vfio/pci: fix memory leak during D3hot to D0 transition
Published Feb 26, 2025
5.5
MEDIUMCVSS 3.1
EPSS 0.27%
Description
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.
Affected products
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- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
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- Version 5.1StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<5.1
- Version 5.10.237StatusunaffectedConstraints<=5.10.*
- Version 5.15.33StatusunaffectedConstraints<=5.15.*
- Version 5.16.19StatusunaffectedConstraints<=5.16.*
- Version 5.17.2StatusunaffectedConstraints<=5.17.*
- Version 5.18StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
| ||||||||||||||||||||||||
| Linux | Linux | affected |
|
- ≥ 5.1 · < 5.15.33
- ≥ 5.16 · < 5.16.19
- ≥ 5.17 · < 5.17.2
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Fix deferred
Red Hat Enterprise Linux 9
kernel-rt
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (12)
- https://access.redhat.com/security/cve/CVE-2022-49219 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2348104 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-55007 Advisory
- https://git.kernel.org/stable/c/26ddd196e9eb264da8e1bdc4df8a94d62581c8b5 Patch
- https://git.kernel.org/stable/c/4319f17fb8264ba39352b611dfa913a4d8c1d1a0 Patch
- https://git.kernel.org/stable/c/c8a1f8bd586ee31020614b8d48b702ece3e2ae44 Patch
- https://git.kernel.org/stable/c/da426ad86027b849b877d4628b277ffbbd2f5325
- https://git.kernel.org/stable/c/eadf88ecf6ac7d6a9f47a76c6055d9a1987a8991 Patch
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://lore.kernel.org/linux-cve-announce/2025022621-CVE-2022-49219-3b9b@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2022-49219
- https://www.cve.org/CVERecord?id=CVE-2022-49219
Change history (0)
No recorded changes yet.