CVE-2026-23263: io_uring/zcrx: fix page array leak

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-18 · updated 2026-06-17
Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix page array leak d9f595b9a65e ("io_uring/zcrx: fix leaking pages on sg init fail") fixed a page leakage but didn't free the page array, release it as well.

Affected products

Linux kernel: from 6.17 before 6.18.10; 6.19-rc1, 6.19-rc2, 6.19-rc3, 6.19-rc4, 6.19-rc5, 6.19-rc6 (+2) — fixed in 6.18.10

How to fix

Upgrade to a fixed version: Linux kernel 6.18.10. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/0ae91d8ab70922fb74c22c20bedcb69459579b1c
https://git.kernel.org/stable/c/64cf3016234ce8a6e4195ed1b2d9e2a1ae41b57d

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