Vulnerability Details : CVE-2021-33033
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
Vulnerability category: Memory Corruption
Exploit prediction scoring system (EPSS) score for CVE-2021-33033
Probability of exploitation activity in the next 30 days: 0.08%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 35 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-33033
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
[email protected] |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
[email protected] |
CWE ids for CVE-2021-33033
-
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.Assigned by: [email protected] (Primary)
References for CVE-2021-33033
-
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08
Mailing List;Patch;Vendor Advisory
-
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8
Mailing List;Patch;Vendor Advisory
-
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7
Mailing List;Patch;Vendor Advisory
-
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt
Exploit;Third Party Advisory
-
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14
Mailing List;Patch;Vendor Advisory
-
https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e
Exploit;Mailing List;Third Party Advisory
Products affected by CVE-2021-33033
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*