U.S. flag   An official website of the United States government
Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock (Dot gov) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-47483 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: regmap: Fix possible double-free in regcache_rbtree_exit() In regcache_rbtree_insert_to_block(), when 'present' realloc failed, the 'blk' which is supposed to assign to 'rbnode->block' will be freed, so 'rbnode->block' points a freed memory, in the error handling path of regcache_rbtree_init(), 'rbnode->block' will be freed again in regcache_rbtree_exit(), KASAN will report double-free as follows: BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390 Call Trace: slab_free_freelist_hook+0x10d/0x240 kfree+0xce/0x390 regcache_rbtree_exit+0x15d/0x1a0 regcache_rbtree_init+0x224/0x2c0 regcache_init+0x88d/0x1310 __regmap_init+0x3151/0x4a80 __devm_regmap_init+0x7d/0x100 madera_spi_probe+0x10f/0x333 [madera_spi] spi_probe+0x183/0x210 really_probe+0x285/0xc30 To fix this, moving up the assignment of rbnode->block to immediately after the reallocation has succeeded so that the data structure stays valid even if the second reallocation fails.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].

URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f CVE, kernel.org Patch 
https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2 CVE, kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-415 Double Free cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47483
NVD Published Date:
05/22/2024
NVD Last Modified:
06/17/2026
Source:
kernel.org