// For flags

CVE-2024-27022

fork: defer linking file vma until vma is fully initialized

Severity Score

7.8
*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:

fork: defer linking file vma until vma is fully initialized

Thorvald reported a WARNING [1]. And the root cause is below race:

CPU 1 CPU 2
fork hugetlbfs_fallocate
dup_mmap hugetlbfs_punch_hole
i_mmap_lock_write(mapping);
vma_interval_tree_insert_after -- Child vma is visible through i_mmap tree.
i_mmap_unlock_write(mapping);
hugetlb_dup_vma_private -- Clear vma_lock outside i_mmap_rwsem!
i_mmap_lock_write(mapping);
hugetlb_vmdelete_list
vma_interval_tree_foreach
hugetlb_vma_trylock_write -- Vma_lock is cleared.
tmp->vm_ops->open -- Alloc new vma_lock outside i_mmap_rwsem!
hugetlb_vma_unlock_write -- Vma_lock is assigned!!!
i_mmap_unlock_write(mapping);

hugetlb_dup_vma_private() and hugetlb_vm_op_open() are called outside
i_mmap_rwsem lock while vma lock can be used in the same time. Fix this
by deferring linking file vma until vma is fully initialized. Those vmas
should be initialized first before they can be used.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: fork: posponga la vinculación del archivo vma hasta que vma esté completamente inicializado. Thorvald informó una ADVERTENCIA [1]. Y la causa raíz está por debajo de la raza: CPU 1 CPU 2 fork hugetlbfs_fallocate dup_mmap hugetlbfs_punch_hole i_mmap_lock_write(mapping); vma_interval_tree_insert_after: el vma secundario es visible a través del árbol i_mmap. i_mmap_unlock_write(mapeo); enormetlb_dup_vma_private: ¡borre vma_lock fuera de i_mmap_rwsem! i_mmap_lock_write(mapeo); Hugetlb_vmdelete_list vma_interval_tree_foreach Hugetlb_vma_trylock_write: Vma_lock está borrado. tmp->vm_ops->open - ¡Asigne nuevo vma_lock fuera de i_mmap_rwsem! enormetlb_vma_unlock_write - ¡¡¡Vma_lock está asignado!!! i_mmap_unlock_write(mapeo); Hugetlb_dup_vma_private() y hugetlb_vm_op_open() se llaman fuera del bloqueo i_mmap_rwsem, mientras que el bloqueo vma se puede utilizar al mismo tiempo. Solucione este problema posponiendo la vinculación del archivo vma hasta que vma esté completamente inicializado. Esos vmas deben inicializarse primero antes de poder usarlos.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
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
  • 2024-02-19 CVE Reserved
  • 2024-05-01 CVE Published
  • 2024-05-24 EPSS Updated
  • 2024-09-11 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-908: Use of Uninitialized Resource
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"
 >= 6.1 < 6.1.90
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1 < 6.1.90"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.1 < 6.1.95
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1 < 6.1.95"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.1 < 6.6.30
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1 < 6.6.30"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.1 < 6.6.35
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1 < 6.6.35"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.1 < 6.8.8
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1 < 6.8.8"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.1 < 6.9
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1 < 6.9"
en
Affected