Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | kernel | Fixed in kernel 5.14 rc2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.14.6-1 | — |
| Debian 13 | linux | 5.14.6-1 | — |
| Debian 12 | linux | 5.14.6-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-88.99 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1057.60 | — |
| Ubuntu 20.04 LTS | linux-aws-5.11 +1 | 5.11.0-1019.20~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1059.62 | — |
| Ubuntu 20.04 LTS | linux-azure-5.11 | 5.11.0-1017.18~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1019.22 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1053.57 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.11 | 5.11.0-1020.22~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1053.56 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1024.25 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1005.6 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1047.49 | — |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1049.51 | — |
| Ubuntu 20.04 LTS | linux-oem-5.13 | 5.13.0-1014.18 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1055.59 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1044.48 | — |
| Ubuntu 20.04 LTS | linux-riscv +10 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.11 | 5.11.0-1020.21~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1057.60~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1059.62~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +12 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1053.57~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1053.56~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1024.25~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-87.98~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1055.59~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1044.48~18.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1034.40 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-348.20.1.rt7.150.el8_5 | RHSA-2022:0819 |
| RHEL 8 | kpatch-patch-4_18_0-348 | 1-3.el8 | RHSA-2022:0849 |
| RHEL 8 | kpatch-patch-4_18_0-348_12_2 | 1-1.el8_5 | RHSA-2022:0849 |
| RHEL 8 | kpatch-patch-4_18_0-348_2_1 +1 | 1-2.el8_5 | RHSA-2022:0849 |
| RHEL 8 | perf +26 | 4.18.0-348.20.1.el8_5 | RHSA-2022:0825 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhev Hypervisor 4 | redhat-virtualization-host +1 | 4.4.10-202203101736_8.5 | RHSA-2022:0841 |
| RHEL 8.4 EUS | kernel-rt +12 | 4.18.0-305.34.2.rt7.107.el8_4 | RHSA-2022:0187 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305 | 1-10.el8 | RHSA-2022:0231 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_10_2 | 1-7.el8_4 | RHSA-2022:0231 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_12_1 | 1-6.el8_4 | RHSA-2022:0231 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_17_1 +1 | 1-5.el8_4 | RHSA-2022:0231 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_25_1 | 1-4.el8_4 | RHSA-2022:0231 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_28_1 +1 | 1-2.el8_4 | RHSA-2022:0231 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_3_1 | 1-9.el8_4 | RHSA-2022:0231 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_7_1 | 1-8.el8_4 | RHSA-2022:0231 |
| RHEL 8.4 EUS | perf +26 | 4.18.0-305.34.2.el8_4 | RHSA-2022:0186 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-tools-libs-devel | 4.18.0-348.20.1.el8_5 | ALSA-2022:0825 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | kernel | 4.18.0-348.20.1.el8_5 | RLSA-2022:0825 |
| Rocky Linux 8 | kernel-rt | 4.18.0-348.20.1.rt7.150.el8_5 | RLSA-2022:0819 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-150300.59.68.1 | SUSE-SU-2022:1687-1 |
| SLES 15 SP3 | kernel-azure +2 | 5.3.18-150300.38.56.1 | SUSE-SU-2022:1676-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-150300.59.68.1.150300.18.41.3 | SUSE-SU-2022:1687-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Real Time 15 SP3 | release-notes-sle_rt | 15.3.20220422-150300.3.3.2 | SUSE-SU-2022:1669-1 |
| SLE Micro 5.2 | kernel-default | 5.3.18-150300.59.68.1 | SUSE-SU-2022:1687-1 |
| SLE Micro 5.2 | kernel-default-base | 5.3.18-150300.59.68.1.150300.18.41.3 | SUSE-SU-2022:1687-1 |
| SLE Micro 5.2 | kernel-rt | 5.3.18-150300.88.2 | SUSE-SU-2022:1669-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-150300.59.68.1 | SUSE-SU-2022:1687-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-150300.59.68.1.150300.18.41.3 | SUSE-SU-2022:1687-1 |
