CVE-2021-4154
A use-after-free flaw was found in cgroup1_parse_param in kernel/cgroup/cgroup-v1.c in the Linux kernel's cgroup v1 parser. A local attacker with a user...
- Published
- Feb 4, 2022
- Updated
- Aug 3, 2024
- Assigning CNA
- redhat
- Evidence observed
- Aug 10, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HLow · next 30 days
- Percentile
- 66.5%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
A use-after-free flaw was found in cgroup1_parse_param in kernel/cgroup/cgroup-v1.c in the Linux kernel's cgroup v1 parser. A local attacker with a user privilege could cause a privilege escalation by exploiting the fsconfig syscall parameter leading to a container breakout and a denial of service on the system.
Sources
3- CVE-2021-4154Exploit
CVE-2021-4154 exploit
- DirtyCredResearch
Kernel exploitation technique
- kernel-exploit-factoryResearch
Linux kernel CVE exploit analysis report and relative debug environment. You don't need to compile Linux kernel and configure your environment anymore.
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