CVE-2023-52926: io_uring/rw: split io_read() into a helper

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-24 · updated 2026-06-17
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: IORING_OP_READ did not correctly consume the provided buffer list when read i/o returned < 0 (except for -EAGAIN and -EIOCBQUEUED return). This can lead to a potential use-after-free when the completion via io_rw_done runs at separate context.

Affected products

Linux kernel: from 5.1 before 6.1.122; from 6.2 before 6.6.68 — fixed in 6.1.122, 6.6.68

How to fix

Upgrade to a fixed version: Linux kernel 6.1.122, 6.6.68. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/6c27fc6a783c8a77c756dd5461b15e465020d075
https://git.kernel.org/stable/c/72060434a14caea20925e492310d6e680e3f9007
https://git.kernel.org/stable/c/a08d195b586a217d76b42062f88f375a3eedda4d
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

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