Vulnerability · Published Aug 5, 2026 · Assigned by redhat
CVE-2026-71226Libkcapi: memory corruption via uncanceled aio requests on error in libkcapi's one-shot aio path
High 7.3
In plain English
A high-severity use-after-free in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.1%top 96.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | libkcapi | 1.5.1-1.el10_2 | ALSA-2026:67267 |
| AlmaLinux:8 | libkcapi | 1.4.0-3.el8_10 | ALSA-2026:67266 |
| AlmaLinux:9 | libkcapi | 1.4.0-3.el9_8 | ALSA-2026:67265 |
| AlmaLinux:10 | libkcapi-hasher | 1.5.1-1.el10_2 | ALSA-2026:67267 |
| AlmaLinux:10 | libkcapi-hmaccalc | 1.5.1-1.el10_2 | ALSA-2026:67267 |
| AlmaLinux:8 | libkcapi-hmaccalc | 1.4.0-3.el8_10 | ALSA-2026:67266 |
| AlmaLinux:9 | libkcapi-hmaccalc | 1.4.0-3.el9_8 | ALSA-2026:67265 |
| Alpine:v3.21 | libkcapi | 1.5.1-r0 | ALPINE-CVE-2026-71226 |
| Alpine:v3.22 | libkcapi | 1.5.1-r0 | ALPINE-CVE-2026-71226 |
| Alpine:v3.23 | libkcapi | 1.5.1-r0 | ALPINE-CVE-2026-71226 |
| Alpine:v3.24 | libkcapi | 1.5.1-r0 | ALPINE-CVE-2026-71226 |
| Debian:12 | libkcapi | no fix listed | DEBIAN-CVE-2026-71226 |
| Debian:13 | libkcapi | no fix listed | DEBIAN-CVE-2026-71226 |
| Debian:14 | libkcapi | 1.5.1-1 | DEBIAN-CVE-2026-71226 |
| Rocky Linux:10 | libkcapi | 0:1.5.1-1.el10_2 | RLSA-2026:67267 |
| Rocky Linux:8 | libkcapi | 0:1.4.0-3.el8_10 | RLSA-2026:67266 |
| Rocky Linux:9 | libkcapi | 0:1.4.0-3.el9_8 | RLSA-2026:67265 |
| Ubuntu:22.04:LTS | libkcapi | no fix listed | UBUNTU-CVE-2026-71226 |
| Ubuntu:24.04:LTS | libkcapi | no fix listed | UBUNTU-CVE-2026-71226 |
| Ubuntu:26.04:LTS | libkcapi | no fix listed | UBUNTU-CVE-2026-71226 |
| Ubuntu:26.10 | libkcapi | no fix listed | UBUNTU-CVE-2026-71226 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Stephan Muelle | libkcapi | 0.12.0 – before 1.5.1 |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | see references |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | see references |
| Red Hat | Red Hat Hardened Images | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 5 | see references |
Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
References
- RHSA-2026:56985 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:67265 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:67266 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:67267 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:69285 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:87712 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:93453 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-71226 vdb-entry, x_refsource_REDHAT
- RHBZ#2462114 issue-tracking, x_refsource_REDHAT