CVE-2021-47061 KVM: Destroy I/O bus devices on unregister failure _after_ sync'ing SRCU

2024-02-2922:37:35

Linux

www.cve.org

linux kernel

kvm

i/o bus

unregister

vulnerability fix

use-after-free

AI Score

7.6

Confidence

High

EPSS

Percentile

15.5%

JSON

In the Linux kernel, the following vulnerability has been resolved:

KVM: Destroy I/O bus devices on unregister failure after sync’ing SRCU

If allocating a new instance of an I/O bus fails when unregistering a
device, wait to destroy the device until after all readers are guaranteed
to see the new null bus. Destroying devices before the bus is nullified
could lead to use-after-free since readers expect the devices on their
reference of the bus to remain valid.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "virt/kvm/kvm_main.c"
    ],
    "versions": [
      {
        "version": "f65886606c2d",
        "lessThan": "03c6cccedd39",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f65886606c2d",
        "lessThan": "4e899ca84863",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f65886606c2d",
        "lessThan": "30f46c699373",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f65886606c2d",
        "lessThan": "2ee3757424be",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "virt/kvm/kvm_main.c"
    ],
    "versions": [
      {
        "version": "5.9",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.9",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.37",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.11.21",
        "lessThanOrEqual": "5.11.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.12.4",
        "lessThanOrEqual": "5.12.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.13",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]