UBUNTU-CVE-2021-33909
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
1 explicit affected versions
6 explicit affected versions
2 explicit affected versions
67 explicit affected versions
28 explicit affected versions
47 explicit affected versions
20 explicit affected versions
77 explicit affected versions
2 explicit affected versions
23 explicit affected versions
64 explicit affected versions
1 explicit affected versions
1 explicit affected versions
20 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
1 explicit affected versions
1 explicit affected versions
30 explicit affected versions
38 explicit affected versions
1 explicit affected versions
30 explicit affected versions
22 explicit affected versions
10 explicit affected versions
129 explicit affected versions
15 explicit affected versions
63 explicit affected versions
44 explicit affected versions
1 explicit affected versions
16 explicit affected versions
1 explicit affected versions
29 explicit affected versions
13 explicit affected versions
20 explicit affected versions
61 explicit affected versions
1 explicit affected versions
33 explicit affected versions
33 explicit affected versions
10 explicit affected versions
46 explicit affected versions
11 explicit affected versions
1 explicit affected versions
69 explicit affected versions
2 explicit affected versions
31 explicit affected versions
2 explicit affected versions
64 explicit affected versions
26 explicit affected versions
161 explicit affected versions
1 explicit affected versions
10 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
26 explicit affected versions
3 explicit affected versions
20 explicit affected versions
1 explicit affected versions
21 explicit affected versions
1 explicit affected versions
1 explicit affected versions
23 explicit affected versions
10 explicit affected versions
19 explicit affected versions
44 explicit affected versions
16 explicit affected versions
15 explicit affected versions
19 explicit affected versions
38 explicit affected versions
9 explicit affected versions
107 explicit affected versions
21 explicit affected versions
42 explicit affected versions
4 explicit affected versions
77 explicit affected versions
54 explicit affected versions
2 explicit affected versions
13 explicit affected versions
45 explicit affected versions
20 explicit affected versions
42 explicit affected versions
1 explicit affected versions
85 explicit affected versions
92 explicit affected versions
12 explicit affected versions
23 explicit affected versions
4 explicit affected versions
10 explicit affected versions
1 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b
- https://ubuntu.com/security/CVE-2021-33909
- https://ubuntu.com/security/notices/USN-5014-1
- https://ubuntu.com/security/notices/USN-5015-1
- https://ubuntu.com/security/notices/USN-5016-1
- https://ubuntu.com/security/notices/USN-5017-1
- https://ubuntu.com/security/notices/USN-5018-1
- https://www.cve.org/CVERecord?id=CVE-2021-33909
- https://www.openwall.com/lists/oss-security/2021/07/20/1
- https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt