Bug 1810685 (CVE-2020-9383)

Summary:	CVE-2020-9383 kernel: out-of-bounds read in set_fdc in drivers/block/floppy.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, airlied, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, rkeshri, rt-maint, rvrbovsk, steved, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An out-of-bounds (OOB) memory access flaw was found in the floppy driver module in the Linux kernel. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-05-12 16:32:16 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:	1810687, 1815403, 1815404, 1815405, 1888662
Bug Blocks:	1810689

Description Guilherme de Almeida Suckevicz 2020-03-05 18:01:18 UTC

An out of bounds (OOB) memory access flaw was found in set_fdc in drivers/block/floppy.c in floppy driver module . This could allow a local attacker to crash the system or leak kernel internal information.


Reference and upstream commit:
https://github.com/torvalds/linux/commit/2e90ca68b0d2f5548804f22f0dd61145516171e3

Comment 1 Guilherme de Almeida Suckevicz 2020-03-05 18:03:44 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1810687]

Comment 2 Justin M. Forbes 2020-03-05 21:05:20 UTC

This was fixed for Fedora with the 5.5.7 stable kernel updates.

Comment 8 Rohit Keshri 2020-03-30 11:08:19 UTC

Mitigation:

Mitigation for this issue is to skip loading the affected floppy driver module onto the system till we have a fix available, this can be done by a blacklist mechanism, this will ensure the driver is not loaded at the boot time.
~~~
How do I blacklist a kernel module to prevent it from loading automatically?
https://access.redhat.com/solutions/41278 
~~~

Comment 9 errata-xmlrpc 2020-05-12 15:12:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:2104 https://access.redhat.com/errata/RHSA-2020:2104

Comment 10 Product Security DevOps Team 2020-05-12 16:32:16 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-9383

Comment 11 errata-xmlrpc 2020-09-29 18:59:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4062 https://access.redhat.com/errata/RHSA-2020:4062

Comment 12 errata-xmlrpc 2020-09-29 20:53:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4060 https://access.redhat.com/errata/RHSA-2020:4060