CVE-2021-47060 (GCVE-0-2021-47060)
Vulnerability from cvelistv5
Published
2024-02-29 22:37
Modified
2025-05-04 12:41
Severity ?
6.0 (Medium) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: Stop looking for coalesced MMIO zones if the bus is destroyed Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev() fails to allocate memory for the new instance of the bus. If it can't instantiate a new bus, unregister_dev() destroys all devices _except_ the target device. But, it doesn't tell the caller that it obliterated the bus and invoked the destructor for all devices that were on the bus. In the coalesced MMIO case, this can result in a deleted list entry dereference due to attempting to continue iterating on coalesced_zones after future entries (in the walk) have been deleted. Opportunistically add curly braces to the for-loop, which encompasses many lines but sneaks by without braces due to the guts being a single if statement.
References
Impacted products
Vendor Product Version
Linux Linux Version: 41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d
Version: f65886606c2d3b562716de030706dfe1bea4ed5e
Version: f65886606c2d3b562716de030706dfe1bea4ed5e
Version: f65886606c2d3b562716de030706dfe1bea4ed5e
Version: f65886606c2d3b562716de030706dfe1bea4ed5e
Version: f0dfffce3f4ffd5f822568a4a6fb34c010e939d1
Version: 840e124f89a5127e7eb97ebf377f4b8ca745c070
Version: 40a023f681befd9b2862a3c16fb306a38b359ae5
Version: 19184bd06f488af62924ff1747614a8cb284ad63
Version: 68c125324b5e1d1d22805653735442923d896a1d
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\"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47060\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-05T19:24:08.098826Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:15.638Z\"}}], \"cna\": {\"title\": \"KVM: Stop looking for coalesced MMIO zones if the bus is destroyed\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d\", \"lessThan\": \"7d1bc32d6477ff96a32695ea4be8144e4513ab2d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f65886606c2d3b562716de030706dfe1bea4ed5e\", \"lessThan\": \"2a20592baff59c5351c5200ec667e1a2aa22af85\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f65886606c2d3b562716de030706dfe1bea4ed5e\", \"lessThan\": \"168e82f640ed1891a700bdb43e37da354b2ab63c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f65886606c2d3b562716de030706dfe1bea4ed5e\", \"lessThan\": \"50cbad42bfea8c052b7ca590bd4126cdc898713c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f65886606c2d3b562716de030706dfe1bea4ed5e\", \"lessThan\": \"5d3c4c79384af06e3c8e25b7770b6247496b4417\", \"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\": \"68c125324b5e1d1d22805653735442923d896a1d\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/kvm_host.h\", \"virt/kvm/coalesced_mmio.c\", \"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\": \"5.4.119\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"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\": [\"include/linux/kvm_host.h\", \"virt/kvm/coalesced_mmio.c\", \"virt/kvm/kvm_main.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d\"}, {\"url\": \"https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85\"}, {\"url\": \"https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c\"}, {\"url\": \"https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c\"}, {\"url\": \"https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: Stop looking for coalesced MMIO zones if the bus is destroyed\\n\\nAbort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev()\\nfails to allocate memory for the new instance of the bus.  If it can\u0027t\\ninstantiate a new bus, unregister_dev() destroys all devices _except_ the\\ntarget device.   But, it doesn\u0027t tell the caller that it obliterated the\\nbus and invoked the destructor for all devices that were on the bus.  In\\nthe coalesced MMIO case, this can result in a deleted list entry\\ndereference due to attempting to continue iterating on coalesced_zones\\nafter future entries (in the walk) have been deleted.\\n\\nOpportunistically add curly braces to the for-loop, which encompasses\\nmany lines but sneaks by without braces due to the guts being a single\\nif statement.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.119\", \"versionStartIncluding\": \"5.4.66\"}, {\"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\": \"5.8.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:41:00.115Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47060\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:41:00.115Z\", \"dateReserved\": \"2024-02-29T22:33:44.294Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T22:37:34.885Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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