Bug 2525381 (CVE-2026-80667)

Summary:	CVE-2026-80667 kernel: net/mlx5: LAG, MPESW, Fix missing complete() on devcom error
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's Mellanox (mlx5) network driver, specifically within the Multi-Port Ethernet Switch (MPESW) work handling for Link Aggregation Groups (LAG). When the `mlx5_lag_get_devcom_comp()` function returns a null value, the `mlx5_mpesw_work()` function fails to call `complete()`. This oversight can cause a process waiting for the work to finish to block indefinitely, leading to a denial of service (DoS) for the affected system.	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 2026-08-28 07:42:05 UTC

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5: LAG, MPESW, Fix missing complete() on devcom error

mlx5_mpesw_work() returned without calling complete() when
mlx5_lag_get_devcom_comp() returned NULL. A caller that queued the
work and waited on mpesww->comp would block indefinitely.

Funnel the early-return path through a new "complete" label so the
waiter is always woken.

Comment 1 gkamathe 2026-08-31 07:50:04 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082847-CVE-2026-80667-0552@gregkh/T