SB20260912367 - Improper Check for Unusual or Exceptional Conditions in Linux kernel io_uring

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-81010)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause incorrect waitid request handling.

The vulnerability exists due to improper handling of cancellation in the io_uring waitid callback when canceled task work is executed through the fallback task_work path. A local user can submit a waitid request to cause incorrect waitid request handling.

The fallback path runs from a kworker rather than the task that submitted the request.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/14572de82e5022899e5856008bc9cac97004a88c
• https://git.kernel.org/stable/c/7bc98e2de8c58a2bfaf0f540eb096a386ecfc96c