Bug 2039914 (CVE-2021-45486)

Summary:	CVE-2021-45486 kernel: information leak in the IPv4 implementation
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, adscvr, airlied, alciregi, bhu, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jfaracco, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rkeshri, rvrbovsk, scweaver, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.13-rc1	Doc Type:	If docs needed, set a value
Doc Text:	An information leak flaw was found in the Linux kernel’s IPv4 implementation in the ip_rt_init in net/ipv4/route.c function. The use of a small hash table in IP ID generation allows a remote attacker to reveal sensitive information.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-11 14:46:54 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:	2039915, 2039969, 2039970, 2126329, 2126330
Bug Blocks:	2039917

Description Guilherme de Almeida Suckevicz 2022-01-12 17:44:00 UTC

An information leak problem could be observed in ip_rt_init in net/ipv4/route.c in the IPv4 implementation. In this flaw, using a small hash table in IP ID generation could be abused by a patient remote attacker to reveal sensitive information.

Reference and upstream patch:
https://arxiv.org/pdf/2112.09604.pdf
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/route.c?id=aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba

Comment 1 Guilherme de Almeida Suckevicz 2022-01-12 17:44:59 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2039915]

Comment 6 Justin M. Forbes 2022-01-14 15:44:17 UTC

This was fixed for Fedora with the 5.12.4 stable kernel updates.

Comment 10 errata-xmlrpc 2022-05-10 14:40:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1975 https://access.redhat.com/errata/RHSA-2022:1975

Comment 11 errata-xmlrpc 2022-05-10 14:47:07 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1988 https://access.redhat.com/errata/RHSA-2022:1988

Comment 12 Product Security DevOps Team 2022-05-11 14:46:51 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-2021-45486

Comment 15 errata-xmlrpc 2022-10-18 08:04:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Extended Update Support

Via RHSA-2022:6991 https://access.redhat.com/errata/RHSA-2022:6991

Comment 16 errata-xmlrpc 2022-10-18 08:14:38 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Extended Update Support

Via RHSA-2022:6983 https://access.redhat.com/errata/RHSA-2022:6983