CVE-2026-46034

MEDIUM EPSS 2.3%
Published May 27, 20261mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: vfio/cdx: Fix NULL pointer dereference in interrupt trigger path Add validation to ensure MSI is configured before accessing cdx_irqs array in vfio_cdx_set_msi_trigger(). Without this check, userspace can trigger a NULL pointer dereference by calling VFIO_DEVICE_SET_IRQS with VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE flags before ever setting up interrupts via VFIO_IRQ_SET_DATA_EVENTFD. The vfio_cdx_msi_enable() function allocates the cdx_irqs array and sets config_msi to 1 only when called through the EVENTFD path. The trigger loop (for DATA_BOOL/DATA_NONE) assumed this had already been done, but there was no enforcement of this call ordering. This matches the protection used in the PCI VFIO driver where vfio_pci_set_msi_trigger() checks irq_is() before the trigger loop.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*≥6.10  –  <6.12.86
linuxlinux_kernel*≥6.13  –  <6.18.27
linuxlinux_kernel*≥6.19  –  <7.0.4

References 4

  • git.kernel.org https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d
    Patch