CVE-2026-45995
Analyzed Analyzed - Analysis Complete
Use-After-Free in Linux Kernel io_uring/zcrx

Publication date: 2026-05-27

Last updated on: 2026-06-16

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix user_struct uaf io_free_rbuf_ring() usees a struct user_struct, which io_zcrx_ifq_free() puts it down before destroying the ring.
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Meta Information
Published
2026-05-27
Last Modified
2026-06-16
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-45995
EUVD
EUVD-2026-32291
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel From 6.19 (inc) to 7.0.4 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability is a use-after-free (UAF) issue in the Linux kernel related to the io_uring subsystem, specifically in the zcrx component. The problem occurs because the function io_free_rbuf_ring() uses a struct user_struct, but the function io_zcrx_ifq_free() releases (puts down) this struct before the ring is destroyed, leading to a use-after-free condition.

Impact Analysis

This vulnerability involves a use-after-free (UAF) issue in the Linux kernel's io_uring subsystem related to the user_struct structure. Exploiting this vulnerability could potentially lead to memory corruption, which might allow an attacker to cause a system crash, escalate privileges, or execute arbitrary code within the kernel context.

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