Unrated severityNVD Advisory· Published Feb 27, 2024· Updated May 4, 2025

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

CVE-2021-46968

Description

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

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.

Affected products

osv-coords43 versions
pkg:rpm/suse/kernel-64kb&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/kernel-default-base&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Micro%205.2 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Micro%205.2 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3 pkg:rpm/suse/kernel-docs&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3 pkg:rpm/suse/kernel-livepatch-SLE15-SP3_Update_42&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3 pkg:rpm/suse/kernel-preempt&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.2 pkg:rpm/suse/kernel-source&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.2 pkg:rpm/suse/kernel-syms&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS
< 5.3.18-150300.59.153.2+ 42 more
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2.150300.18.90.2
- (no CPE)range: < 5.3.18-150300.59.153.2.150300.18.90.2
- (no CPE)range: < 5.3.18-150300.59.153.2.150300.18.90.2
- (no CPE)range: < 5.3.18-150300.59.153.2.150300.18.90.2
- (no CPE)range: < 5.3.18-150300.59.153.2.150300.18.90.2
- (no CPE)range: < 5.3.18-150300.59.153.2.150300.18.90.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 1-150300.7.3.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.161.1
- (no CPE)range: < 5.3.18-150300.161.1
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.59.153.2
- (no CPE)range: < 5.3.18-150300.161.1
- (no CPE)range: < 5.3.18-150300.161.1
- (no CPE)range: < 5.3.18-150300.59.153.1
- (no CPE)range: < 5.3.18-150300.59.153.1
- (no CPE)range: < 5.3.18-150300.59.153.1
- (no CPE)range: < 5.3.18-150300.59.153.1
- (no CPE)range: < 5.3.18-150300.59.153.2
Linux/Linuxcpe-rescue
Range: 5.10

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

News mentions

No linked articles in our index yet.

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