Description
In the Linux kernel, the following vulnerability has been resolved:
smack: tcp: ipv4, fix incorrect labeling
Currently, Smack mirrors the label of incoming tcp/ipv4 connections:
when a label 'foo' connects to a label 'bar' with tcp/ipv4,
'foo' always gets 'foo' in returned ipv4 packets. So,
1) returned packets are incorrectly labeled ('foo' instead of 'bar')
2) 'bar' can write to 'foo' without being authorized to write.
Here is a scenario how to see this:
* Take two machines, let's call them C and S,
with active Smack in the default state
(no settings, no rules, no labeled hosts, only builtin labels)
* At S, add Smack rule 'foo bar w'
(labels 'foo' and 'bar' are instantiated at S at this moment)
* At S, at label 'bar', launch a program
that listens for incoming tcp/ipv4 connections
* From C, at label 'foo', connect to the listener at S.
(label 'foo' is instantiated at C at this moment)
Connection succeedes and works.
* Send some data in both directions.
* Collect network traffic of this connection.
All packets in both directions are labeled with the CIPSO
of the label 'foo'. Hence, label 'bar' writes to 'foo' without
being authorized, and even without ever being known at C.
If anybody cares: exactly the same happens with DCCP.
This behavior 1st manifested in release 2.6.29.4 (see Fixes below)
and it looks unintentional. At least, no explanation was provided.
I changed returned packes label into the 'bar',
to bring it into line with the Smack documentation claims.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 2.6.30 | 4.19.322 |
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 | 6.10.9-1 | — |
| Debian 13 | linux | 6.10.9-1 | — |
| Debian 12 | linux | 6.1.112-1 | — |
| Debian 11 | linux-6.1 | 6.1.119-1~deb11u1 | DLA-4008-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1056.58 | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-50.51 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1020.22 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1020.23 | USN-7196-1 |
| Ubuntu 24.04 LTS | linux-gcp +1 | 6.8.0-1019.21 | USN-7155-1, USN-7154-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1015.19 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1002.4 | USN-7156-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1017.17 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1019.21.1 | USN-7155-1 |
| Ubuntu 24.04 LTS | linux-oem-6.8 | 6.8.0-1018.18 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-oracle +1 | 6.8.0-1017.18 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1016.18 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-riscv +1 | 6.8.0-50.51.1 | USN-7154-1 |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-125.135 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1072.78 | USN-7100-2 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1020.22~22.04.1 | USN-7154-1 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1075.84 | USN-7123-1 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1020.23~22.04.1 | USN-7196-1 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1076.85.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1071.79 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 +1 | 6.8.0-1019.21~22.04.1 | USN-7155-1, USN-7154-1 |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1069.75 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1055.62 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 | 6.8.0-50.51~22.04.1 | USN-7154-2 |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1065.68 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1017.17~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1067.73 | USN-7144-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1069.74 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1067.68 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1032.32 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1020.20 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1070.76 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1017.18~22.04.1 | USN-7154-1 |
| Ubuntu 22.04 LTS | linux-riscv +31 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv-6.8 +1 | 6.8.0-50.51.1~22.04.1 | USN-7154-1 |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1038.42 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux | 5.4.0-200.220 | USN-7088-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1135.145 | USN-7088-4 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1072.78~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1140.147 | USN-7088-2 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1078.87~20.04.1 | USN-7194-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1095.102 | USN-7088-2 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1139.148 | USN-7088-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1071.79~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-gke +26 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1102.106 | USN-7088-1 |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1055.62~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-125.135~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1082.87 | USN-7088-1 |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1065.68~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1067.73~20.04.1 | USN-7144-1 |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1044.45 | USN-7119-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1123.131 | USN-7088-4 |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1032.32~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1134.143 | USN-7088-4 |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1070.76~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1119.131 | USN-7088-5 |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1068.72~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1054.58 | USN-7088-4 |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2015.16 | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1013.14 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1066.68 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1073.81 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1013.14~22.04.1 | — |
