Bug 2535221 (CVE-2026-89877)

Summary:	CVE-2026-89877 kernel: media: saa7164: fix cleanup on resource allocation failure
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:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 saa7164 media driver in the Linux kernel. When the `saa7164_dev_setup()` function fails to allocate PCI BAR memory regions, it incorrectly leaves a dangling entry on the global device list. This improper cleanup of resources can lead to a resource leak, potentially allowing a local attacker to cause a Denial of Service (DoS) by exhausting system resources.	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 2026-09-16 11:37:22 UTC

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

media: saa7164: fix cleanup on resource allocation failure

saa7164_dev_setup() adds the device to the global saa7164_devlist before
requesting the PCI BAR memory regions.

If get_resources() fails, saa7164_dev_setup() decrements the device count
and returns an error, but leaves the device on saa7164_devlist. The probe
error path then frees the device, leaving a dangling entry on the global
list.

Reuse the existing MMIO mapping error path to remove the device from
saa7164_devlist and decrement the device count before returning.

Also release BAR0 if it was successfully requested but the BAR2 request
fails.

Comment 1 Mauro Matteo Cascella 2026-09-22 11:35:13 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89877.mbox