UBUNTU-CVE-2020-10711
A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.
02 / AFFECTED SOFTWARE
Affected packages
5 explicit affected versions
69 explicit affected versions
27 explicit affected versions
44 explicit affected versions
13 explicit affected versions
26 explicit affected versions
8 explicit affected versions
11 explicit affected versions
82 explicit affected versions
10 explicit affected versions
2 explicit affected versions
45 explicit affected versions
2 explicit affected versions
49 explicit affected versions
111 explicit affected versions
51 explicit affected versions
3 explicit affected versions
58 explicit affected versions
1 explicit affected versions
80 explicit affected versions
40 explicit affected versions
6 explicit affected versions
22 explicit affected versions
6 explicit affected versions
191 explicit affected versions
45 explicit affected versions
10 explicit affected versions
26 explicit affected versions
1 explicit affected versions
51 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
7 explicit affected versions
3 explicit affected versions
1 explicit affected versions
10 explicit affected versions
14 explicit affected versions
48 explicit affected versions
17 explicit affected versions
10 explicit affected versions
2 explicit affected versions
10 explicit affected versions
25 explicit affected versions
47 explicit affected versions
24 explicit affected versions
3 explicit affected versions
11 explicit affected versions
8 explicit affected versions
42 explicit affected versions
1 explicit affected versions
11 explicit affected versions
21 explicit affected versions
23 explicit affected versions
3 explicit affected versions
3 explicit affected versions
38 explicit affected versions
7 explicit affected versions
89 explicit affected versions
71 explicit affected versions
24 explicit affected versions
35 explicit affected versions
30 explicit affected versions
12 explicit affected versions
4 explicit affected versions
4 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.
05 / REFERENCES
Further evidence
- https://lore.kernel.org/netdev/07d99ae197bfdb2964931201db67b6cd0b38db5b.1589276729.git.pabeni@redhat.com/T/#u
- https://ubuntu.com/security/CVE-2020-10711
- https://ubuntu.com/security/notices/USN-4411-1
- https://ubuntu.com/security/notices/USN-4412-1
- https://ubuntu.com/security/notices/USN-4413-1
- https://ubuntu.com/security/notices/USN-4414-1
- https://ubuntu.com/security/notices/USN-4419-1
- https://www.cve.org/CVERecord?id=CVE-2020-10711
- https://www.openwall.com/lists/oss-security/2020/05/12/2