Bug 2425192 (CVE-2022-50742)

Summary: CVE-2022-50742 kernel: Linux kernel: Denial of Service via refcount leak in ocxl afu_ioctl()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's `misc: ocxl` component. A local attacker with low privileges could exploit a reference count leak in the `afu_ioctl()` function. This flaw occurs when `ocxl_irq_set_handler` fails to call `eventfd_ctx_put` to release a reference count obtained by `eventfd_ctx_fdget`. This could lead to a denial of service (DoS) due to resource exhaustion.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-12-24 14:09:49 UTC 
In the Linux kernel, the following vulnerability has been resolved:

misc: ocxl: fix possible refcount leak in afu_ioctl()

eventfd_ctx_put need to be called to put the refcount that gotten by
eventfd_ctx_fdget when ocxl_irq_set_handler fails.
Comment 1 Alexander B 2025-12-24 19:44:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122449-CVE-2022-50742-e130@gregkh/T