Description
The Linux kernel before 5.17.9 allows TCP servers to identify clients by observing what source ports are used. This occurs because of use of Algorithm 4 ("Double-Hash Port Selection Algorithm") of RFC 6056.
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 | 5.17.11-1 | — |
| Debian 13 | linux | 5.17.11-1 | — |
| Debian 12 | linux | 5.17.11-1 | — |
| Debian 10 | linux | 4.19.249-2 | DSA-5173-1 |
| Debian 9 | linux | 4.9.320-2 | DLA-3065-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux | 5.15.0-47.51 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1019.23 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1019.24 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1017.23 | — |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1015.18 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1002.4 | — |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1013.15 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1013.17 | USN-5616-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1017.21 | — |
| Ubuntu 22.04 LTS | linux-lowlatency | 5.15.0-47.53 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1007.7 | — |
| Ubuntu 22.04 LTS | linux-oem-5.17 | 5.17.0-1011.12 | — |
| Ubuntu 22.04 LTS | linux-oem-6.0 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1017.22 | — |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1014.16 | — |
| Ubuntu 22.04 LTS | linux-riscv | 5.15.0-1018.21 | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-126.142 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1085.92 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1019.23~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1091.96 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1019.24~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure-fde | 5.4.0-1091.96+cvm1.1 | USN-5639-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1046.51 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1089.97 | USN-5647-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1017.23~20.04.2 | — |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1083.89 | USN-5654-1 |
| Ubuntu 20.04 LTS | linux-gke-5.15 | 5.15.0-1015.18~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1053.56 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-48.54~20.04.1 | USN-5623-1 |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1033.37 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1015.20~20.04.2 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1004.6 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1075.80 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-oem-5.14 | 5.14.0-1044.49 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1083.91 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1017.22~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1070.80 | USN-5622-1 |
| Ubuntu 20.04 LTS | linux-riscv +22 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1018.21~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-194.205 | USN-5669-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1142.154 | USN-5678-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1085.92~18.04.1 | USN-5622-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1153.168 | USN-5687-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1091.96~18.04.1 | USN-5622-1 |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1054.59 | USN-5669-1 |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1137.153 | USN-5678-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1089.97~18.04.1 | USN-5660-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-126.142~18.04.1 | USN-5622-1 |
| Ubuntu 18.04 LTS | linux-ibm-5.4 | 5.4.0-1033.37~18.04.1 | USN-5622-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1128.133 | USN-5669-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1107.118 | USN-5669-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1083.91~18.04.1 | USN-5622-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1070.80~18.04.1 | USN-5630-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1120.128 | USN-5669-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1138.148 | USN-5669-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1020.20 | — |
| 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 | 5.4.0-1085.92+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1091.96+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1061.69 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1089.97+fips1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2081.87 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2062.68 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1099.110 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2047.52 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1114.123~20.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux +2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1142.154~16.04.1 | USN-5679-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1153.168~16.04.1 | USN-5684-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1137.153~16.04.1 | USN-5695-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-194.205~16.04.1 | USN-5669-2 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1107.118~16.04.1 | USN-5669-2 |
| Ubuntu Pro 14.04 LTS | linux +2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1153.168~14.04.1 | USN-5684-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.28.1 | SUSE-SU-2022:3844-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.28.1.150400.24.9.5 | SUSE-SU-2022:3844-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-150200.24.134.1.150200.9.63.2 | SUSE-SU-2022:3704-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.134.1 | SUSE-SU-2022:3704-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-150100.197.126.1 | SUSE-SU-2022:3693-1 |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP2 | kernel-default-base | 5.3.18-150200.24.134.1.150200.9.63.2 | SUSE-SU-2022:3704-1 |
| SLES for SAP 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.134.1 | SUSE-SU-2022:3704-1 |
