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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-47542 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings() In qlcnic_83xx_add_rings(), the indirect function of ahw->hw_ops->alloc_mbx_args will be called to allocate memory for cmd.req.arg, and there is a dereference of it in qlcnic_83xx_add_rings(), which could lead to a NULL pointer dereference on failure of the indirect function like qlcnic_83xx_alloc_mbx_args(). Fix this bug by adding a check of alloc_mbx_args(), this patch imitates the logic of mbx_cmd()'s failure handling. This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs. Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug. Builds with CONFIG_QLCNIC=m show no new warnings, and our static analyzer no longer warns about this code.


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/15fa12c119f869173f9b710cbe6a4a14071d2105 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf CVE, kernel.org Patch 
https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f CVE, kernel.org Patch 
https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572 CVE, kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference cwe source acceptance level NIST  

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47542
NVD Published Date:
05/24/2024
NVD Last Modified:
11/21/2024
Source:
kernel.org