Bug 2063228 (CVE-2021-39698)

Summary:	CVE-2021-39698 kernel: use-after-free in the file polling implementation
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, aquini, bdettelb, bhu, chwhite, crwood, dbohanno, dvlasenk, esandeen, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jfaracco, jforbes, jglisse, jlelli, jmoyer, joe.lawrence, jonathan, josef, jpoimboe, jshortt, jstancek, jthierry, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, kpatch-maint-bot, lgoncalv, linville, lzampier, masami256, mchehab, michal.skrivanek, mperina, nmurray, nobody, ptalbert, qzhao, rhandlin, rkeshri, rvrbovsk, scweaver, steved, vkumar, walters, williams, xzhou, ycote, zulinx86
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.16 rc5	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel’s file polling implementation in kernel/sched/wait.c., which leads to a use-after-free problem. This flaw allows a local user to cause a denial of service (memory corruption or crash) or privilege escalation.	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:	2063229, 2063627, 2063628, 2063629, 2063630, 2063631, 2063632, 2063633, 2063634, 2063635, 2063636, 2063637, 2063638, 2063639, 2063640, 2063641, 2063642, 2063643, 2063644, 2063645, 2063646, 2063647, 2063648, 2063649, 2063650, 2063651, 2063652, 2063653, 2063654, 2063655, 2063656, 2063657, 2063658, 2063694, 2063695, 2065566
Bug Blocks:	2063231

Description Guilherme de Almeida Suckevicz 2022-03-11 14:42:01 UTC

A vulnerability was found in the file polling implementation, which could lead to a use-after-free. A local user could exploit this for denial of service (memory corruption or crash) or possibly for privilege escalation.

References and upstream patches:
https://source.android.com/security/bulletin/2022-03-01
https://android.googlesource.com/kernel/common/+/42288cb44c4b
https://android.googlesource.com/kernel/common/+/a880b28a71e3
https://android.googlesource.com/kernel/common/+/9537bae0da1f
https://android.googlesource.com/kernel/common/+/363bee27e258
https://android.googlesource.com/kernel/common/+/50252e4b5e98

Comment 1 Guilherme de Almeida Suckevicz 2022-03-11 14:43:00 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2063229]

Comment 2 Justin M. Forbes 2022-03-11 16:54:19 UTC

This was fixed for Fedora with the 5.15.8 stable kernel update.

Comment 20 Sandro Bonazzola 2022-03-18 08:34:28 UTC

Created kernel tracking bugs for this issue:

Affects: ovirt-4.4 [bug 2065566]

Comment 31 Rohit Keshri 2022-04-05 13:57:15 UTC

There was no shipped kernel version that was seen affected by this problem.