Bug 2125879 (CVE-2022-3170)

Summary:	CVE-2022-3170 kernel: ALSA: control: out-of-bounds access in get_ctl_id_hash()
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bhu, brdeoliv, bskeggs, ddepaula, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, hpa, jarod, jarodwilson, jfaracco, jferlan, jforbes, jglisse, joe.lawrence, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, rvrbovsk, scweaver, steved, walters
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 6.0-rc4	Doc Type:	---
Doc Text:	An out-of-bounds access issue was found in the Linux kernel sound subsystem. It could occur when the 'id->name' provided by the user did not end with '\0'. A privileged local user could pass a specially crafted name through ioctl() interface and crash the system or potentially escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-09-11 13:43:27 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:
Bug Blocks:	2121805

Description Mauro Matteo Cascella 2022-09-11 13:31:33 UTC

Since the user can control the arguments provided to the kernel by the ioctl() system call, an out-of-bounds bug occurs when the 'id->name' provided by the user does not end with '\0'.

Upstream commits:
https://github.com/torvalds/linux/commit/6ab55ec0a938c7f943a4edba3d6514f775983887
https://github.com/torvalds/linux/commit/5934d9a0383619c14df91af8fd76261dc3de2f5f

Comment 1 Mauro Matteo Cascella 2022-09-11 13:43:27 UTC

Red Hat Enterprise Linux 6, 7, 8 and 9 are not affected by this flaw as they did not include support for faster lookup of control elements (upstream commit that introduced the bug): https://github.com/torvalds/linux/commit/c27e1ef.