CVSS 3.1
5.5 mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCVE-2021-46968
Medium (5.5) in linux linux kernel. EPSS 0.2% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 12% of CVEs (scores of 2026-10-31)
- CWE
- CWE-401
- Published
- Modified
- Record from
- the NVD, synced
Affected
- linux:linux_kernel
References
- 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://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524