Memory corruption via undrained AIO completions
Published Aug 5, 2026 · Updated Aug 5, 2026
Use-after-free in Red Hat libkcapi's one-shot AIO path allows local users to corrupt application memory through an error return. The path returns before every submitted I/O control block is drained, so delayed kernel completions write into caller-owned output buffers after the application frees or reuses them. Reachability requires an application to opt into KCAPI_INIT_AIO, encounter an error after submission, and release or recycle the buffer before completion; default configurations are unaffected.
Summary
What happened
Use-after-free in Red Hat libkcapi's one-shot AIO path allows local users to corrupt application memory through an error return. The path returns before every submitted I/O control block is drained, so delayed kernel completions write into caller-owned output buffers after the application frees or reuses them. Reachability requires an application to opt into KCAPI_INIT_AIO, encounter an error after submission, and release or recycle the buffer before completion; default configurations are unaffected.
The record
- CVE
- CVE-2026-71226
- Published
- Aug 5, 2026
- Updated
- Aug 5, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 10
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 5, 2026CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo