Use After Free in Linux Kernel
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 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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.012 (68.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Linux Kernel — versions 5.14
- NetApp Hci Baseboard Management Controller — versions h300e, h300s, h410s
- Red Hat Enterprise Linux — versions 8.0
- Red Hat Virtualization — versions 4.0
- Kernel — versions Fixed in kernel 5.14 rc2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
- cloud.google.com/anthos/clusters/docs/security-bulletins (Third Party Advisory)
- security.netapp.com/advisory/ntap-20220225-0004/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4154?
- CVE-2021-4154 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 8.8/10. Published 2022-02-04.
- How severe is CVE-2021-4154?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-4154 known to be exploited?
- 27 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.