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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-47482 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: net: batman-adv: fix error handling Syzbot reported ODEBUG warning in batadv_nc_mesh_free(). The problem was in wrong error handling in batadv_mesh_init(). Before this patch batadv_mesh_init() was calling batadv_mesh_free() in case of any batadv_*_init() calls failure. This approach may work well, when there is some kind of indicator, which can tell which parts of batadv are initialized; but there isn't any. All written above lead to cleaning up uninitialized fields. Even if we hide ODEBUG warning by initializing bat_priv->nc.work, syzbot was able to hit GPF in batadv_nc_purge_paths(), because hash pointer in still NULL. [1] To fix these bugs we can unwind batadv_*_init() calls one by one. It is good approach for 2 reasons: 1) It fixes bugs on error handling path 2) It improves the performance, since we won't call unneeded batadv_*_free() functions. So, this patch makes all batadv_*_init() clean up all allocated memory before returning with an error to no call correspoing batadv_*_free() and open-codes batadv_mesh_free() with proper order to avoid touching uninitialized fields.


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

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e CVE, kernel.org Patch 
https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51 CVE, kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-544 Missing Standardized Error Handling Mechanism CISA-ADP  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47482
NVD Published Date:
05/22/2024
NVD Last Modified:
04/02/2025
Source:
kernel.org