CVE-2026-71227
Fixed in a distro release EPSS <1%CVSS 5.1
A flaw was found in libkcapi. A local attacker can influence an application that uses the Asynchronous Input/Output (AIO) interface. By reusing an AIO-enabled handle after a prior completion error, the _kcapi_aio_read_all() function can enter a non-terminating wait loop. This can lead to a persistent denial of service, making the affected application or thread unresponsive.
Products: Stephan Muelle libkcapi, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat Hardened Images, Red Hat OpenShift Container Platform 4
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | libkcapi | 1.5.1-1.el10_2 |
| AlmaLinux 10 | libkcapi-hasher | 1.5.1-1.el10_2 |
| AlmaLinux 10 | libkcapi-hmaccalc | 1.5.1-1.el10_2 |
| AlmaLinux 8 | libkcapi | 1.4.0-3.el8_10 |
| AlmaLinux 8 | libkcapi-hmaccalc | 1.4.0-3.el8_10 |
| AlmaLinux 9 | libkcapi | 1.4.0-3.el9_8 |
| AlmaLinux 9 | libkcapi-hmaccalc | 1.4.0-3.el9_8 |
| Alpine 3.21 | libkcapi | 1.5.1-r0 |
| Alpine 3.22 | libkcapi | 1.5.1-r0 |
| Alpine 3.23 | libkcapi | 1.5.1-r0 |
| Alpine 3.24 | libkcapi | 1.5.1-r0 |
| Debian 12 | libkcapi | no fix |
| Debian 13 | libkcapi | no fix |
| Debian 14 | libkcapi | 1.5.1-1 |
| Red Hat Enterprise Linux 10.2 | libkcapi | 0:1.5.1-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | libkcapi-debuginfo | 0:1.5.1-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | libkcapi-debugsource | 0:1.5.1-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | libkcapi-hasher | 0:1.5.1-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | libkcapi-hasher-debuginfo | 0:1.5.1-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | libkcapi-hmaccalc | 0:1.5.1-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | libkcapi-tests-debuginfo | 0:1.5.1-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | libkcapi-tools-debuginfo | 0:1.5.1-1.el10_2 |
| Red Hat Enterprise Linux 8 | libkcapi | 0:1.4.0-3.el8_10 |
| Red Hat Enterprise Linux 8 | libkcapi-debuginfo | 0:1.4.0-3.el8_10 |
| Red Hat Enterprise Linux 8 | libkcapi-debugsource | 0:1.4.0-3.el8_10 |
| Red Hat Enterprise Linux 8 | libkcapi-hmaccalc | 0:1.4.0-3.el8_10 |
| Red Hat Enterprise Linux 8 | libkcapi-hmaccalc-debuginfo | 0:1.4.0-3.el8_10 |
| Red Hat Enterprise Linux 8 | libkcapi-tests-debuginfo | 0:1.4.0-3.el8_10 |
| Red Hat Enterprise Linux 8 | libkcapi-tools-debuginfo | 0:1.4.0-3.el8_10 |
| Red Hat Enterprise Linux 9 | libkcapi | 0:1.4.0-3.el9_8 |
| Red Hat Enterprise Linux 9 | libkcapi-debuginfo | 0:1.4.0-3.el9_8 |
| Red Hat Enterprise Linux 9 | libkcapi-debugsource | 0:1.4.0-3.el9_8 |
| Red Hat Enterprise Linux 9 | libkcapi-fipscheck-debuginfo | 0:1.4.0-3.el9_8 |
| Red Hat Enterprise Linux 9 | libkcapi-hmaccalc | 0:1.4.0-3.el9_8 |
| Red Hat Enterprise Linux 9 | libkcapi-hmaccalc-debuginfo | 0:1.4.0-3.el9_8 |
| Red Hat Enterprise Linux 9 | libkcapi-tests-debuginfo | 0:1.4.0-3.el9_8 |
| Red Hat Enterprise Linux 9 | libkcapi-tools-debuginfo | 0:1.4.0-3.el9_8 |
| Red Hat Enterprise Linux eus 10.0 | libkcapi | 0:1.5.0-6.el10_0 |
| Red Hat hummingbird 1 | libkcapi | 0:1.5.1-0.1.hum1 |
| Red Hat hummingbird 1 | libkcapi-devel | 0:1.5.1-0.1.hum1 |
| Red Hat hummingbird 1 | libkcapi-fipscheck | 0:1.5.1-0.1.hum1 |
| Red Hat hummingbird 1 | libkcapi-hasher | 0:1.5.1-0.1.hum1 |
| Red Hat hummingbird 1 | libkcapi-hmaccalc | 0:1.5.1-0.1.hum1 |
| Red Hat hummingbird 1 | libkcapi-static | 0:1.5.1-0.1.hum1 |
| Red Hat hummingbird 1 | libkcapi-tests | 0:1.5.1-0.1.hum1 |
| Red Hat hummingbird 1 | libkcapi-tools | 0:1.5.1-0.1.hum1 |
| Rocky Linux 10 | libkcapi | 0:1.5.1-1.el10_2 |
| Rocky Linux 8 | libkcapi | 0:1.4.0-3.el8_10 |
| Rocky Linux 9 | libkcapi | 0:1.4.0-3.el9_8 |
| Ubuntu 18.04 LTS | libkcapi | no fix |
| Ubuntu 20.04 LTS | libkcapi | no fix |
| Ubuntu 22.04 LTS | libkcapi | no fix |
| Ubuntu 24.04 LTS | libkcapi | no fix |
| Ubuntu 26.04 LTS | libkcapi | no fix |
| Ubuntu 26.10 | libkcapi | no fix |
| Ubuntu Pro FIPS-preview 22.04 LTS | libkcapi | no fix |
| Ubuntu Pro FIPS-updates 16.04 LTS | libkcapi | no fix |
| Ubuntu Pro FIPS-updates 18.04 LTS | libkcapi | no fix |
| Ubuntu Pro FIPS-updates 20.04 LTS | libkcapi | no fix |
| Ubuntu Pro FIPS-updates 22.04 LTS | libkcapi | no fix |
| Ubuntu Pro FIPS 16.04 LTS | libkcapi | no fix |
| Ubuntu Pro FIPS 18.04 LTS | libkcapi | no fix |
| Ubuntu Pro FIPS 20.04 LTS | libkcapi | no fix |