CVE-2020-36694
kernel: netfilter: use-after-free in the packet processing context
Severity Score
6.7
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
1
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.
A use-after-free flaw was found in the packet processing context in net/netfilter/x_tables.c in netfilter in the Linux Kernel. This issue occurs when the per-CPU sequence count is mishandled during concurrent iptables rules replacement and can be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2023-05-21 CVE Reserved
- 2023-05-21 CVE Published
- 2024-08-04 CVE Updated
- 2024-08-04 First Exploit
- 2024-08-25 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-416: Use After Free
CAPEC
References (7)
| URL | Tag | Source |
|---|---|---|
| https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10 | Release Notes | |
| https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12 | Release Notes | |
| https://security.netapp.com/advisory/ntap-20230622-0005 |
|
| URL | Date | SRC |
|---|---|---|
| https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2 | 2024-08-04 |
| URL | Date | SRC |
|---|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5c | 2023-06-22 |
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2020-36694 | 2021-05-18 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2212140 | 2021-05-18 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.10 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10" | - |
Affected
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