Description
The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.
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 | — |
| Debian 9 | linux | 4.9.290-1 | DLA-2843-1 |
| Debian 9 | linux-4.19 | 4.19.208-1~deb9u1 | DLA-2785-1 |
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 | 5.4.0-89.100 | USN-5116-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1058.61 | USN-5116-2 |
| Ubuntu 20.04 LTS | linux-aws-5.11 | 5.11.0-1020.21~20.04.2 | USN-5113-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1062.65 | USN-5116-2 |
| Ubuntu 20.04 LTS | linux-azure-5.11 +1 | 5.11.0-1020.21~20.04.1 | USN-5113-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1020.23 | USN-5116-1 |
| Ubuntu 20.04 LTS | linux-gcp +1 | 5.4.0-1056.60 | USN-5116-2 |
| Ubuntu 20.04 LTS | linux-gcp-5.11 | 5.11.0-1021.23~20.04.1 | USN-5113-1 |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1054.57 | USN-5116-2 |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1025.26 | USN-5116-2 |
| Ubuntu 20.04 LTS | linux-hwe-5.11 | 5.11.0-38.42~20.04.1 | USN-5113-1 |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1006.7 | USN-5116-2 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1048.50 | USN-5116-1 |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1050.52 | USN-5115-1 |
| Ubuntu 20.04 LTS | linux-oem-5.13 | 5.13.0-1014.18 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1045.49 | USN-5116-2 |
| Ubuntu 20.04 LTS | linux-riscv +8 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.11 | 5.11.0-1021.22~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-161.169 | USN-5114-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1114.121 | USN-5114-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1058.61~18.04.3 | USN-5116-2 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1125.138 | USN-5114-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1062.65~18.04.1 | USN-5116-2 |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1029.34 | USN-5114-1 |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1110.124 | USN-5114-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 +1 | 5.4.0-1056.60~18.04.1 | USN-5116-2, USN-5116-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1054.57~18.04.1 | USN-5116-2 |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1025.26~18.04.1 | USN-5116-2 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-89.100~18.04.1 | USN-5116-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1101.103 | USN-5114-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1082.90 | USN-5114-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1045.49~18.04.1 | USN-5116-2 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1097.103 | USN-5114-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1114.123 | USN-5114-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 8 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 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | 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 | 5.4.0-1035.41 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2055.57 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2037.41 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1071.80 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2020.22 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1069.75 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-219.252 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1135.149 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1113.120~16.04.1 | USN-5114-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1125.138~16.04.1 | USN-5114-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1110.124~16.04.1 | USN-5114-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-161.169~16.04.1 | USN-5114-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1100.109 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1082.90~16.04.1 | USN-5114-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1099.104 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1125.138~14.04.1 | USN-5114-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-219.252~14.04.1 | USN-5343-1, USN-5299-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-59.34.1 | SUSE-SU-2021:3675-1 |
| SLES 15 SP3 | kernel-azure +1 | 5.3.18-38.28.2 | SUSE-SU-2021:3641-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-59.34.1.18.21.1 | SUSE-SU-2021:3675-1 |
| SLES 15 SP3 | kernel-syms-azure | 5.3.18-38.28.1 | SUSE-SU-2021:3641-1 |
| SLES 15 SP2 | kernel-azure +1 | 5.3.18-18.72.2 | SUSE-SU-2021:3640-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.93.1.9.42.5 | SUSE-SU-2021:3754-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-24.93.1 | SUSE-SU-2021:3754-1 |
| SLES 15 SP2 | kernel-syms-azure | 5.3.18-18.72.1 | SUSE-SU-2021:3640-1 |
| SLES 15 SP1 | kernel-docs +4 | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SLES 15 SP1 | kernel-obs-build | 4.12.14-197.102.1 | SUSE-SU-2021:3876-1 |
| SLES 15 | kernel-docs +1 | 4.12.14-150.78.2 | SUSE-SU-2021:3969-1 |
| SLES 15 | kernel-syms +4 | 4.12.14-150.78.1 | SUSE-SU-2021:3969-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.98.1 | SUSE-SU-2021:3748-1 |
Show 28 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.83.2 | SUSE-SU-2021:3972-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.161.1 | SUSE-SU-2021:3929-1 |
| SLES 11 SP4 | kernel-ec2 +8 | 3.0.101-108.132.1 | SUSE-SU-2021:14849-1 |
| SLES for SAP 15 SP1 | kernel-docs +3 | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SLES for SAP 15 SP1 | kernel-obs-build | 4.12.14-197.102.1 | SUSE-SU-2021:3876-1 |
| SLES for SAP 15 | kernel-docs +1 | 4.12.14-150.78.2 | SUSE-SU-2021:3969-1 |
