Bug 2048259 (CVE-2022-0433)

Summary:	CVE-2022-0433 kernel: missing initialization in bloom filter map in kernel/bpf/bloom_filter.c can lead to DoS
Product:	[Other] Security Response	Reporter:	Alex <allarkin>
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, bdettelb, bhu, brdeoliv, bskeggs, chwhite, crwood, dfreiber, dhoward, doconnor, drow, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jfaracco, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, scweaver, steved, teagle, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Linux kernel 5.17-rc1	Doc Type:	If docs needed, set a value
Doc Text:	A NULL pointer dereference flaw was found in the Linux kernel’s BPF subsystem in the way a user triggers the map_get_next_key function of the BPF bloom filter. This flaw allows a local user to crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-01-31 14:01:16 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:	2048262
Bug Blocks:	2039891, 2048649

Description Alex 2022-01-30 16:50:51 UTC

The bug inside bloom filter.
Results in Null Pointer Dereference when map_get_next_key function inside BPF code being executed by local user.

This is new (fresh) bloom filter functionality of the eBPF that is actual starting from this commit:
https://lore.kernel.org/bpf/20210921210225.4095056-2-joannekoong@fb.com/

Reference to the patch:
https://lore.kernel.org/bpf/d5776f5d-3416-4e3b-8751-8a5a9e6a0d4d@iogearbox.net/T/

Comment 1 Alex 2022-01-30 17:06:29 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2048262]

Comment 3 juneau 2022-01-31 13:34:03 UTC

Services notaffected per kernel analysis.

Comment 5 Justin M. Forbes 2022-01-31 22:53:46 UTC

This bug was introduced in 5.16 kernels and a fix was included in 5.16.3 upstream. It was never shipped as an update to stable Fedora users.