Race Condition Affecting kernel-debug package, versions <0:4.18.0-305.57.1.el8_4
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUG-4193551
- published 26 Jul 2021
- disclosed 3 Jun 2020
Introduced: 3 Jun 2020
CVE-2020-29368 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-debug to version 0:4.18.0-305.57.1.el8_4 or higher.
This issue was patched in RHSA-2022:5626.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug package and not the kernel-debug package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.
References
- https://security.netapp.com/advisory/ntap-20210108-0002/
- https://access.redhat.com/security/cve/CVE-2020-29368
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2045
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040