CVE-2021-47542

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47542
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105 Patch
https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 Patch
https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 Patch
https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf Patch
https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 Patch
https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f Patch
https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 Patch
https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

10 Jun 2024, 18:34

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux
Linux linux Kernel
References () https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105 - () https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105 - Patch
References () https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 - () https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 - Patch
References () https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 - () https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 - Patch
References () https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf - () https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf - Patch
References () https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 - () https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 - Patch
References () https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f - () https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f - Patch
References () https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 - () https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 - Patch
References () https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572 - () https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572 - Patch
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: qlogic: qlcnic: corrigió una desreferencia de puntero NULL en qlcnic_83xx_add_rings() En qlcnic_83xx_add_rings(), se llamará a la función indirecta de ahw->hw_ops->alloc_mbx_args para asignar memoria para cmd.req.arg, y hay una desreferencia del mismo en qlcnic_83xx_add_rings(), lo que podría llevar a una desreferencia del puntero NULL en caso de falla de la función indirecta como qlcnic_83xx_alloc_mbx_args(). Corrija este error agregando una verificación de alloc_mbx_args(); este parche imita la lógica del manejo de fallas de mbx_cmd(). Este error fue encontrado por un analizador estático. El análisis emplea verificación diferencial para identificar operaciones de seguridad inconsistentes (por ejemplo, comprobaciones o kfrees) entre dos rutas de código y confirma que las operaciones inconsistentes no se recuperan en la función actual o en las personas que llaman, por lo que constituyen errores. Tenga en cuenta que, como error encontrado mediante análisis estático, puede ser un falso positivo o difícil de activar. Varios investigadores han realizado una revisión cruzada del error. Las compilaciones con CONFIG_QLCNIC=m no muestran nuevas advertencias y nuestro analizador estático ya no advierte sobre este código.
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-476

24 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-24 15:15

Updated : 2024-06-10 18:34

NVD link : CVE-2021-47542

Mitre link : CVE-2021-47542

CVE.ORG link : CVE-2021-47542

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference