// For flags

CVE-2021-47368

enetc: Fix illegal access when reading affinity_hint

Severity Score

8.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved:

enetc: Fix illegal access when reading affinity_hint

irq_set_affinity_hit() stores a reference to the cpumask_t
parameter in the irq descriptor, and that reference can be
accessed later from irq_affinity_hint_proc_show(). Since
the cpu_mask parameter passed to irq_set_affinity_hit() has
only temporary storage (it's on the stack memory), later
accesses to it are illegal. Thus reads from the corresponding
procfs affinity_hint file can result in paging request oops.

The issue is fixed by the get_cpu_mask() helper, which provides
a permanent storage for the cpumask_t parameter.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: enetc: corrige el acceso ilegal al leer affinity_hint irq_set_affinity_hit() almacena una referencia al parámetro cpumask_t en el descriptor irq, y se puede acceder a esa referencia más tarde desde irq_affinity_hint_proc_show(). Dado que el parámetro cpu_mask pasado a irq_set_affinity_hit() solo tiene almacenamiento temporal (está en la memoria de la pila), los accesos posteriores a él son ilegales. Por lo tanto, las lecturas del archivo procfs affinity_hint correspondiente pueden dar como resultado una solicitud de paginación. El problema lo soluciona el asistente get_cpu_mask(), que proporciona un almacenamiento permanente para el parámetro cpumask_t.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-21 CVE Reserved
  • 2024-05-21 CVE Published
  • 2024-05-22 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.1 < 5.4.150
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 5.4.150"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.1 < 5.10.70
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 5.10.70"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.1 < 5.14.9
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 5.14.9"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.1 < 5.15
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 5.15"
en
Affected