write implementation in the Linux kernel when handling hugepages. A local attacker could use this to gain unintended write access to read-only memory pages.
Priority
Status
Package | Release | Status |
---|---|---|
linux Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-115.116)
|
groovy |
Not vulnerable
(5.8.0-16.17)
|
|
trusty |
Ignored
(was needs-triage ESM criteria)
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Not vulnerable
(4.2.0-16.19)
|
|
focal |
Released
(5.4.0-45.49)
|
|
Patches: Introduced by 6d0a07edd17cfc12fdc1f36de8072fa17cc3666f |
||
linux-aws Launchpad, Ubuntu, Debian |
groovy |
Not vulnerable
(5.8.0-1004.4)
|
trusty |
Ignored
(was needs-triage ESM criteria)
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Not vulnerable
(4.4.0-1001.10)
|
|
bionic |
Released
(4.15.0-1080.84)
|
|
focal |
Released
(5.4.0-1022.22)
|
|
linux-aws-5.0 Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-aws-5.3)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-aws-5.3 Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-aws-5.4)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-aws-5.4 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.4.0-1022.22~18.04.1)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-aws-hwe Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Released
(4.15.0-1080.84~16.04.1)
|
|
linux-azure Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-azure-5.3)
|
focal |
Released
(5.4.0-1023.23)
|
|
groovy |
Not vulnerable
(5.8.0-1004.4)
|
|
trusty |
Ignored
(was needs-triage ESM criteria)
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Released
(4.15.0-1093.103~16.04.1)
|
|
linux-azure-4.15 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1093.103)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-azure-5.3 Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-azure-5.4)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-azure-5.4 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.4.0-1023.23~18.04.1)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-azure-edge Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-azure-5.3)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-dell300x Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1005.8)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-gcp Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-gcp-5.3)
|
focal |
Released
(5.4.0-1022.22)
|
|
groovy |
Not vulnerable
(5.8.0-1002.2)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Released
(4.15.0-1081.92~16.04.1)
|
|
linux-gcp-4.15 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1081.92)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-gcp-5.3 Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-gcp-5.4)
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
focal |
Does not exist
|
|
linux-gcp-5.4 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.4.0-1022.22~18.04.1)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-gcp-edge Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-gcp-5.3)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-gke-4.15 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1067.70)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-gke-5.0 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.0.0-1045.46)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-gke-5.3 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.3.0-1032.34~18.04.1)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-gke-5.4 Launchpad, Ubuntu, Debian |
groovy |
Does not exist
|
trusty |
Does not exist
|
|
xenial |
Does not exist
|
|
focal |
Does not exist
|
|
bionic |
Not vulnerable
(5.4.0-1025.25~18.04.1)
|
|
upstream |
Released
(5.8~rc1)
|
|
linux-gkeop Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Not vulnerable
(5.4.0-1008.9)
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-gkeop-5.4 Launchpad, Ubuntu, Debian |
focal |
Does not exist
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
xenial |
Does not exist
|
|
bionic |
Not vulnerable
(5.4.0-1001.1)
|
|
upstream |
Released
(5.8~rc1)
|
|
linux-hwe Launchpad, Ubuntu, Debian |
bionic |
Ignored
(replaced by linux-hwe-5.4)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Released
(4.15.0-115.116~16.04.1)
|
|
linux-hwe-5.4 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.4.0-45.49~18.04.2)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-hwe-5.8 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Not vulnerable
(5.8.0-23.24~20.04.1)
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-hwe-edge Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-hwe-5.4)
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Ignored
(superseded by linux-hwe)
|
|
focal |
Does not exist
|
|
linux-kvm Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1072.73)
|
focal |
Released
(5.4.0-1021.21)
|
|
groovy |
Not vulnerable
(5.8.0-1001.1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Not vulnerable
(4.4.0-1004.9)
|
|
linux-lts-trusty Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-lts-xenial Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Ignored
(was needs-triage ESM criteria)
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-oem Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1094.104)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Ignored
(end of standard support)
|
|
linux-oem-5.10 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Not vulnerable
(5.10.0-1008.9)
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-oem-5.6 Launchpad, Ubuntu, Debian |
focal |
Released
(5.6.0-1048.52)
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
bionic |
Does not exist
|
|
linux-oem-osp1 Launchpad, Ubuntu, Debian |
bionic |
Ignored
(end of standard support, was needs-triage)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-oracle Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1051.55)
|
focal |
Released
(5.4.0-1022.22)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Released
(4.15.0-1051.55~16.04.1)
|
|
groovy |
Not vulnerable
(5.8.0-1001.1)
|
|
linux-oracle-5.0 Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-oracle-5.3)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-oracle-5.3 Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-oracle-5.4)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-oracle-5.4 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.4.0-1022.22~18.04.1)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-raspi Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Released
(5.4.0-1016.17)
|
|
groovy |
Not vulnerable
(5.4.0-1016.17)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-raspi-5.4 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.4.0-1016.17~18.04.1)
|
groovy |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
focal |
Does not exist
|
|
trusty |
Does not exist
|
|
xenial |
Does not exist
|
|
linux-raspi2 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1068.72)
|
focal |
Ignored
(replaced by linux-raspi)
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Not vulnerable
(4.2.0-1013.19)
|
|
linux-raspi2-5.3 Launchpad, Ubuntu, Debian |
bionic |
Released
(5.3.0-1030.32~18.04.2)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-riscv Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Released
(5.4.0-31.35)
|
|
groovy |
Not vulnerable
(5.8.0-1.1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Does not exist
|
|
linux-snapdragon Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1084.92)
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.8~rc1)
|
|
xenial |
Not vulnerable
(4.4.0-1013.15)
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.0 |
Attack vector | Local |
Attack complexity | High |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | High |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29368
- https://git.kernel.org/linus/c444eb564fb16645c172d550359cb3d75fe8a040
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2045
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040
- https://ubuntu.com/security/notices/USN-4752-1
- NVD
- Launchpad
- Debian