| SLES for SAP 15 SP1 | kernel-docs +4 | 4.12.14-150100.197.126.1 | SUSE-SU-2022:3693-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.28.1 | SUSE-SU-2022:3844-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.28.1.150400.24.9.5 | SUSE-SU-2022:3844-1 |
| SLE Micro 5.2 | kernel-rt | 5.3.18-150300.106.1 | SUSE-SU-2022:3809-1 |
| SLE Micro 5.1 | kernel-rt | 5.3.18-150300.106.1 | SUSE-SU-2022:3809-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.28.1 | SUSE-SU-2022:3844-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4-RT_Update_1 | 1-150400.1.3.1 | SUSE-SU-2022:4617-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_4 | 1-150400.9.3.5 | SUSE-SU-2022:3844-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-150200.24.134.1 | SUSE-SU-2022:3704-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_31 | 1-150200.5.3.2 | SUSE-SU-2022:3704-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-150100.197.126.1 | SUSE-SU-2022:3693-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_35 | 1-150100.3.3.1 | SUSE-SU-2022:3693-1 |
| SLE HPC 15 SP2 | kernel-default-base | 5.3.18-150200.24.134.1.150200.9.63.2 | SUSE-SU-2022:3704-1 |
| SLE HPC 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.134.1 | SUSE-SU-2022:3704-1 |
| SLE HPC 15 SP1 | kernel-docs +4 | 4.12.14-150100.197.126.1 | SUSE-SU-2022:3693-1 |
| SUSE Real Time Module 15 SP4 | kernel-rt +3 | 5.14.21-150400.15.5.1 | SUSE-SU-2022:4617-1 |
| SUSE Real Time Module 15 SP3 | kernel-rt +3 | 5.3.18-150300.106.1 | SUSE-SU-2022:3809-1 |
| SUSE Manager Server 4.1 | kernel-default-base | 5.3.18-150200.24.134.1.150200.9.63.2 | SUSE-SU-2022:3704-1 |
| SUSE Manager Server 4.1 | kernel-docs +5 | 5.3.18-150200.24.134.1 | SUSE-SU-2022:3704-1 |
| SUSE Manager Retail Branch Server 4.1 | kernel-default-base | 5.3.18-150200.24.134.1.150200.9.63.2 | SUSE-SU-2022:3704-1 |
| SUSE Manager Retail Branch Server 4.1 | kernel-docs +4 | 5.3.18-150200.24.134.1 | SUSE-SU-2022:3704-1 |
| SUSE Manager Proxy 4.1 | kernel-default-base | 5.3.18-150200.24.134.1.150200.9.63.2 | SUSE-SU-2022:3704-1 |
| SUSE Manager Proxy 4.1 | kernel-docs +4 | 5.3.18-150200.24.134.1 | SUSE-SU-2022:3704-1 |
| SUSE Enterprise Storage 7 | kernel-default-base | 5.3.18-150200.24.134.1.150200.9.63.2 | SUSE-SU-2022:3704-1 |
| SUSE Enterprise Storage 7 | kernel-docs +5 | 5.3.18-150200.24.134.1 | SUSE-SU-2022:3704-1 |
| SUSE Enterprise Storage 6 | kernel-docs +4 | 4.12.14-150100.197.126.1 | SUSE-SU-2022:3693-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | dtb-aarch64 +6 | 5.14.21-150400.24.28.1 | SUSE-SU-2022:3844-1 |
| openSUSE Leap 15.4 | kernel-debug +4 | 4.12.14-150100.197.126.1 | SUSE-SU-2022:3844-1, SUSE-SU-2022:3693-1 |
| openSUSE Leap 15.4 | kernel-default-base | 5.14.21-150400.24.28.1.150400.24.9.5 | SUSE-SU-2022:3844-1 |
| openSUSE Leap 15.4 | kernel-rt +3 | 5.14.21-150400.15.5.1 | SUSE-SU-2022:4617-1 |
| openSUSE Leap 15.3 | kernel-debug +4 | 4.12.14-150100.197.126.1 | SUSE-SU-2022:3693-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.2 | kernel-rt | 5.3.18-150300.106.1 | SUSE-SU-2022:3809-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.285-215.501 | 1.0-0.amzn2 | ALAS2-2022-1813 |
| Amazon Linux 2 | perf +8 | 4.14.285-215.501.amzn2 | ALAS2-2022-1813 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.48.1-2 | — |
Advisories 29
- SSA-794697 SSA-794697: Vulnerabilities in the Additional GNU/Linux Subsystem of the SIMATIC S7-1500 TM MFP Before V1.1 Siemens ProductCERT · Oct 13, 2026
- USN-5630-1 linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5679-1 linux-aws-hwe vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5654-1 linux-gke vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5660-1 linux-gcp-5.4 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5616-1 linux-intel-iotg vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5669-2 linux-hwe, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5678-1 linux-aws, linux-gcp-4.15 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5647-1 linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5622-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-bluefield, linux-gkeop, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5669-1 linux, linux-dell300x, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5684-1 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5687-1 linux-azure-4.15 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5695-1 linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5623-1 linux-hwe-5.15, linux-lowlatency-hwe-5.15 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5639-1 linux-azure-fde vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- WID-SEC-2022-0299 Linux Kernel: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Mar 9, 2026
- DSA-5173-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3065-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2022:3693-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4617-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3844-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3704-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2022-1813 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 2, 2025
- SUSE-SU-2022:3809-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ICSA-23-166-11 Siemens SIMATIC S7-1500 TM MFP Linux Kernel CISA ICS & IT advisories · Apr 9, 2024
- WID-SEC-2023-1432 Siemens SIMATIC S7: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 22, 2023
- ICSA-23-075-01 Siemens SCALANCE, RUGGEDCOM Third-Party CISA ICS & IT advisories · Mar 14, 2023
- SSA-419740 SSA-419740: Multiple Third-Party Component Vulnerabilities in RUGGEDCOM and SCALANCE Products before V7.2 Siemens ProductCERT · Mar 14, 2023
References
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4c2c8f03a5ab7cb04ec64724d7d176d00bcc91e5
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17.9
- [debian-lts-announce] 20220701 [SECURITY] [DLA 3065-1] linux security update mailing-list
- DSA-5173 vendor-advisory
- https://arxiv.org/abs/2209.12993
- https://github.com/0xkol/rfc6056-device-tracker