high
8.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2021-4154: Use After Free

First published: Tue Dec 14 2021(Updated: )

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.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:4.18.0-348.20.1.rt7.150.el8_5
0:4.18.0-348.20.1.rt7.150.el8_5
redhat/kernel<0:4.18.0-348.20.1.el8_5
0:4.18.0-348.20.1.el8_5
redhat/kernel-rt<0:4.18.0-305.34.2.rt7.107.el8_4
0:4.18.0-305.34.2.rt7.107.el8_4
redhat/kernel<0:4.18.0-305.34.2.el8_4
0:4.18.0-305.34.2.el8_4
Linux Linux kernel>=5.1<5.4.134
Linux Linux kernel>=5.5<5.10.52
Linux Linux kernel>=5.11<5.12.19
Linux Linux kernel>=5.13<5.13.4
Linux Linux kernel=5.14-rc1
Redhat Virtualization=4.0
Redhat Enterprise Linux=8.0
Netapp Hci Baseboard Management Controller=h300e
Netapp Hci Baseboard Management Controller=h300s
Netapp Hci Baseboard Management Controller=h410s
Netapp Hci Baseboard Management Controller=h500e
Netapp Hci Baseboard Management Controller=h500s
Netapp Hci Baseboard Management Controller=h700e
Netapp Hci Baseboard Management Controller=h700s
redhat/kernel<5.14
5.14

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2034514

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3b0462726e7ef281c35a7a4ae33e93ee2bc9975b

Remedy

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID for this issue?

    The vulnerability ID for this issue is CVE-2021-4154.

  • What is the severity of CVE-2021-4154?

    CVE-2021-4154 has a severity score of 8.8, which is considered high.

  • How does CVE-2021-4154 affect the Linux kernel's cgroup v1 parser?

    CVE-2021-4154 is a use-after-free flaw in cgroup1_parse_param in kernel/cgroup/cgroup-v1.c, which can lead to a privilege escalation, container breakout, and a denial of service attack.

  • Which software is affected by CVE-2021-4154?

    The affected software includes Google Android, Red Hat Kernel (up to version 5.14), Red Hat Kernel-RT (up to version 4.18.0-348.20.1), and Red Hat Kernel (up to version 4.18.0-305.34.2).

  • How can I fix the CVE-2021-4154 vulnerability?

    To fix the CVE-2021-4154 vulnerability, you should update your software to the recommended versions provided by the respective vendors.

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