Description
An issue was discovered in net/tipc/crypto.c in the Linux kernel before 5.14.16. The Transparent Inter-Process Communication (TIPC) functionality allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.
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 | 5.14.16-1 | — |
| Debian 13 | linux | 5.14.16-1 | — |
| Debian 12 | linux | 5.14.16-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | linux-aws-5.11 +2 | 5.11.0-1023.24~20.04.1 | USN-5208-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.11 | 5.11.0-1024.26~20.04.1 | USN-5208-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.11 | 5.11.0-44.48~20.04.2 | USN-5208-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.13 | 5.13.0-23.23~20.04.2 | — |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1053.55 | USN-5207-1 |
| Ubuntu 20.04 LTS | linux-oem-5.13 | 5.13.0-1026.32 | USN-5218-1 |
| Ubuntu 20.04 LTS | linux-oem-5.14 | 5.14.0-1008.8 | USN-5165-1 |
| Ubuntu 20.04 LTS | linux-riscv +8 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.11 | 5.11.0-1024.25~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +12 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-348.2.1.rt7.132.el8_5 | RHSA-2021:4646 |
| RHEL 8 | kpatch-patch-4_18_0-348 | 1-1.el8 | RHSA-2021:4645 |
| RHEL 8 | perf +26 | 4.18.0-348.2.1.el8_5 | RHSA-2021:4647 |
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 | 4.4.9-202111172338_8.5 | RHSA-2021:4750 |
| RHEL 8.4 EUS | kernel-rt +12 | 4.18.0-305.28.1.rt7.100.el8_4 | RHSA-2021:4648 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305 | 1-8.el8 | RHSA-2021:4644 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_10_2 | 1-5.el8_4 | RHSA-2021:4644 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_12_1 | 1-4.el8_4 | RHSA-2021:4644 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_17_1 +1 | 1-3.el8_4 | RHSA-2021:4644 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_25_1 | 1-2.el8_4 | RHSA-2021:4644 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_3_1 | 1-7.el8_4 | RHSA-2021:4644 |
| RHEL 8.4 EUS | kpatch-patch-4_18_0-305_7_1 | 1-6.el8_4 | RHSA-2021:4644 |
| RHEL 8.4 EUS | perf +26 | 4.18.0-305.28.1.el8_4 | RHSA-2021:4650 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-tools-libs-devel | 4.18.0-348.2.1.el8_5 | ALSA-2021:4647 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | kernel | 4.18.0-348.2.1.el8_5 | RLSA-2021:4647 |
| Rocky Linux 8 | kernel-rt | 4.18.0-348.2.1.rt7.132.el8_5 | RLSA-2021:4646 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.10.78.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-348.2.1.el8_5 | ELSA-2021-4647 |
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
-
zzhacked/CVE-2021-43267 ★ 4 · Nov 26, 2021
Local PoC exploit for CVE-2021-43267 (Linux TIPC)
-
DarkSprings/CVE-2021-43267-POC ★ 0 · Nov 9, 2021
trusty poc Provide it to legitimate people
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 16
- ALSA-2021:4647 Important: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-5208-1 linux, linux-aws, linux-aws-5.11, linux-azure, linux-azure-5.11, linux-gcp, linux-gcp-5.11, linux-hwe-5.11, linux-kvm, linux-oracle, linux-oracle-5.11, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-5165-1 linux-oem-5.14 vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-5218-1 linux-oem-5.13 vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- RHSA-2021:4750 Red Hat Security Advisory: Red Hat Virtualization Host security and bug fix update [ovirt-4.4.9] 0-day Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2021:4650 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2021:4647 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2021:4648 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2021:4645 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2021:4646 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2021:4644 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-5207-1 linux-oem-5.10 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- RLSA-2021:4647 Important: kernel security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2021:4646 Important: kernel-rt security and bug fix update Rocky Linux Security Advisories · Feb 4, 2026
- WID-SEC-2022-0112 Google Android: Mehrere Schwachstellen ermöglichen Privilegieneskalation BSI CERT-Bund (WID) · Jul 3, 2024
- ELSA-2021-4647 Important: kernel security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 18, 2021
References
- https://github.com/torvalds/linux/commit/fa40d9734a57bcbfa79a280189799f76c88f7bb0
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16
- FEDORA-2021-a093973910 vendor-advisory
- FEDORA-2021-bdd146e463 vendor-advisory
- https://security.netapp.com/advisory/ntap-20211125-0002/
- [oss-security] 20220210 CVE-2022-0435: Remote Stack Overflow in Linux Kernel TIPC Module since 4.8 (net/tipc) mailing-list