CVE-2021-46968
Linux Kernel s390 Zcrypt Memory Leak Vulnerability
Description
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.
INFO
Published Date :
Feb. 27, 2024, 7:04 p.m.
Last Modified :
Jan. 8, 2025, 4:50 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to a patched version.
- Reboot the system to apply the update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-46968.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-46968 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-46968
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-46968 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-46968 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 08, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST CWE-401 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10 up to (excluding) 5.10.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.20 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.3 Changed Reference Type https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 No Types Assigned https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 Patch Changed Reference Type https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 No Types Assigned https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 Patch Changed Reference Type https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 No Types Assigned https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 Patch Changed Reference Type https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 No Types Assigned https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 Patch Changed Reference Type https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 No Types Assigned https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 Patch Changed Reference Type https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 No Types Assigned https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 Patch Changed Reference Type https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 No Types Assigned https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 Patch Changed Reference Type https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 No Types Assigned https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 Added Reference https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 Added Reference https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 Added Reference https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 27, 2024
Action Type Old Value New Value Added Description 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. Added Reference Linux https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2 [No types assigned]