UBUNTU-CVE-2019-14284
In the Linux kernel before 5.2.3, drivers/block/floppy.c allows a denial of service by setup_format_params division-by-zero. Two consecutive ioctls can trigger the bug: the first one should set the drive geometry with .sect and .rate values that make F_SECT_PER_TRACK be zero. Next, the floppy format operation should be called. It can be triggered by an unprivileged local user even when a floppy disk has not been inserted. NOTE: QEMU creates the floppy device by default.
02 / AFFECTED SOFTWARE
Affected packages
34 explicit affected versions
1 explicit affected versions
1 explicit affected versions
12 explicit affected versions
1 explicit affected versions
34 explicit affected versions
2 explicit affected versions
10 explicit affected versions
11 explicit affected versions
34 explicit affected versions
10 explicit affected versions
28 explicit affected versions
1 explicit affected versions
7 explicit affected versions
23 explicit affected versions
11 explicit affected versions
68 explicit affected versions
2 explicit affected versions
30 explicit affected versions
35 explicit affected versions
96 explicit affected versions
51 explicit affected versions
42 explicit affected versions
66 explicit affected versions
24 explicit affected versions
4 explicit affected versions
191 explicit affected versions
29 explicit affected versions
11 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
27 explicit affected versions
75 explicit affected versions
55 explicit affected versions
10 explicit affected versions
21 explicit affected versions
55 explicit affected versions
12 explicit affected versions
32 explicit affected versions
26 explicit affected versions
13 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel before 5.2.3, drivers/block/floppy.c allows a denial of service by setup_format_params division-by-zero. Two consecutive ioctls can trigger the bug: the first one should set the drive geometry with .sect and .rate values that make F_SECT_PER_TRACK be zero. Next, the floppy format operation should be called. It can be triggered by an unprivileged local user even when a floppy disk has not been inserted. NOTE: QEMU creates the floppy device by default.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/f3554aeb991214cbfafd17d55e2bfddb50282e32
- https://ubuntu.com/security/CVE-2019-14284
- https://ubuntu.com/security/notices/USN-4114-1
- https://ubuntu.com/security/notices/USN-4115-1
- https://ubuntu.com/security/notices/USN-4116-1
- https://ubuntu.com/security/notices/USN-4117-1
- https://ubuntu.com/security/notices/USN-4118-1
- https://www.cve.org/CVERecord?id=CVE-2019-14284