CVE-2021-47061 (GCVE-0-2021-47061)
Vulnerability from cvelistv5
Published
2024-02-29 22:37
Modified
2026-08-05 08:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: f65886606c2d3b562716de030706dfe1bea4ed5e
Version: f65886606c2d3b562716de030706dfe1bea4ed5e
Version: f65886606c2d3b562716de030706dfe1bea4ed5e
Version: f65886606c2d3b562716de030706dfe1bea4ed5e
Version: f0dfffce3f4ffd5f822568a4a6fb34c010e939d1
Version: 840e124f89a5127e7eb97ebf377f4b8ca745c070
Version: 40a023f681befd9b2862a3c16fb306a38b359ae5
Version: 19184bd06f488af62924ff1747614a8cb284ad63
Version: 41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d
Version: 68c125324b5e1d1d22805653735442923d896a1d
Version: 4.4.238   ≤
Version: 4.9.238   ≤
Version: 4.14.200   ≤
Version: 4.19.148   ≤
Version: 5.4.66   ≤
Version: 5.8.10   ≤
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the unregister paths have no additional capability gate.\\nUI:N - Exploitation is fully self-driven via the attacker\\u2019s own KVM ioctls and VCPU threads; no separate victim action is required.\\nS:U - This is host-userspace privilege escalation into the host kernel via the attacker\\u2019s VM fd, not a guest-to-host escape across a separate security authority.\\nC:H - Use-after-free of heap-backed I/O devices (ioeventfd/coalesced MMIO) while VCPUs still invoke their ops enables reclaim and arbitrary read primitives.\\nI:H - The same UAF lets an attacker forge device ops (function pointers) on reclaimed objects during MMIO/PIO emulation, enabling control-flow hijack and arbitrary write.\\nA:H - Use-after-free and destroyed-bus list walks cause kernel oops/panic even without full exploitation, fully impacting host availability.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f65886606c2d3b562716de030706dfe1bea4ed5e\", \"lessThan\": \"03c6cccedd3913006744faa252a4da5145299343\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f65886606c2d3b562716de030706dfe1bea4ed5e\", \"lessThan\": \"4e899ca848636b37e9ac124bc1723862a7d7d927\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f65886606c2d3b562716de030706dfe1bea4ed5e\", \"lessThan\": \"30f46c6993731efb2a690c9197c0fd9ed425da2d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f65886606c2d3b562716de030706dfe1bea4ed5e\", \"lessThan\": \"2ee3757424be7c1cd1d0bbfa6db29a7edd82a250\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f0dfffce3f4ffd5f822568a4a6fb34c010e939d1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"840e124f89a5127e7eb97ebf377f4b8ca745c070\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"40a023f681befd9b2862a3c16fb306a38b359ae5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"19184bd06f488af62924ff1747614a8cb284ad63\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"68c125324b5e1d1d22805653735442923d896a1d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.4.238\", \"lessThan\": \"4.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.9.238\", \"lessThan\": \"4.10\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.14.200\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.148\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.66\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.8.10\", \"lessThan\": \"5.9\", \"versionType\": \"semver\"}], \"programFiles\": [\"virt/kvm/kvm_main.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.37\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"virt/kvm/kvm_main.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/03c6cccedd3913006744faa252a4da5145299343\"}, {\"url\": \"https://git.kernel.org/stable/c/4e899ca848636b37e9ac124bc1723862a7d7d927\"}, {\"url\": \"https://git.kernel.org/stable/c/30f46c6993731efb2a690c9197c0fd9ed425da2d\"}, {\"url\": \"https://git.kernel.org/stable/c/2ee3757424be7c1cd1d0bbfa6db29a7edd82a250\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: Destroy I/O bus devices on unregister failure _after_ sync\u0027ing SRCU\\n\\nIf allocating a new instance of an I/O bus fails when unregistering a\\ndevice, wait to destroy the device until after all readers are guaranteed\\nto see the new null bus.  Destroying devices before the bus is nullified\\ncould lead to use-after-free since readers expect the devices on their\\nreference of the bus to remain valid.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.37\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.4.238\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.9.238\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.200\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.148\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.66\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.8.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:45:47.418Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47061\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:45:47.418Z\", \"dateReserved\": \"2024-02-29T22:33:44.294Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T22:37:35.689Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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