SB2026040674 - Use-after-free in Linux kernel microsoft mana driver
Published: April 6, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-23454)
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in mana_hwc_destroy_channel() when tearing down hardware channels while interrupt handlers are still executing. A local attacker can trigger concurrent channel teardown and interrupt handling to cause a denial of service.
The issue is caused by a race condition where caller_ctx may be freed before the completion queue and event queue are destroyed, which can lead to a use-after-free or NULL pointer dereference in mana_hwc_handle_resp().
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/05d345719d85b927cba74afac4d5322de3aa4256
- https://git.kernel.org/stable/c/249e905571583a434d4ea8d6f92ccc0eef337115
- https://git.kernel.org/stable/c/2b001901f689021acd7bf2dceed74a1bdcaaa1f9
- https://git.kernel.org/stable/c/afdb1533eb9c05432aeb793a7280fa827c502f5c
- https://git.kernel.org/stable/c/e23bf444512cb85d76012080a76cd1f9e967448e
- https://git.kernel.org/stable/c/fa103fc8f56954a60699a29215cb713448a39e87