Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-05T12:22:09 libkcapi: Memory corruption via uncanceled AIO requests on error in libkcapi's one-shot AIO path 7.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H CWE-416

Memory Corruption via Uncanceled AIO Requests on Error: libkcapi's one-shot AIO path can return an error before all submitted IOCBs are drained, allowing later kernel writes into caller-owned output buffers.

Memory Corruption via Uncanceled AIO Requests on Error: libkcapi's one-shot AIO path can return an error before all submitted IOCBs are drained, allowing later kernel writes into caller-owned output buffers.

This Moderate impact flaw in libkcapi affects applications utilizing the one-shot Asynchronous I/O (AIO) interfaces with the `KCAPI_INIT_AIO` flag. Exploitation requires an error to occur after submitting I/O Control Blocks (IOCBs), followed by the application freeing or reusing output buffers before all kernel completions are processed. This vulnerability does not affect default configurations as it relies on an opt-in AIO setup. This issue was discovered by Found by AISLE in partnership with Red Hat. To mitigate this issue, applications should avoid initializing libkcapi handles with the `KCAPI_INIT_AIO` flag, preferring synchronous interfaces instead. If the real AIO path must be enabled, applications must ensure that `outiov` buffers are not immediately freed or reused after an error return, allowing all kernel completions to finish. This operational control prevents delayed kernel writes into potentially reallocated or freed memory. Red Hat Enterprise Linux 10 Affected libkcapi Red Hat Enterprise Linux 8 Affected libkcapi Red Hat Enterprise Linux 9 Affected libkcapi Red Hat Hardened Images Affected libkcapi Red Hat OpenShift Container Platform 4 Affected rhcos https://www.cve.org/CVERecord?id=CVE-2026-71226 https://nvd.nist.gov/vuln/detail/CVE-2026-71226