Race Condition Affecting kernel-debug-core package, versions <0:4.18.0-372.121.1.el8_6
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUGCORE-7891654
- published 4 Sep 2024
- disclosed 22 May 2024
Introduced: 22 May 2024
CVE-2021-47461 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-debug-core to version 0:4.18.0-372.121.1.el8_6 or higher.
This issue was patched in RHSA-2024:6297.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-core package and not the kernel-debug-core package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
userfaultfd: fix a race between writeprotect and exit_mmap()
A race is possible when a process exits, its VMAs are removed by exit_mmap() and at the same time userfaultfd_writeprotect() is called.
The race was detected by KASAN on a development kernel, but it appears to be possible on vanilla kernels as well.
Use mmget_not_zero() to prevent the race as done in other userfaultfd operations.