Bug 2516310 (CVE-2026-72495)

Summary:	CVE-2026-72495 kernel: RDMA/bnxt_re: Avoid repeated requests to allocate WC pages
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's RDMA/bnxt_re component. A local attacker could exploit this vulnerability by repeatedly requesting Work Completion (WC) pages for the same user context (ucontext), exceeding the supported limit of one page per context. This could lead to concurrent access issues and potentially result in a denial of service 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 2026-08-15 06:05:47 UTC

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

RDMA/bnxt_re: Avoid repeated requests to allocate WC pages

Applications can request multiple WC pages for the same ucontext.
As of now, only 1 WC page per ucontext is supported. Add a lock to
avoid concurrent access and a check to fail repeated requests.
Also, if the mmap entry insert fails for the WC, free the Doorbell
page index mapped for the WC page.

Comment 1 gkamathe 2026-08-19 13:48:20 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081539-CVE-2026-72495-d1ba@gregkh/T