UBUNTU-CVE-2022-0185
A heap-based buffer overflow flaw was found in the way the legacy_parse_param function in the Filesystem Context functionality of the Linux kernel verified the supplied parameters length. An unprivileged (in case of unprivileged user namespaces enabled, otherwise needs namespaced CAP_SYS_ADMIN privilege) local user able to open a filesystem that does not support the Filesystem Context API (and thus fallbacks to legacy handling) could use this flaw to escalate their privileges on the system.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
10 explicit affected versions
6 explicit affected versions
10 explicit affected versions
36 explicit affected versions
8 explicit affected versions
1 explicit affected versions
4 explicit affected versions
23 explicit affected versions
1 explicit affected versions
21 explicit affected versions
4 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
10 explicit affected versions
1 explicit affected versions
3 explicit affected versions
10 explicit affected versions
40 explicit affected versions
1 explicit affected versions
48 explicit affected versions
10 explicit affected versions
39 explicit affected versions
10 explicit affected versions
23 explicit affected versions
1 explicit affected versions
25 explicit affected versions
1 explicit affected versions
29 explicit affected versions
13 explicit affected versions
41 explicit affected versions
33 explicit affected versions
10 explicit affected versions
11 explicit affected versions
12 explicit affected versions
7 explicit affected versions
39 explicit affected versions
36 explicit affected versions
1 explicit affected versions
7 explicit affected versions
18 explicit affected versions
1 explicit affected versions
1 explicit affected versions
5 explicit affected versions
30 explicit affected versions
1 explicit affected versions
29 explicit affected versions
11 explicit affected versions
1 explicit affected versions
10 explicit affected versions
1 explicit affected versions
27 explicit affected versions
44 explicit affected versions
16 explicit affected versions
9 explicit affected versions
23 explicit affected versions
38 explicit affected versions
9 explicit affected versions
29 explicit affected versions
10 explicit affected versions
4 explicit affected versions
29 explicit affected versions
43 explicit affected versions
1 explicit affected versions
31 explicit affected versions
4 explicit affected versions
18 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
A heap-based buffer overflow flaw was found in the way the legacy_parse_param function in the Filesystem Context functionality of the Linux kernel verified the supplied parameters length. An unprivileged (in case of unprivileged user namespaces enabled, otherwise needs namespaced CAP_SYS_ADMIN privilege) local user able to open a filesystem that does not support the Filesystem Context API (and thus fallbacks to legacy handling) could use this flaw to escalate their privileges on the system.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=722d94847de29310e8aa03fcbdb41fc92c521756
- https://ubuntu.com/security/CVE-2022-0185
- https://ubuntu.com/security/notices/USN-5240-1
- https://ubuntu.com/security/notices/USN-5362-1
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- https://www.cve.org/CVERecord?id=CVE-2022-0185
- https://www.openwall.com/lists/oss-security/2022/01/18/7