# CVE-2024-47659: linux: In the Linux kernel, the following vulnerability has been resolved:  smack: tcp: ipv4, fix incorrect labeling  Curren...

CVE-2024-47659 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-47659, released October 9, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-47659
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0078
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 9, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.112-1 | [DEBIAN-CVE-2024-47659](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47659.md) | Oct 9, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.10.9-1 | [DEBIAN-CVE-2024-47659](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47659.md) | Oct 9, 2024 |
| Linux | linux Debian 14 | 6.10.9-1 | [DEBIAN-CVE-2024-47659](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47659.md) | Oct 9, 2024 |

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