VDB
CVE-2018-18955
CVE-2018-18955
PUBLISHED
In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction.
EPSS 9.57% · 93.0th percentile
Risk Scores
EPSS Score
9.57%
93.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:14.04:LTS | linux-azure | 4.15.0-1030.31~14.04.1, 4.15.0-1023.24~14.04.1, 0 |
| Ubuntu:18.04:LTS | linux-oem | 4.15.0-1013.16, 4.15.0-1012.15, 4.15.0-1009.12 |
| Ubuntu:18.04:LTS | linux-raspi2 | 4.15.0-1027.29, 4.15.0-1010.11, 4.15.0-1021.23 |
| Ubuntu:16.04:LTS | linux-azure | 4.13.0-1018.21, 4.13.0-1011.14, * |
| Ubuntu:18.04:LTS | linux-kvm | 4.15.0-1020.20, 4.15.0-1016.16, 4.15.0-1012.12 |
| Ubuntu:16.04:LTS | linux-gcp | 4.13.0-1006.9, 0, 4.10.0-1006.6 |
| Ubuntu:18.04:LTS | linux-gcp | 4.15.0-1001.1, 4.15.0-1010.10, 4.15.0-1014.14 |
| Ubuntu:16.04:LTS | linux-hwe | 4.8.0-42.45~16.04.1, 4.8.0-41.44~16.04.1, 4.8.0-39.42~16.04.1 |
| Ubuntu:18.04:LTS | linux-aws | 4.15.0-1003.3, 4.15.0-1001.1, 0 |
| Ubuntu:18.04:LTS | linux-azure | 4.15.0-1025.26, 4.15.0-1028.29, 4.15.0-1031.32 |
| Ubuntu:18.04:LTS | linux | 4.15.0-23.25, 4.15.0-29.31, 4.15.0-32.35 |
Exploit Intelligence
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc-repo)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc-repo)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc-repo)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc-repo)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc-repo)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc-repo)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc)
- 💀 Linux local root exploit for CVE-2018-18955 (github-poc)
…and 21 more exploits
Timeline
- Nov 16, 2018 CVE Published
- Nov 16, 2018 PoC Published
- Nov 28, 2018 PoC Published
- Jul 26, 2019 PoC Published
- Apr 14, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Sep 14, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Dec 27, 2021 EPSS Score
- Feb 28, 2022 EPSS Score
- May 13, 2022 EPSS Score
- Jul 3, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2018-18955 third-party-advisory
- https://ubuntu.com/security/notices/USN-3832-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-3833-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-3836-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-3835-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-3836-2 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2018-18955 third-party-advisory