Bug 1403747 (CVE-2016-7912)

Summary:	CVE-2016-7912 kernel: media: use-after-free in USB gadget driver
Product:	[Other] Security Response	Reporter:	Vladis Dronov <vdronov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, bhu, dhoward, fhrbata, gansalmon, iboverma, ichavero, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, madhu.chinakonda, mchehab, mcressma, nmurray, pholasek, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Use-after-free vulnerability in the ffs_user_copy_worker function in drivers/usb/gadget/function/f_fs.c in the Linux kernel before 4.5.3 allows local users to gain privileges by accessing an I/O data structure after a certain callback call. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 10:51:49 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1403752
Bug Blocks:	1395250

Description Vladis Dronov 2016-12-12 10:22:38 UTC

Use-after-free vulnerability in the ffs_user_copy_worker function in drivers/usb/gadget/function/f_fs.c in the Linux kernel before 4.5.3 allows local users to gain privileges by accessing an I/O data structure after a certain callback call. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

References:

https://source.android.com/security/bulletin/2016-11-01.html#eop-in-kernel-usb-driver

https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7912

Patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=38740a5b87d53ceb89eb2c970150f6e94e00373a

Comment 4 Vladis Dronov 2016-12-12 10:33:08 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG-2 as the code with the flaw is not present in the products listed.