Bug 2439847 (CVE-2026-23135)

Summary:	CVE-2026-23135 kernel: Kernel: Denial of Service in ath12k wifi driver due to incorrect dma_free_coherent() pointer
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
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's ath12k wifi driver. A local attacker could exploit this vulnerability by triggering the device driver teardown path. The driver incorrectly passes aligned memory addresses to dma_free_coherent() instead of the original unaligned addresses during cleanup. This improper memory deallocation can lead to memory leaks, data corruption, or kernel crashes, ultimately resulting in a denial of service.	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 2026-02-14 16:01:31 UTC

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

wifi: ath12k: fix dma_free_coherent() pointer

dma_alloc_coherent() allocates a DMA mapped buffer and stores the
addresses in XXX_unaligned fields.  Those should be reused when freeing
the buffer rather than the aligned addresses.

Comment 1 Alexander B 2026-02-16 09:07:23 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021438-CVE-2026-23135-74c1@gregkh/T