CVE-2024-26785

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-26785
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix protection fault in iommufd_test_syz_conv_iova Syzkaller reported the following bug: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7] Call Trace: lock_acquire lock_acquire+0x1ce/0x4f0 down_read+0x93/0x4a0 iommufd_test_syz_conv_iova+0x56/0x1f0 iommufd_test_access_rw.isra.0+0x2ec/0x390 iommufd_test+0x1058/0x1e30 iommufd_fops_ioctl+0x381/0x510 vfs_ioctl __do_sys_ioctl __se_sys_ioctl __x64_sys_ioctl+0x170/0x1e0 do_syscall_x64 do_syscall_64+0x71/0x140 This is because the new iommufd_access_change_ioas() sets access->ioas to NULL during its process, so the lock might be gone in a concurrent racing context. Fix this by doing the same access->ioas sanity as iommufd_access_rw() and iommufd_access_pin_pages() functions do.

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/cf7c2789822db8b5efa34f5ebcf1621bc0008d48
https://git.kernel.org/stable/c/fc719ecbca45c9c046640d72baddba3d83e0bc0b
https://git.kernel.org/stable/c/fd4d5cd7a2e8f08357c9bfc0905957cffe8ce568
Configurations

No configuration.

History

07 Nov 2024, 19:35

Type Values Removed Values Added
CWE CWE-120
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

10 Oct 2024, 12:15

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: iommufd: Se corrigió falla de protección en iommufd_test_syz_conv_iova Syzkaller informó el siguiente error: falla de protección general, probablemente para dirección no canónica 0xdffffc0000000038: 0000 [#1] SMP KASAN KASAN: null-ptr- deref en el rango [0x00000000000001c0-0x00000000000001c7] Seguimiento de llamadas: lock_acquire lock_acquire+0x1ce/0x4f0 down_read+0x93/0x4a0 iommufd_test_syz_conv_iova+0x56/0x1f0 iommufd_test_access_rw.isra. 0+0x2ec/0x390 iommufd_test+0x1058/0x1e30 iommufd_fops_ioctl+0x381/0x510 vfs_ioctl __do_sys_ioctl __se_sys_ioctl __x64_sys_ioctl +0x170/0x1e0 do_syscall_x64 do_syscall_64+0x71/0x140 Esto se debe a que el nuevo iommufd_access_change_ioas() establece access->ioas en NULL durante su proceso, por lo que el bloqueo podría desaparecer en un contexto de ejecución concurrente. Solucione este problema haciendo el mismo acceso->ioas cordura que hacen las funciones iommufd_access_rw() y iommufd_access_pin_pages().
References
  • () https://git.kernel.org/stable/c/fd4d5cd7a2e8f08357c9bfc0905957cffe8ce568 -

04 Apr 2024, 09:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-04-04 09:15

Updated : 2024-11-07 19:35

NVD link : CVE-2024-26785

Mitre link : CVE-2024-26785

CVE.ORG link : CVE-2024-26785

JSON object : View

Products Affected

No product.

CWE
CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')