Use After Free Affecting kernel-debug package, versions *
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Test your applications- Snyk ID SNYK-RHEL7-KERNELDEBUG-6353904
- published 1 Mar 2024
- disclosed 29 Feb 2024
Introduced: 29 Feb 2024
CVE-2021-47058 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:7 kernel-debug.
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:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
regmap: set debugfs_name to NULL after it is freed
There is a upstream commit cffa4b2122f5("regmap:debugfs: Fix a memory leak when calling regmap_attach_dev") that adds a if condition when create name for debugfs_name. With below function invoking logical, debugfs_name is freed in regmap_debugfs_exit(), but it is not created again because of the if condition introduced by above commit. regmap_reinit_cache() regmap_debugfs_exit() ... regmap_debugfs_init() So, set debugfs_name to NULL after it is freed.
References
- https://access.redhat.com/security/cve/CVE-2021-47058
- https://git.kernel.org/stable/c/2dc1554d5f0fdaf47cc5bea442b84b9226fea867
- https://git.kernel.org/stable/c/b9e569ae1da3a113b3acee8703c94777fd20938a
- https://git.kernel.org/stable/c/c764e375ae647832de1ee73d43a4bb3ef8a8f43d
- https://git.kernel.org/stable/c/d8897f7b2283a500666c85ef06e820df38ed7b52
- https://git.kernel.org/stable/c/e41a962f82e7afb5b1ee644f48ad0b3aee656268
- https://git.kernel.org/stable/c/eb949f891226c012138ffd9df90d1e509f428ae6