Vulnerability Details : CVE-2021-36086
The CIL compiler in SELinux 3.2 has a use-after-free in cil_reset_classpermission (called from cil_reset_classperms_set and cil_reset_classperms_list).
Vulnerability category: Memory Corruption
Products affected by CVE-2021-36086
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:o:selinux_project:selinux:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-36086
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 28 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-36086
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
|
3.3
|
LOW | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
1.8
|
1.4
|
NIST |
CWE ids for CVE-2021-36086
-
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-36086
-
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32177
32177 - selinux:secilc-fuzzer: Heap-use-after-free in cil_reset_classpermission - oss-fuzzExploit;Issue Tracking;Patch;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR/
[SECURITY] Fedora 35 Update: libsepol-3.3-2.fc35 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/SELinuxProject/selinux/commit/c49a8ea09501ad66e799ea41b8154b6770fec2c8
libsepol/cil: cil_reset_classperms_set() should not reset classpermis… · SELinuxProject/selinux@c49a8ea · GitHubPatch;Third Party Advisory
-
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-536.yaml
oss-fuzz-vulns/OSV-2021-536.yaml at main · google/oss-fuzz-vulns · GitHubThird Party Advisory
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