| 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 24.04 LTS | linux-fips | 6.8.0-78.78+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-aws-fips | 5.15.0-1072.78+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1075.84+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-125.135+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1071.79+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1135.145+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1140.147+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1109.119 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1139.148+fips1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2127.133 | USN-8112-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2106.112 | USN-8112-4 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1144.156 | USN-8112-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2090.96 | USN-8112-2 |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1122.129 | USN-8070-3 |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-247.259 | USN-8112-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1189.202 | USN-8112-1 |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1135.145~18.04.1 | USN-7088-3 |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1197.212 | USN-8112-3 |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1140.147~18.04.1 | USN-7088-4 |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1182.199 | USN-8112-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1139.148~18.04.1 | USN-7088-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-200.220~18.04.1 | USN-7088-1 |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1082.87~18.04.1 | USN-7088-1 |
| Ubuntu Pro 18.04 LTS | linux-kvm | 4.15.0-1171.176 | USN-8112-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle | 4.15.0-1151.162 | USN-8112-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1134.143~18.04.1 | USN-7088-3 |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1119.131~18.04.1 | USN-7088-5 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-278.312 | USN-8070-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1190.205 | USN-8070-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1189.202~16.04.1 | USN-8112-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1197.212~16.04.1 | USN-8112-3 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1182.199~16.04.1 | USN-8112-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-247.259~16.04.1 | USN-8112-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1153.164 | USN-8070-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1151.162~16.04.1 | USN-8112-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1152.158 | USN-8070-2 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1197.212~14.04.1 | USN-8112-5 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-278.312~14.04.1 | USN-8070-2 |
Advisories 28
- USN-8112-1 linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8112-5 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8112-2 linux-aws-fips, linux-fips, linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8112-3 linux-azure, linux-azure-4.15 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8112-4 linux-azure-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8070-1 linux, linux-aws, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8070-2 linux-aws, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-8070-3 linux-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7100-1 linux, linux-aws-5.15, linux-gcp, linux-gcp-5.15, linux-gke, linux-gkeop, linux-gkeop-5.15, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-oracle-5.15, linux-raspi, linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7154-1 linux, linux-aws, linux-aws-6.8, linux-gcp, linux-gcp-6.8, linux-gke, linux-ibm, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-oem-6.8, linux-oracle, linux-oracle-6.8, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7088-1 linux, linux-gcp, linux-gcp-5.4, linux-gkeop, linux-hwe-5.4, linux-ibm, linux-ibm-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7088-4 linux-aws, linux-azure-5.4, linux-kvm, linux-oracle, linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7155-1 linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7144-1 linux-intel-iotg, linux-intel-iotg-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7194-1 linux-azure-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7196-1 linux-azure, linux-azure-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7088-5 linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7088-3 linux-aws-5.4, linux-oracle-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7088-2 linux-azure, linux-bluefield vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7156-1 linux-gkeop vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7100-2 linux-aws vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7123-1 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7119-1 linux-iot vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7154-2 linux-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- WID-SEC-2024-3134 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 6, 2026
- DLA-4008-1 linux-6.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ICSA-25-226-07 Siemens Third-Party Components in SINEC OS CISA ICS & IT advisories · Feb 25, 2026
- SSA-355557 SSA-355557: Multiple Vulnerabilities in Third-Party Components in SINEC OS before V3.2 Siemens ProductCERT · Feb 24, 2026
References
- https://git.kernel.org/stable/c/d3f56c653c65f170b172d3c23120bc64ada645d8
- https://git.kernel.org/stable/c/5b4b304f196c070342e32a4752e1fa2e22fc0671
- https://git.kernel.org/stable/c/a948ec993541db4ef392b555c37a1186f4d61670
- https://git.kernel.org/stable/c/0aea09e82eafa50a373fc8a4b84c1d4734751e2c
- https://git.kernel.org/stable/c/0776bcf9cb6de46fdd94d10118de1cf9b05f83b9
- https://git.kernel.org/stable/c/4be9fd15c3c88775bdf6fa37acabe6de85beebff
- https://git.kernel.org/stable/c/d3703fa94116fed91f64c7d1c7d284fb4369070f
- https://git.kernel.org/stable/c/2fe209d0ad2e2729f7e22b9b31a86cc3ff0db550