CVE-2026-43074
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eventpoll Use-After-Free in Linux Kernel

Publication date: 2026-05-06

Last updated on: 2026-05-06

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-06
Generated
2026-05-07
AI Q&A
2026-05-06
EPSS Evaluated
N/A
NVD
CVE-2026-43074
EUVD
EUVD-2026-27558
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability exists in the Linux kernel's eventpoll subsystem. Specifically, the function ep_free() in eventpoll.c may free (kfree) the eventpoll structure (epi->ep) while it is still being accessed by another concurrent thread. This leads to a use-after-free (UAF) condition. The fix defers the freeing of this structure to an RCU (Read-Copy-Update) grace period callback, ensuring the structure is not freed while still in use.


How can this vulnerability impact me? :

The use-after-free vulnerability can lead to undefined behavior including potential system crashes, data corruption, or exploitation by attackers to execute arbitrary code or escalate privileges. Since the eventpoll structure may be accessed concurrently, freeing it prematurely can destabilize the kernel and compromise system security.


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