CVE-2026-45995
io_uring/zcrx: fix user_struct uaf
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.
INFO
Published Date :
May 27, 2026, 2:17 p.m.
Last Modified :
June 17, 2026, 10:52 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Apply the patch that resolves the user_struct use-after-free issue.
- Ensure proper cleanup of ring structures after freeing buffers.
- Update the Linux kernel to the latest secure version.
Public PoC/Exploit Available at Github
CVE-2026-45995 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-45995.
| URL | Resource |
|---|---|
| https://git.kernel.org/stable/c/0fcccfd87152f957fa8312b841f6efef42a05a20 | Patch |
| https://git.kernel.org/stable/c/9feb88eeda6d288f93fcfb6bca563f89e316479d | Patch |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-45995 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-45995
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Node.js library for faster, lower-latency TCP — powered by Linux io_uring. Up to 2.5x throughput and fewer syscalls than native Node networking.
http iouring linux napi napi-rs nodejs rust tcp transport zero-copy zcrx batch high-performance networking npm queue
JavaScript Rust TypeScript
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-45995 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-45995 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5c686456a4e83ef06c74d40be05c21a0ef136684', 'lessThan': '9feb88eeda6d288f93fcfb6bca563f89e316479d', 'versionType': 'git'}, {'status': 'affected', 'version': '5c686456a4e83ef06c74d40be05c21a0ef136684', 'lessThan': '0fcccfd87152f957fa8312b841f6efef42a05a20', 'versionType': 'git'}], 'programFiles': ['io_uring/zcrx.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '7.0.4', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['io_uring/zcrx.c'], 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Jun. 16, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.4 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0fcccfd87152f957fa8312b841f6efef42a05a20 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9feb88eeda6d288f93fcfb6bca563f89e316479d Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 27, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/0fcccfd87152f957fa8312b841f6efef42a05a20 Added Reference https://git.kernel.org/stable/c/9feb88eeda6d288f93fcfb6bca563f89e316479d