CVE-2021-20261

EUVD-2021-7698
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.
Race Condition
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.4 MEDIUM
LOCAL
HIGH
HIGH
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 9%
Affected Products (NVD)
VendorProductVersion
linuxlinux_kernel
𝑥
< 4.5
linuxlinux_kernel
4.5
linuxlinux_kernel
4.5:rc1
linuxlinux_kernel
4.5:rc2
linuxlinux_kernel
4.5:rc3
linuxlinux_kernel
4.5:rc4
redhatenterprise_linux
7.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
linux
bookworm
6.1.106-3
fixed
bookworm (security)
6.1.112-1
fixed
bullseye
5.10.223-1
fixed
bullseye (security)
5.10.226-1
fixed
sid
6.11.5-1
fixed
trixie
6.11.5-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
linux
bionic
not-affected
focal
not-affected
groovy
not-affected
trusty
ignored
xenial
Fixed 4.4.0-207.239
released
linux-aws
bionic
not-affected
focal
not-affected
groovy
not-affected
trusty
Fixed 4.4.0-1090.94
released
xenial
Fixed 4.4.0-1126.140
released
linux-aws-5.0
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-aws-5.3
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-aws-5.4
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-aws-hwe
bionic
dne
focal
dne
groovy
dne
trusty
dne
xenial
not-affected
linux-azure
bionic
ignored
focal
not-affected
groovy
not-affected
trusty
ignored
xenial
not-affected
linux-azure-4.15
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-azure-5.3
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-azure-5.4
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-azure-edge
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-dell300x
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gcp
bionic
ignored
focal
not-affected
groovy
not-affected
trusty
dne
xenial
not-affected
linux-gcp-4.15
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gcp-5.3
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gcp-5.4
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gcp-edge
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gke-4.15
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gke-5.0
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gke-5.3
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gke-5.4
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-gkeop
bionic
dne
focal
not-affected
groovy
dne
trusty
dne
xenial
dne
linux-gkeop-5.4
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-hwe
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
not-affected
linux-hwe-5.4
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-hwe-5.8
bionic
dne
focal
not-affected
groovy
dne
trusty
dne
xenial
dne
linux-hwe-edge
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
ignored
linux-kvm
bionic
not-affected
focal
not-affected
groovy
not-affected
trusty
dne
xenial
Fixed 4.4.0-1091.100
released
linux-lts-trusty
bionic
dne
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-lts-xenial
bionic
dne
focal
dne
groovy
dne
trusty
Fixed 4.4.0-208.240~14.04.1
released
xenial
dne
linux-oem
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
ignored
linux-oem-5.10
bionic
dne
focal
not-affected
groovy
dne
trusty
dne
xenial
dne
linux-oem-5.6
bionic
dne
focal
not-affected
groovy
dne
trusty
dne
xenial
dne
linux-oem-osp1
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-oracle
bionic
not-affected
focal
not-affected
groovy
not-affected
trusty
dne
xenial
not-affected
linux-oracle-5.0
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-oracle-5.3
bionic
ignored
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-oracle-5.4
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-raspi
bionic
dne
focal
not-affected
groovy
not-affected
trusty
dne
xenial
dne
linux-raspi-5.4
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-raspi2
bionic
not-affected
focal
ignored
groovy
dne
trusty
dne
xenial
Fixed 4.4.0-1150.161
released
linux-raspi2-5.3
bionic
not-affected
focal
dne
groovy
dne
trusty
dne
xenial
dne
linux-riscv
bionic
dne
focal
ignored
groovy
not-affected
trusty
dne
xenial
dne
linux-snapdragon
bionic
Fixed 4.15.0-1053.57
released
focal
dne
groovy
dne
trusty
dne
xenial
Fixed 4.4.0-1154.164
released
Common Weakness Enumeration
References
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://bugzilla.redhat.com/show_bug.cgi?id=1932150
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a0c80efe5956ccce9fe7ae5c78542578c07bc20a