| SLES for SAP 15 | kernel-syms +3 | 4.12.14-150.78.1 | SUSE-SU-2021:3969-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.98.1 | SUSE-SU-2021:3748-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.83.2 | SUSE-SU-2021:3972-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.65.1 | SUSE-SU-2021:3723-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-59.34.1 | SUSE-SU-2021:3675-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-59.34.1.18.21.1 | SUSE-SU-2021:3675-1 |
| SLE Micro 5.1 | kernel-rt | 5.3.18-60.1 | SUSE-SU-2021:3642-1 |
| SLE Micro 5.0 | kernel-default | 5.3.18-24.93.1 | SUSE-SU-2021:3754-1 |
| SLE Micro 5.0 | kernel-default-base | 5.3.18-24.93.1.9.42.5 | SUSE-SU-2021:3754-1 |
| SLE Micro 5.0 | kernel-rt | 5.3.18-57.1 | SUSE-SU-2021:3658-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-59.34.1 | SUSE-SU-2021:3675-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_9 | 1-7.3.1 | SUSE-SU-2021:3675-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.93.1 | SUSE-SU-2021:3754-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_21 | 1-5.3.5 | SUSE-SU-2021:3754-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_27 | 1-3.3.1 | SUSE-SU-2021:3876-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.78.1 | SUSE-SU-2021:3969-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_26 | 1-1.3.1 | SUSE-SU-2021:3969-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.98.1 | SUSE-SU-2021:3748-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_25 | 1-8.7.1 | SUSE-SU-2021:3748-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.83.2 | SUSE-SU-2021:3972-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_23 | 1-6.3.1 | SUSE-SU-2021:3972-1 |
| SLE HPC 15 SP1 | kernel-docs +3 | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SLE HPC 15 SP1 | kernel-obs-build | 4.12.14-197.102.1 | SUSE-SU-2021:3876-1 |
| SLE HPC 15 | kernel-docs +1 | 4.12.14-150.78.2 | SUSE-SU-2021:3969-1 |
| SLE HPC 15 | kernel-syms +3 | 4.12.14-150.78.1 | SUSE-SU-2021:3969-1 |
| SUSE Real Time Module 15 SP3 | kernel-rt +3 | 5.3.18-60.1 | SUSE-SU-2021:3642-1 |
| SUSE Real Time Module 15 SP2 | kernel-rt +3 | 5.3.18-57.1 | SUSE-SU-2021:3658-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.83.2 | SUSE-SU-2021:3972-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SUSE OpenStack Cloud 9 | kernel-syms +2 | 4.12.14-95.83.2 | SUSE-SU-2021:3972-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SUSE Enterprise Storage 6 | kernel-docs +3 | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SUSE Enterprise Storage 6 | kernel-obs-build | 4.12.14-197.102.1 | SUSE-SU-2021:3876-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | dtb-aarch64 +7 | 5.3.18-59.34.1 | openSUSE-SU-2021:3675-1 |
| openSUSE Leap 15.3 | kernel-azure +1 | 5.3.18-38.28.2 | openSUSE-SU-2021:3641-1 |
| openSUSE Leap 15.3 | kernel-debug +4 | 4.12.14-197.102.2 | openSUSE-SU-2021:3876-1, openSUSE-SU-2021:3675-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-59.34.1.18.21.1 | openSUSE-SU-2021:3675-1 |
| openSUSE Leap 15.3 | kernel-syms-azure | 5.3.18-38.28.1 | openSUSE-SU-2021:3641-1 |
| openSUSE Leap 15.2 | kernel-default-base | 5.3.18-lp152.102.1.lp152.8.49.1 | openSUSE-SU-2021:1477-1 |
| openSUSE Leap 15.2 | kernel-docs +8 | 5.3.18-lp152.102.1 | openSUSE-SU-2021:1477-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.10.78.1-1 | — |
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 3 repositories
-
0xdevil/CVE-2021-42008 ★ 31 · Dec 3, 2021
CVE-2021-42008: Exploiting A 16-Year-Old Vulnerability In The Linux 6pack Driver
-
numanturle/CVE-2021-42008 ★ 2 · Dec 3, 2021
Exploiting A 16-Year-Old Vulnerability In The Linux 6pack Driver
-
WhatsWrongAndWhy/CVE-2021-42008 ★ 0 · Jul 21, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 27
- USN-5115-1 linux-oem-5.10 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5116-1 linux, linux-bluefield, linux-gcp-5.4, linux-hwe-5.4, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-5116-2 linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-ibm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-5113-1 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-5299-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5343-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5114-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- DLA-2843-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2785-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:3641-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3929-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3675-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3876-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3969-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3642-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3640-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3935-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1477-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3641-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14849-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3754-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3972-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3748-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3658-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3723-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:3876-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:3675-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 7, 2025
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19d1532a187669ce86d5a2696eb7275310070793
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.13
- https://www.youtube.com/watch?v=d5f9xLK8Vhw
- https://security.netapp.com/advisory/ntap-20211104-0002/
- [debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update mailing-list