CVE-2021-20261
Published: 11 March 2021
A race condition was found in the Linux kernels implementation of the floppy disk drive controller driver software. The impact of this issue is lessened by the fact that the default permissions on the floppy device (/dev/fd0) are restricted to root. If the permissions on the device have changed the impact changes greatly. In the default configuration root (or equivalent) permissions are required to attack this flaw.
From the Ubuntu Security Team
It was discovered that a race condition existed in the floppy device driver in the Linux kernel. An attacker with access to the floppy device could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
linux
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.13.0-16.19)
|
| focal |
Not vulnerable
(5.4.0-9.12)
|
|
| groovy |
Not vulnerable
(5.4.0-26.30)
|
|
| trusty |
Ignored
(was needs-triage ESM criteria)
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Released
(4.4.0-207.239)
|
|
|
Patches:
Introduced by
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
|
||
|
linux-aws
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1001.1)
|
| focal |
Not vulnerable
(5.4.0-1005.5)
|
|
| groovy |
Not vulnerable
(5.4.0-1009.9)
|
|
| trusty |
Released
(4.4.0-1090.94)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Released
(4.4.0-1126.140)
|
|
|
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(superseded by linux-aws-5.3)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
(4.5~rc5)
|
|
| 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(superseded by linux-aws-5.4)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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-aws-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1018.18~18.04.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| 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
(4.5~rc5)
|
|
| xenial |
Not vulnerable
(4.15.0-1030.31~16.04.1)
|
|
|
linux-azure
Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-azure-5.3)
|
| focal |
Not vulnerable
(5.4.0-1006.6)
|
|
| groovy |
Not vulnerable
(5.4.0-1010.10)
|
|
| trusty |
Ignored
(was needs-triage ESM criteria)
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Not vulnerable
(4.11.0-1009.9)
|
|
|
linux-azure-4.15
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1082.92)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| 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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-azure-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1020.20~18.04.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| 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
(4.5~rc5)
|
|
| 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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gcp
Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-gcp-5.3)
|
| focal |
Not vulnerable
(5.4.0-1005.5)
|
|
| groovy |
Not vulnerable
(5.4.0-1009.9)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Not vulnerable
(4.10.0-1004.4)
|
|
|
linux-gcp-4.15
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1071.81)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gcp-5.3
Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-gcp-5.4)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gcp-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1019.19~18.04.2)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| 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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gke-4.15
Launchpad, Ubuntu, Debian |
bionic |
Ignored
(end of life, was needs-triage)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gke-5.0
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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gke-5.3
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.3.0-1011.12~18.04.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gke-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1025.25~18.04.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-gkeop-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1001.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
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
(4.5~rc5)
|
|
| xenial |
Not vulnerable
(4.8.0-36.36~16.04.1)
|
|
|
linux-hwe-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-37.41~18.04.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| 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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-hwe-edge
Launchpad, Ubuntu, Debian |
bionic |
Ignored
(superseded by linux-hwe-5.4)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Ignored
(superseded by linux-hwe)
|
|
|
linux-kvm
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1002.2)
|
| focal |
Not vulnerable
(5.4.0-1004.4)
|
|
| groovy |
Not vulnerable
(5.4.0-1009.9)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Released
(4.4.0-1091.100)
|
|
|
linux-lts-trusty
Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-lts-xenial
Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Released
(4.4.0-208.240~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-oem
Launchpad, Ubuntu, Debian |
bionic |
Ignored
(end of life, was needs-triage)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| 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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-oem-5.6
Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Not vulnerable
(5.6.0-1007.7)
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-oracle
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.15.0-1007.9)
|
| focal |
Not vulnerable
(5.4.0-1005.5)
|
|
| groovy |
Not vulnerable
(5.4.0-1009.9)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Not vulnerable
(4.15.0-1007.9~16.04.1)
|
|
|
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
(4.5~rc5)
|
|
| 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
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-oracle-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1019.19~18.04.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-raspi
Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Not vulnerable
(5.4.0-1007.7)
|
|
| groovy |
Not vulnerable
(5.4.0-1008.8)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-raspi-5.4
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.4.0-1013.13~18.04.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-raspi2
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(4.13.0-1005.5)
|
| focal |
Ignored
(replaced by linux-raspi)
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Released
(4.4.0-1150.161)
|
|
|
linux-raspi2-5.3
Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(5.3.0-1017.19~18.04.1)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-riscv
Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Ignored
(end of life, was needs-triage)
|
|
| groovy |
Not vulnerable
(5.4.0-24.28)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Does not exist
|
|
|
linux-snapdragon
Launchpad, Ubuntu, Debian |
bionic |
Released
(4.15.0-1053.57)
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.5~rc5)
|
|
| xenial |
Released
(4.4.0-1154.164)
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.4 |
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | High |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
References
- https://git.kernel.org/linus/a0c80efe5956ccce9fe7ae5c78542578c07bc20a
- https://bugzilla.redhat.com/show_bug.cgi?id=1932150
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a0c80efe5956ccce9fe7ae5c78542578c07bc20a
- https://ubuntu.com/security/notices/USN-4904-1
- https://www.cve.org/CVERecord?id=CVE-2021-20261
- NVD
- Launchpad
- Debian