CVE-2022-49219

MEDIUM EPSS 15.9%
Published Feb 26, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 26, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: fix memory leak during D3hot to D0 transition If 'vfio_pci_core_device::needs_pm_restore' is set (PCI device does not have No_Soft_Reset bit set in its PMCSR config register), then the current PCI state will be saved locally in 'vfio_pci_core_device::pm_save' during D0->D3hot transition and same will be restored back during D3hot->D0 transition. For saving the PCI state locally, pci_store_saved_state() is being used and the pci_load_and_free_saved_state() will free the allocated memory. But for reset related IOCTLs, vfio driver calls PCI reset-related API's which will internally change the PCI power state back to D0. So, when the guest resumes, then it will get the current state as D0 and it will skip the call to vfio_pci_set_power_state() for changing the power state to D0 explicitly. In this case, the memory pointed by 'pm_save' will never be freed. In a malicious sequence, the state changing to D3hot followed by VFIO_DEVICE_RESET/VFIO_DEVICE_PCI_HOT_RESET can be run in a loop and it can cause an OOM situation. This patch frees the earlier allocated memory first before overwriting 'pm_save' to prevent the mentioned memory leak.

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
15.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*≥5.1  –  <5.15.33
linuxlinux_kernel*≥5.16  –  <5.16.19
linuxlinux_kernel*≥5.17  –  <5.17.2

References 6

  • git.kernel.org https://git.kernel.org/stable/c/26ddd196e9eb264da8e1bdc4df8a94d62581c8b5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4319f17fb8264ba39352b611dfa913a4d8c1d1a0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c8a1f8bd586ee31020614b8d48b702ece3e2ae44
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/da426ad86027b849b877d4628b277ffbbd2f5325
  • git.kernel.org https://git.kernel.org/stable/c/eadf88ecf6ac7d6a9f47a76c6055d9a1987a8991
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/26ddd196e9eb264da8e1bdc4df8a94d62581c8b5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4319f17fb8264ba39352b611dfa913a4d8c1d1a0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c8a1f8bd586ee31020614b8d48b702ece3e2ae44
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eadf88ecf6ac7d6a9f47a76c6055d9a1987a8991
    Patch