UBUNTU-CVE-2021-20261
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.
02 / AFFECTED SOFTWARE
Affected packages
23 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
92 explicit affected versions
50 explicit affected versions
6 explicit affected versions
6 explicit affected versions
57 explicit affected versions
191 explicit affected versions
1 explicit affected versions
60 explicit affected versions
59 explicit affected versions
4 explicit affected versions
13 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
11 explicit affected versions
94 explicit affected versions
2 explicit affected versions
125 explicit affected versions
51 explicit affected versions
81 explicit affected versions
44 explicit affected versions
16 explicit affected versions
26 explicit affected versions
38 explicit affected versions
9 explicit affected versions
103 explicit affected versions
38 explicit affected versions
43 explicit affected versions
12 explicit affected versions
4 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://bugzilla.redhat.com/show_bug.cgi?id=1932150
- https://git.kernel.org/linus/a0c80efe5956ccce9fe7ae5c78542578c07bc20a
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a0c80efe5956ccce9fe7ae5c78542578c07bc20a
- https://ubuntu.com/security/CVE-2021-20261
- https://ubuntu.com/security/notices/USN-4904-1
- https://www.cve.org/CVERecord?id=CVE-2021-20261