CVE-2026-23245
Use-After-Free Vulnerability in Linux Kernel net/sched act_gate
Publication date: 2026-03-18
Last updated on: 2026-05-21
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | 5.8 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | From 6.2 (inc) to 6.6.130 (exc) |
| linux | linux_kernel | From 6.7 (inc) to 6.12.78 (exc) |
| linux | linux_kernel | From 6.13 (inc) to 6.18.18 (exc) |
| linux | linux_kernel | From 6.19 (inc) to 6.19.8 (exc) |
| linux | linux_kernel | From 5.8.1 (inc) to 5.10.253 (exc) |
| linux | linux_kernel | From 5.11 (inc) to 6.1.167 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Linux kernel's network scheduler component, specifically in the act_gate module. The issue arises because the gate action can be replaced while a high-resolution timer callback or a dump path is traversing the schedule list. This can lead to inconsistencies or race conditions.
The fix involves converting the parameters to an RCU (Read-Copy-Update) protected snapshot and performing updates under a lock (tcf_lock), ensuring that the previous snapshot is freed safely using call_rcu(). Additionally, when the REPLACE operation omits the entry list, the existing schedule is preserved to maintain the effective state unchanged.
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How can this vulnerability be detected on my network or system? Can you suggest some commands?
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What immediate steps should I take to mitigate this vulnerability?
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