Bug 1220689 (CVE-2021-46968)

Summary:	VUL-0: CVE-2021-46968: kernel: s390/zcrypt: fix zcard and zqueue hot-unplug memleak
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:	Minor
Priority:	P3 - Medium	CC:	andrea.mattiazzo, miroslav.franc, pmladek
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/395374/
Whiteboard:	CVSSv3.1:SUSE:CVE-2021-46968:3.3:(AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-02-29 13:51:42 UTC

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

s390/zcrypt: fix zcard and zqueue hot-unplug memleak

Tests with kvm and a kmemdebug kernel showed, that on hot unplug the
zcard and zqueue structs for the unplugged card or queue are not
properly freed because of a mismatch with get/put for the embedded
kref counter.

This fix now adjusts the handling of the kref counters. With init the
kref counter starts with 1. This initial value needs to drop to zero
with the unregister of the card or queue to trigger the release and
free the object.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-46968
https://www.cve.org/CVERecord?id=CVE-2021-46968
https://bugzilla.redhat.com/show_bug.cgi?id=2266802
https://lore.kernel.org/linux-cve-announce/2024022720-CVE-2021-46968-8c71@gregkh/T/#u

Patch:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=70fac8088cfa

Comment 1 Andrea Mattiazzo 2024-02-29 13:55:27 UTC

Closing since:
- codestreams below cve/linux-5.14 are not affected
- cve/linux-5.14, stable and SLE15-SP6 are already patched

Comment 4 Petr Mladek 2024-03-04 16:20:50 UTC

Miroslav, we need to add the reference into all still supported branches
where the patch with this commit exists. If it is in one branch only then
it is perfectly fine to update just this one branch.

Comment 5 Miroslav Franc 2024-03-05 06:37:46 UTC

(In reply to Petr Mladek from comment #4)
> Miroslav, we need to add the reference into all still supported branches
> where the patch with this commit exists. If it is in one branch only then
> it is perfectly fine to update just this one branch.

I pushed for-next with the reference update.

Comment 6 Miroslav Franc 2024-03-06 08:29:57 UTC

I updated the CVE reference in SLE15-SP3-LTSS from where it should be merged into SLE15-SP3-RT.  Reassigning back to security team.

Comment 7 Maintenance Automation 2024-03-13 08:30:26 UTC

SUSE-SU-2024:0857-1: An update that solves 67 vulnerabilities and has four security fixes can now be installed.

Category: security (important)
Bug References: 1200599, 1207653, 1212514, 1213456, 1216223, 1218195, 1218689, 1218915, 1219127, 1219128, 1219146, 1219295, 1219653, 1219827, 1219835, 1219915, 1220009, 1220140, 1220187, 1220238, 1220240, 1220241, 1220243, 1220250, 1220253, 1220255, 1220328, 1220330, 1220344, 1220398, 1220409, 1220416, 1220418, 1220421, 1220436, 1220444, 1220459, 1220469, 1220482, 1220526, 1220538, 1220570, 1220572, 1220599, 1220627, 1220641, 1220649, 1220660, 1220689, 1220700, 1220735, 1220736, 1220737, 1220742, 1220745, 1220767, 1220796, 1220825, 1220826, 1220831, 1220845, 1220860, 1220863, 1220870, 1220917, 1220918, 1220930, 1220931, 1220932, 1221039, 1221040
CVE References: CVE-2019-25162, CVE-2020-36777, CVE-2020-36784, CVE-2021-46904, CVE-2021-46905, CVE-2021-46906, CVE-2021-46915, CVE-2021-46924, CVE-2021-46929, CVE-2021-46932, CVE-2021-46934, CVE-2021-46953, CVE-2021-46964, CVE-2021-46966, CVE-2021-46968, CVE-2021-46974, CVE-2021-46989, CVE-2021-47005, CVE-2021-47012, CVE-2021-47013, CVE-2021-47054, CVE-2021-47060, CVE-2021-47061, CVE-2021-47069, CVE-2021-47076, CVE-2021-47078, CVE-2021-47083, CVE-2022-20154, CVE-2022-48627, CVE-2023-28746, CVE-2023-35827, CVE-2023-46343, CVE-2023-51042, CVE-2023-52340, CVE-2023-52429, CVE-2023-52439, CVE-2023-52443, CVE-2023-52445, CVE-2023-52448, CVE-2023-52449, CVE-2023-52451, CVE-2023-52463, CVE-2023-52475, CVE-2023-52478, CVE-2023-52482, CVE-2023-52502, CVE-2023-52530, CVE-2023-52531, CVE-2023-52532, CVE-2023-52569, CVE-2023-52574, CVE-2023-52597, CVE-2023-52605, CVE-2023-6817, CVE-2024-0340, CVE-2024-0607, CVE-2024-1151, CVE-2024-23849, CVE-2024-23851, CVE-2024-26585, CVE-2024-26586, CVE-2024-26589, CVE-2024-26593, CVE-2024-26595, CVE-2024-26602, CVE-2024-26607, CVE-2024-26622
Sources used:
openSUSE Leap 15.3 (src): kernel-obs-qa-5.3.18-150300.59.153.1, kernel-livepatch-SLE15-SP3_Update_42-1-150300.7.3.2, kernel-syms-5.3.18-150300.59.153.1, kernel-default-base-5.3.18-150300.59.153.2.150300.18.90.2, kernel-source-5.3.18-150300.59.153.2, kernel-obs-build-5.3.18-150300.59.153.2
SUSE Linux Enterprise Live Patching 15-SP3 (src): kernel-livepatch-SLE15-SP3_Update_42-1-150300.7.3.2
SUSE Linux Enterprise High Performance Computing LTSS 15 SP3 (src): kernel-default-base-5.3.18-150300.59.153.2.150300.18.90.2, kernel-source-5.3.18-150300.59.153.2, kernel-syms-5.3.18-150300.59.153.1, kernel-obs-build-5.3.18-150300.59.153.2
SUSE Linux Enterprise Server 15 SP3 LTSS 15-SP3 (src): kernel-default-base-5.3.18-150300.59.153.2.150300.18.90.2, kernel-source-5.3.18-150300.59.153.2, kernel-syms-5.3.18-150300.59.153.1, kernel-obs-build-5.3.18-150300.59.153.2
SUSE Linux Enterprise Server for SAP Applications 15 SP3 (src): kernel-default-base-5.3.18-150300.59.153.2.150300.18.90.2, kernel-source-5.3.18-150300.59.153.2, kernel-syms-5.3.18-150300.59.153.1, kernel-obs-build-5.3.18-150300.59.153.2
SUSE Enterprise Storage 7.1 (src): kernel-default-base-5.3.18-150300.59.153.2.150300.18.90.2, kernel-source-5.3.18-150300.59.153.2, kernel-syms-5.3.18-150300.59.153.1, kernel-obs-build-5.3.18-150300.59.153.2
SUSE Linux Enterprise Micro 5.1 (src): kernel-default-base-5.3.18-150300.59.153.2.150300.18.90.2
SUSE Linux Enterprise Micro 5.2 (src): kernel-default-base-5.3.18-150300.59.153.2.150300.18.90.2
SUSE Linux Enterprise Micro for Rancher 5.2 (src): kernel-default-base-5.3.18-150300.59.153.2.150300.18.90.2

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 11 Andrea Mattiazzo 2024-05-23 15:57:07 UTC

All done, closing.