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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-23270 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks As Paolo said earlier [1]: "Since the blamed commit below, classify can return TC_ACT_CONSUMED while the current skb being held by the defragmentation engine. As reported by GangMin Kim, if such packet is that may cause a UaF when the defrag engine later on tries to tuch again such packet." act_ct was never meant to be used in the egress path, however some users are attaching it to egress today [2]. Attempting to reach a middle ground, we noticed that, while most qdiscs are not handling TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we address the issue by only allowing act_ct to bind to clsact/ingress qdiscs and shared blocks. That way it's still possible to attach act_ct to egress (albeit only with clsact). [1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/ [2] https://lore.kernel.org/netdev/[email protected]/


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/11cb63b0d1a0685e0831ae3c77223e002ef18189 kernel.org Patch 
https://git.kernel.org/stable/c/380ad8b7c65ea7aa10ef2258297079ed5ac1f5b6 kernel.org Patch 
https://git.kernel.org/stable/c/524ce8b4ea8f64900b6c52b6a28df74f6bc0801e kernel.org Patch 
https://git.kernel.org/stable/c/5a110ddcc99bda77a28598b3555fe009eaab3828 kernel.org Patch 
https://git.kernel.org/stable/c/9deda0fcda5c1f388c5e279541850b71a2ccfcf4 kernel.org Patch 
https://git.kernel.org/stable/c/bc4e5bb529823a09f02dbe96169de679a9db26e0 kernel.org Patch 
https://git.kernel.org/stable/c/fb3c380a54e33d1fd272cc342faa906d787d7ef1 kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST  

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-23270
NVD Published Date:
03/18/2026
NVD Last Modified:
05/22/2026
Source:
kernel.org