Bug 1224097 (CVE-2024-27394)

Summary:	VUL-0: CVE-2024-27394: kernel: tcp: Fix Use-After-Free in tcp_ao_connect_init
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	gabriel.bertazi, gianluca.gabrielli
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/404883/
Whiteboard:
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-05-10 06:57:12 UTC

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

tcp: Fix Use-After-Free in tcp_ao_connect_init

Since call_rcu, which is called in the hlist_for_each_entry_rcu traversal
of tcp_ao_connect_init, is not part of the RCU read critical section, it
is possible that the RCU grace period will pass during the traversal and
the key will be free.

To prevent this, it should be changed to hlist_for_each_entry_safe.

The Linux kernel CVE team has assigned CVE-2024-27394 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.7 with commit 7c2ffaf21bd6 and fixed in 6.8.9 with commit ca4fb6c6764b
	Issue introduced in 6.7 with commit 7c2ffaf21bd6 and fixed in 6.9-rc6 with commit 80e679b352c3

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-27394
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/ipv4/tcp_ao.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/ca4fb6c6764b3f75b4f5aa81db1536291897ff7f
	https://git.kernel.org/stable/c/80e679b352c3ce5158f3f778cfb77eb767e586fb

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-27394
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-27394.mbox
https://git.kernel.org/stable/c/ca4fb6c6764b3f75b4f5aa81db1536291897ff7f
https://git.kernel.org/stable/c/80e679b352c3ce5158f3f778cfb77eb767e586fb

Comment 1 Gabriel Krisman Bertazi 2024-05-10 17:03:24 UTC

The issue was introduced in 6.7 and never backported to our kernels.  It seems we don't need to do anything else here. Back to the security team.

scripts/check-kernel-fix -v -s 5.5 -r CVE-2024-27394
80e679b352c3 ("tcp: Fix Use-After-Free in tcp_ao_connect_init") merged v6.9-rc6~27^2~22
Fixes: 7c2ffaf21bd6 ("net/tcp: Calculate TCP-AO traffic keys") merged v6.7-rc1~160^2~18^2~18
Security fix for CVE-2024-27394 bsc#1224097 with CVSS 5.5
Experts candidates: mkubecek@suse.cz denis.kirjanov@suse.com davide.benini@suse.com
SLE15-SP6-AZURE-GA:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP6-GA:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP6-AZURE:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP6:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP6-RT:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP6-RT-GA:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
ALP-current-GA:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
ALP-current:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
ALP-current-RT:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
ALP-current-RT-GA:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP5-AZURE:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP5:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP5-RT:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP4-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP4-RT-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP3-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP3-RT-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP2-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP2-EB:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP2-EB-carwos1:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE15-SP2-EB-carwos1-1:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE12-SP5-AZURE:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE12-SP5:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE12-SP5-RT:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE12-SP3-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE12-SP3-TD:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
SLE11-SP4-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
cve/linux-4.4-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
cve/linux-5.3-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope
cve/linux-5.14-LTSS:80e679b352c3ce5158f3f778cfb77eb767e586fb:nope

ACTION NEEDED!
SLE15-SP6: NOPE: no problema for 80e679b352c3ce5158f3f778cfb77eb767e586fb
SLE15-SP5: NOPE: no problema for 80e679b352c3ce5158f3f778cfb77eb767e586fb
SLE12-SP5: NOPE: no problema for 80e679b352c3ce5158f3f778cfb77eb767e586fb
SLE12-SP3-TD: NOPE: no problema for 80e679b352c3ce5158f3f778cfb77eb767e586fb

Comment 2 Gabriele Sonnu 2024-06-10 12:52:16 UTC

All done, closing.