7.8

CVE-2021-47058

regmap: set debugfs_name to NULL after it is freed

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.19.168 < 4.19.191
Linux ≫ Linux Kernel Version >= 5.4.90 < 5.4.119
Linux ≫ Linux Kernel Version >= 5.10.8 < 5.10.37
Linux ≫ Linux Kernel Version >= 5.11 < 5.11.21
Linux ≫ Linux Kernel Version >= 5.12 < 5.12.4
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.25% 0.155
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/2dc1554d5f0fdaf47cc5bea442b84b9226fea867
Patch
https://git.kernel.org/stable/c/b9e569ae1da3a113b3acee8703c94777fd20938a
Patch
https://git.kernel.org/stable/c/c764e375ae647832de1ee73d43a4bb3ef8a8f43d
Patch
https://git.kernel.org/stable/c/d8897f7b2283a500666c85ef06e820df38ed7b52
Patch
https://git.kernel.org/stable/c/e41a962f82e7afb5b1ee644f48ad0b3aee656268
Patch
https://git.kernel.org/stable/c/eb949f891226c012138ffd9df90d1e509f428ae6
Patch