CVE-2022-49219

published 2025-02-26

CVE-2022-49219: In the Linux kernel, the following vulnerability has been resolved: vfio/pci: fix memory leak during D3hot to D0 transition If…

Priority P4 20 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.17.3-1 (bookworm)	linux 5.17.3-1 (bookworm)
linux	linux	—	—
linux	linux	>= 51ef3a004b1eb6241e56b3aa8495769a092a4dc2 < da426ad86027b849b877d4628b277ffbbd2f5325	da426ad86027b849b877d4628b277ffbbd2f5325
linux	linux	>= 51ef3a004b1eb6241e56b3aa8495769a092a4dc2 < 4319f17fb8264ba39352b611dfa913a4d8c1d1a0	4319f17fb8264ba39352b611dfa913a4d8c1d1a0
linux	linux	>= 51ef3a004b1eb6241e56b3aa8495769a092a4dc2 < 26ddd196e9eb264da8e1bdc4df8a94d62581c8b5	26ddd196e9eb264da8e1bdc4df8a94d62581c8b5
linux	linux	>= 51ef3a004b1eb6241e56b3aa8495769a092a4dc2 < c8a1f8bd586ee31020614b8d48b702ece3e2ae44	c8a1f8bd586ee31020614b8d48b702ece3e2ae44
linux	linux	>= 51ef3a004b1eb6241e56b3aa8495769a092a4dc2 < eadf88ecf6ac7d6a9f47a76c6055d9a1987a8991	eadf88ecf6ac7d6a9f47a76c6055d9a1987a8991
linux	linux_kernel	>= 0 < 5.10.237-1	5.10.237-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 5.1 < 5.15.33	5.15.33
linux	linux_kernel	>= 5.16 < 5.16.19	5.16.19
linux	linux_kernel	>= 5.17 < 5.17.2	5.17.2

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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