| SLE Micro 5.1 | kernel-rt | 5.3.18-150300.88.2 | SUSE-SU-2022:1669-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-150300.59.68.1 | SUSE-SU-2022:1687-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_0 | 10-3.2 | SUSE-SU-2022:0293-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_1 +2 | 8-150300.2.2 | SUSE-SU-2022:0295-1, SUSE-SU-2022:0257-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_18 | 1-150300.7.5.1 | SUSE-SU-2022:1687-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_4 | 7-150300.2.2 | SUSE-SU-2022:0257-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_5 | 6-150300.2.2 | SUSE-SU-2022:0257-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_10 | 14-2.2 | SUSE-SU-2022:0291-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_11 | 13-2.2 | SUSE-SU-2022:0291-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_12 +1 | 10-2.2 | SUSE-SU-2022:0292-1, SUSE-SU-2022:0254-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_14 +2 | 8-2.2 | SUSE-SU-2022:0254-1, SUSE-SU-2022:0241-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_17 | 7-2.2 | SUSE-SU-2022:0241-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_18 | 6-2.2 | SUSE-SU-2022:0241-1 |
| SUSE Real Time Module 15 SP3 | kernel-rt +2 | 5.3.18-150300.88.2 | SUSE-SU-2022:1669-1 |
| SUSE Real Time Module 15 SP3 | kernel-syms-rt | 5.3.18-150300.88.1 | SUSE-SU-2022:1669-1 |
| SUSE Real Time Module 15 SP3 | release-notes-sle_rt | 15.3.20220422-150300.3.3.2 | SUSE-SU-2022:1669-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | dtb-aarch64 +1 | 5.3.18-150300.59.68.1 | SUSE-SU-2022:1687-1 |
| openSUSE Leap 15.3 | dtb-aarch64 +11 | 5.3.18-150300.59.68.1 | SUSE-SU-2022:1687-1 |
| openSUSE Leap 15.3 | kernel-azure +2 | 5.3.18-150300.38.56.1 | SUSE-SU-2022:1676-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-150300.59.68.1.150300.18.41.3 | SUSE-SU-2022:1687-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-348.20.1.el8_5 | ELSA-2022-0825 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 2 repositories
-
Markakd/CVE-2021-4154 ★ 66 · Aug 11, 2022
CVE-2021-4154 exploit
-
veritas501/CVE-2021-4154 ★ 7 · Feb 23, 2023
CVE-2021-4154
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 23
- ALSA-2022:0825 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2022:0841 Red Hat Security Advisory: Red Hat Virtualization Host security and bug fix update [ovirt-4.4.10] Async #1 Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:0849 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2022:0825 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2022:0819 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2022:0231 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2022:0187 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2022:0186 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RLSA-2022:0819 Important: kernel-rt security and bug fix update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2022:0825 Important: kernel security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2022:1687-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1669-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1676-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0295-1 Security update for the Linux Kernel (Live Patch 3 for SLE 15 SP3) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0292-1 Security update for the Linux Kernel (Live Patch 13 for SLE 15 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0291-1 Security update for the Linux Kernel (Live Patch 11 for SLE 15 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0254-1 Security update for the Linux Kernel (Live Patch 12 for SLE 15 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0241-1 Security update for the Linux Kernel (Live Patch 14 for SLE 15 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0257-1 Security update for the Linux Kernel (Live Patch 2 for SLE 15 SP3) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0293-1 Security update for the Linux Kernel (Live Patch 0 for SLE 15 SP3) SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2022-0137 Android Patchday Juni 2022 BSI CERT-Bund (WID) · Jun 24, 2024
- WID-SEC-2022-0515 IBM Spectrum Protect: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 8, 2023
- ELSA-2022-0825 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 11, 2022
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2034514
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3b0462726e7ef281c35a7a4ae33e93ee2bc9975b
- https://cloud.google.com/anthos/clusters/docs/security-bulletins#gcp-2022-002
- https://security.netapp.com/advisory/ntap-20220225-0004/