Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Linux Linux — smack: tcp: ipv4, fix incorrect labeling
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L L N U H H H 8.8 .0078 53.2 —
AFFECTED
Product Versions Fixed
Linux 07feee8f812f7327a46186f7604df312c8c81962 – —
Linux 2.6.30 – 4.19.322
TIMELINE
Sep 30 Reserved by Linux
Oct 9 Published (CNA: Linux)
Aug 4 RESCORED — CVE-2024-47659 (Linux). CVSS 9.1 → 8.8 (NVD).
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
| September 30, 2024 | Reserved | Reserved by Linux |
| October 9, 2024 | Published | Published (CNA: Linux) |
| August 4, 2026 | RESCORED | RESCORED — CVE-2024-47659 (Linux). CVSS 9.1 → 8.8 (NVD). |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
| Linux | Linux | — | 07feee8f812f7327a46186f7604df312c8c81962 | — |
| Linux | Linux | — | 2.6.30 | 4.19.322 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2024-47659 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.