Bug 2256786 (CVE-2023-6270, ZDI-CAN-22236)

Summary:	CVE-2023-6270 kernel: AoE: improper reference count leads to use-after-free vulnerability
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, bhu, carnil, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, tglozar, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the ATA over Ethernet (AoE) driver in the Linux kernel. The aoecmd_cfg_pkts() function improperly updates the refcnt on `struct net_device`, and a use-after-free can be triggered by racing between the free on the struct and the access through the `skbtxq` global queue. This could lead to a denial of service condition or potential code execution.	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:
Bug Depends On:	2256787
Bug Blocks:	2256791

Description Mauro Matteo Cascella 2024-01-04 14:46:47 UTC

A flaw was found in the ATA over Ethernet (AoE) driver in the Linux kernel. The aoecmd_cfg_pkts() improperly updates the refcnt on `struct net_device`, and a use-after-free can be triggered by racing between the free on the struct and the access through the `skbtxq` global queue.

ZDI security advisory (possibly yet to be published):
https://www.zerodayinitiative.com/advisories/ZDI-CAN-22236/

Comment 1 Mauro Matteo Cascella 2024-01-04 14:47:34 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2256787]

Comment 5 Salvatore Bonaccorso 2024-01-04 20:37:26 UTC

Is this handled upstream? Do you by chance have a reference to the upstream proposed fix?

To the best of my knowledge, there is no recent commit in drivers/block/aoe/ area upstream in mainline which might go in that direction.

Comment 6 Mauro Matteo Cascella 2024-01-05 08:01:04 UTC

In reply to comment #5:
> Is this handled upstream? Do you by chance have a reference to the upstream
> proposed fix?

We've got this from ZDI, the Linux kernel security team (security) should be aware of this bug too.

> To the best of my knowledge, there is no recent commit in drivers/block/aoe/
> area upstream in mainline which might go in that direction.

I couldn't find any relevant upstream discussion or commit either, hopefully ZDI will publish their advisory soon and we'll get more information there.