UBUNTU-CVE-2021-4002
A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
8 explicit affected versions
6 explicit affected versions
9 explicit affected versions
74 explicit affected versions
35 explicit affected versions
54 explicit affected versions
27 explicit affected versions
6 explicit affected versions
86 explicit affected versions
4 explicit affected versions
23 explicit affected versions
68 explicit affected versions
1 explicit affected versions
1 explicit affected versions
21 explicit affected versions
2 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
8 explicit affected versions
1 explicit affected versions
7 explicit affected versions
9 explicit affected versions
38 explicit affected versions
46 explicit affected versions
8 explicit affected versions
38 explicit affected versions
29 explicit affected versions
10 explicit affected versions
134 explicit affected versions
22 explicit affected versions
67 explicit affected versions
52 explicit affected versions
1 explicit affected versions
23 explicit affected versions
1 explicit affected versions
29 explicit affected versions
13 explicit affected versions
68 explicit affected versions
1 explicit affected versions
40 explicit affected versions
33 explicit affected versions
10 explicit affected versions
53 explicit affected versions
11 explicit affected versions
10 explicit affected versions
76 explicit affected versions
7 explicit affected versions
38 explicit affected versions
2 explicit affected versions
72 explicit affected versions
34 explicit affected versions
164 explicit affected versions
1 explicit affected versions
6 explicit affected versions
17 explicit affected versions
30 explicit affected versions
1 explicit affected versions
1 explicit affected versions
34 explicit affected versions
5 explicit affected versions
28 explicit affected versions
1 explicit affected versions
28 explicit affected versions
9 explicit affected versions
1 explicit affected versions
30 explicit affected versions
10 explicit affected versions
26 explicit affected versions
44 explicit affected versions
16 explicit affected versions
7 explicit affected versions
22 explicit affected versions
38 explicit affected versions
9 explicit affected versions
111 explicit affected versions
28 explicit affected versions
46 explicit affected versions
9 explicit affected versions
84 explicit affected versions
61 explicit affected versions
4 explicit affected versions
18 explicit affected versions
52 explicit affected versions
28 explicit affected versions
43 explicit affected versions
1 explicit affected versions
89 explicit affected versions
101 explicit affected versions
30 explicit affected versions
4 explicit affected versions
17 explicit affected versions
1 explicit affected versions
8 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/a4a118f2eead1d6c49e00765de89878288d4b890
- https://ubuntu.com/security/CVE-2021-4002
- https://ubuntu.com/security/notices/USN-5206-1
- https://ubuntu.com/security/notices/USN-5207-1
- https://ubuntu.com/security/notices/USN-5208-1
- https://ubuntu.com/security/notices/USN-5209-1
- https://ubuntu.com/security/notices/USN-5210-1
- https://ubuntu.com/security/notices/USN-5211-1
- https://ubuntu.com/security/notices/USN-5218-1
- https://www.cve.org/CVERecord?id=CVE-2021-4002
- https://www.openwall.com/lists/oss-security/2021/11/25/1