UBUNTU-CVE-2020-8428
fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.
02 / AFFECTED SOFTWARE
Affected packages
76 explicit affected versions
35 explicit affected versions
6 explicit affected versions
17 explicit affected versions
6 explicit affected versions
40 explicit affected versions
21 explicit affected versions
46 explicit affected versions
23 explicit affected versions
1 explicit affected versions
6 explicit affected versions
1 explicit affected versions
44 explicit affected versions
13 explicit affected versions
10 explicit affected versions
21 explicit affected versions
43 explicit affected versions
20 explicit affected versions
6 explicit affected versions
4 explicit affected versions
38 explicit affected versions
17 explicit affected versions
23 explicit affected versions
11 explicit affected versions
78 explicit affected versions
2 explicit affected versions
41 explicit affected versions
45 explicit affected versions
107 explicit affected versions
51 explicit affected versions
54 explicit affected versions
65 explicit affected versions
23 explicit affected versions
43 explicit affected versions
8 explicit affected versions
26 explicit affected versions
4 explicit affected versions
37 explicit affected versions
2 explicit affected versions
85 explicit affected versions
67 explicit affected versions
20 explicit affected versions
31 explicit affected versions
25 explicit affected versions
12 explicit affected versions
4 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.
05 / REFERENCES
Further evidence
- https://syzkaller.appspot.com/bug?extid=190005201ced78a74ad6
- https://ubuntu.com/security/CVE-2020-8428
- https://ubuntu.com/security/notices/USN-4318-1
- https://ubuntu.com/security/notices/USN-4319-1
- https://ubuntu.com/security/notices/USN-4320-1
- https://ubuntu.com/security/notices/USN-4324-1
- https://ubuntu.com/security/notices/USN-4325-1
- https://usn.ubuntu.com/lsn/0065-1/
- https://www.cve.org/CVERecord?id=CVE-2020-8428
- https://www.openwall.com/lists/oss-security/2020/01/28/2
- https://www.openwall.com/lists/oss-security/2020/02/02/1