Vulnerability · Published May 21, 2023 · Assigned by mitre
CVE-2020-36694
Medium 6.7
In plain English
A medium-severity use-after-free in the linux package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Severity (CVSS 3.1)6.7Medium
Exploit odds (30 days)0.4%top 61.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | no fix listed | DEBIAN-CVE-2020-36694 |
| Debian:13 | linux | no fix listed | DEBIAN-CVE-2020-36694 |
| Debian:14 | linux | no fix listed | DEBIAN-CVE-2020-36694 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2020-36694 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2020-36694 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2020-36694 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2020-36694 |
Affected products (as reported)
Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5c
- https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12
- https://security.netapp.com/advisory/ntap-20230622-0005/