CVE-2021-46968
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…
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-401
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524Patch
- https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599Patch
- https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2Patch
- https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3Patch
- https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524Patch
- https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599Patch
- https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2Patch
- https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.