// For flags

CVE-2021-47516

nfp: Fix memory leak in nfp_cpp_area_cache_add()

Severity Score

5.5
*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:

nfp: Fix memory leak in nfp_cpp_area_cache_add()

In line 800 (#1), nfp_cpp_area_alloc() allocates and initializes a
CPP area structure. But in line 807 (#2), when the cache is allocated
failed, this CPP area structure is not freed, which will result in
memory leak.

We can fix it by freeing the CPP area when the cache is allocated
failed (#2).

792 int nfp_cpp_area_cache_add(struct nfp_cpp *cpp, size_t size)
793 {
794 struct nfp_cpp_area_cache *cache;
795 struct nfp_cpp_area *area;

800 area = nfp_cpp_area_alloc(cpp, NFP_CPP_ID(7, NFP_CPP_ACTION_RW, 0),
801 0, size);
// #1: allocates and initializes

802 if (!area)
803 return -ENOMEM;

805 cache = kzalloc(sizeof(*cache), GFP_KERNEL);
806 if (!cache)
807 return -ENOMEM; // #2: missing free

817 return 0;
818 }

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: nfp: corrige la pérdida de memoria en nfp_cpp_area_cache_add() En la línea 800 (#1), nfp_cpp_area_alloc() asigna e inicializa una estructura de área CPP. Pero en la línea 807 (#2), cuando falla la asignación de caché, esta estructura de área CPP no se libera, lo que resultará en una pérdida de memoria. Podemos solucionarlo liberando el área de CPP cuando falla la asignación de caché (#2). 792 int nfp_cpp_area_cache_add(struct nfp_cpp *cpp, size_t tamaño) 793 { 794 struct nfp_cpp_area_cache *cache; 795 estructura nfp_cpp_area *área; área 800 = nfp_cpp_area_alloc(cpp, NFP_CPP_ID(7, NFP_CPP_ACTION_RW, 0), 801 0, tamaño); // #1: asigna e inicializa 802 if (!area) 803 return -ENOMEM; 805 caché = kzalloc(sizeof(*cache), GFP_KERNEL); 806 si (!cache) 807 retorno -ENOMEM; // #2: falta el retorno 817 gratuito 0; 818 }

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-24 CVE Reserved
  • 2024-05-24 CVE Published
  • 2024-06-11 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-401: Missing Release of Memory after Effective Lifetime
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"
>= 4.11 < 4.14.258
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.11 < 4.14.258"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.11 < 4.19.221
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.11 < 4.19.221"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.11 < 5.4.165
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.11 < 5.4.165"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.11 < 5.10.85
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.11 < 5.10.85"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.11 < 5.15.8
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.11 < 5.15.8"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.11 < 5.16
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.11 < 5.16"
en
Affected