CVE-2024-26785

iommufd: Fix protection fault in iommufd_test_syz_conv_iova

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

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.

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().

A protection fault vulnerability was found in the iommufd subsystem of the Linux kernel. This flaw could lead to unexpected behavior or system instability.

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.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-02-19 CVE Reserved
2024-04-04 CVE Published
2024-10-11 EPSS Updated
2024-12-19 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-400: Uncontrolled Resource Consumption

CAPEC

References (6)

URL	Tag	Source
https://git.kernel.org/stable/c/9227da7816dd1a42e20d41e2244cb63c205477ca	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/fd4d5cd7a2e8f08357c9bfc0905957cffe8ce568	2024-10-10
https://git.kernel.org/stable/c/fc719ecbca45c9c046640d72baddba3d83e0bc0b	2024-03-06
https://git.kernel.org/stable/c/cf7c2789822db8b5efa34f5ebcf1621bc0008d48	2024-02-26

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-26785	2024-11-12
https://bugzilla.redhat.com/show_bug.cgi?id=2273461	2024-11-12

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"				>= 6.6 < 6.6.55 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6 < 6.6.55"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.6 < 6.7.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6 < 6.7.9"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.6 < 6.8 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6 < 6.8"		en		Affected