// For flags

CVE-2022-48714

bpf: Use VM_MAP instead of VM_ALLOC for ringbuf

Severity Score

"-"
*CVSS v-

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:

bpf: Use VM_MAP instead of VM_ALLOC for ringbuf

After commit 2fd3fb0be1d1 ("kasan, vmalloc: unpoison VM_ALLOC pages
after mapping"), non-VM_ALLOC mappings will be marked as accessible
in __get_vm_area_node() when KASAN is enabled. But now the flag for
ringbuf area is VM_ALLOC, so KASAN will complain out-of-bound access
after vmap() returns. Because the ringbuf area is created by mapping
allocated pages, so use VM_MAP instead.

After the change, info in /proc/vmallocinfo also changes from
[start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmalloc user
to
[start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmap user

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: bpf: use VM_MAP en lugar de VM_ALLOC para ringbuf Después del commit 2fd3fb0be1d1 ("kasan, vmalloc: despoisone las páginas VM_ALLOC después del mapeo"), los mapeos que no sean VM_ALLOC se marcarán como accesibles en __get_vm_area_node( ) cuando KASAN está habilitado. Pero ahora el indicador para el área ringbuf es VM_ALLOC, por lo que KASAN se quejará del acceso fuera de los límites después de que regrese vmap(). Debido a que el área ringbuf se crea asignando páginas asignadas, use VM_MAP en su lugar. Después del cambio, la información en /proc/vmallocinfo también cambia de [inicio]-[fin] 24576 ringbuf_map_alloc+0x171/0x290 usuario vmalloc a [inicio]-[fin] 24576 ringbuf_map_alloc+0x171/0x290 usuario vmap

*Credits: N/A
CVSS Scores
Attack Vector
-
Attack Complexity
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Privileges Required
-
User Interaction
-
Scope
-
Confidentiality
-
Integrity
-
Availability
-
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-06-20 CVE Reserved
  • 2024-06-20 CVE Published
  • 2024-06-21 EPSS Updated
  • 2024-11-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
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"
 >= 5.8 < 5.10.99
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 5.10.99"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.8 < 5.15.22
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 5.15.22"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.8 < 5.16.8
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 5.16.8"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.8 < 5.17
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 5.17"
en
Affected