CVE-2021-47542
Linux QLogic qlcnic NULL Pointer Dereference
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.
INFO
Published Date :
May 24, 2024, 3:15 p.m.
Last Modified :
June 10, 2024, 6:34 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47542.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47542 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47542 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 10, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105 No Types Assigned https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105 Patch Changed Reference Type https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 No Types Assigned https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 Patch Changed Reference Type https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 No Types Assigned https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 Patch Changed Reference Type https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf No Types Assigned https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf Patch Changed Reference Type https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 No Types Assigned https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 Patch Changed Reference Type https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f No Types Assigned https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f Patch Changed Reference Type https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 No Types Assigned https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 Patch Changed Reference Type https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572 No Types Assigned https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572 Patch Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.9 up to (excluding) 4.4.294 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.292 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.257 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.220 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.164 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.84 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.7 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 24, 2024
Action Type Old Value New Value Added 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. Added Reference kernel.org https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47542 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47542
weaknesses.