CVE-2021-46968 - OpenCVE

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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524
https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599
https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2
https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3
https://lore.kernel.org/linux-cve-announce/2024022720-CVE-2021-46968-8c71@gregkh/T/#u
https://nvd.nist.gov/vuln/detail/CVE-2021-46968
https://www.cve.org/CVERecord?id=CVE-2021-46968

History

Mon, 04 Nov 2024 12:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 11 Sep 2024 18:30:00 +0000

Type	Values Removed	Values Added
Metrics	ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 11 Sep 2024 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-02-27T18:47:04.856Z

Updated: 2024-11-04T11:56:51.100Z

Reserved: 2024-02-27T18:42:55.943Z

Link: CVE-2021-46968

Vulnrichment

Updated: 2024-08-04T05:17:42.992Z

NVD

Status : Awaiting Analysis

Published: 2024-02-27T19:04:07.217

Modified: 2024-02-28T14:06:45.783

Link: CVE-2021-46968

Redhat

Severity : Low

Publid Date: 2024-02-27T00:00:00Z

Links: CVE-2021-46968 - Bugzilla

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-46968", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-27T18:42:55.943Z", "datePublished": "2024-02-27T18:47:04.856Z", "dateUpdated": "2024-11-04T11:56:51.100Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T11:56:51.100Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: fix zcard and zqueue hot-unplug memleak\n\nTests with kvm and a kmemdebug kernel showed, that on hot unplug the\nzcard and zqueue structs for the unplugged card or queue are not\nproperly freed because of a mismatch with get/put for the embedded\nkref counter.\n\nThis fix now adjusts the handling of the kref counters. With init the\nkref counter starts with 1. This initial value needs to drop to zero\nwith the unregister of the card or queue to trigger the release and\nfree the object."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/s390/crypto/zcrypt_card.c", "drivers/s390/crypto/zcrypt_queue.c"], "versions": [{"version": "29c2680fd2bf", "lessThan": "026499a9c2e0", "status": "affected", "versionType": "git"}, {"version": "29c2680fd2bf", "lessThan": "055a063a18bc", "status": "affected", "versionType": "git"}, {"version": "29c2680fd2bf", "lessThan": "971dc8706cee", "status": "affected", "versionType": "git"}, {"version": "29c2680fd2bf", "lessThan": "70fac8088cfa", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/s390/crypto/zcrypt_card.c", "drivers/s390/crypto/zcrypt_queue.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.36", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.11.20", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.12.3", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524"}, {"url": "https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599"}, {"url": "https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3"}, {"url": "https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2"}], "title": "s390/zcrypt: fix zcard and zqueue hot-unplug memleak", "x_generator": {"engine": "bippy-9e1c9544281a"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.992Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-46968", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:01:31.707354Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:46.536Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.992Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-46968", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:01:31.707354Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:18.598Z"}}], "cna": {"title": "s390/zcrypt: fix zcard and zqueue hot-unplug memleak", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "29c2680fd2bf", "lessThan": "026499a9c2e0", "versionType": "git"}, {"status": "affected", "version": "29c2680fd2bf", "lessThan": "055a063a18bc", "versionType": "git"}, {"status": "affected", "version": "29c2680fd2bf", "lessThan": "971dc8706cee", "versionType": "git"}, {"status": "affected", "version": "29c2680fd2bf", "lessThan": "70fac8088cfa", "versionType": "git"}], "programFiles": ["drivers/s390/crypto/zcrypt_card.c", "drivers/s390/crypto/zcrypt_queue.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.36", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.11.20", "versionType": "semver", "lessThanOrEqual": "5.11.*"}, {"status": "unaffected", "version": "5.12.3", "versionType": "semver", "lessThanOrEqual": "5.12.*"}, {"status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/s390/crypto/zcrypt_card.c", "drivers/s390/crypto/zcrypt_queue.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524"}, {"url": "https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599"}, {"url": "https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3"}, {"url": "https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2"}], "x_generator": {"engine": "bippy-9e1c9544281a"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: fix zcard and zqueue hot-unplug memleak\n\nTests with kvm and a kmemdebug kernel showed, that on hot unplug the\nzcard and zqueue structs for the unplugged card or queue are not\nproperly freed because of a mismatch with get/put for the embedded\nkref counter.\n\nThis fix now adjusts the handling of the kref counters. With init the\nkref counter starts with 1. This initial value needs to drop to zero\nwith the unregister of the card or queue to trigger the release and\nfree the object."}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T11:56:51.100Z"}}}, "cveMetadata": {"cveId": "CVE-2021-46968", "state": "PUBLISHED", "dateUpdated": "2024-11-04T11:56:51.100Z", "dateReserved": "2024-02-27T18:42:55.943Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-02-27T18:47:04.856Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"bugzilla": {"description": "kernel: s390/zcrypt: fix zcard and zqueue hot-unplug memleak", "id": "2266802", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266802"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ns390/zcrypt: fix zcard and zqueue hot-unplug memleak\nTests with kvm and a kmemdebug kernel showed, that on hot unplug the\nzcard and zqueue structs for the unplugged card or queue are not\nproperly freed because of a mismatch with get/put for the embedded\nkref counter.\nThis fix now adjusts the handling of the kref counters. With init the\nkref counter starts with 1. This initial value needs to drop to zero\nwith the unregister of the card or queue to trigger the release and\nfree the object."], "name": "CVE-2021-46968", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-46968\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-46968\nhttps://lore.kernel.org/linux-cve-announce/2024022720-CVE-2021-46968-8c71@gregkh/T/#u"], "statement": "No Red Hat Products are affected by this vulnerability.", "threat_severity": "Low", "upstream_fix": "kernel 5.10.36, kernel 5.11.20, kernel 5.12.3, kernel 5.13"}