264 lines
12 KiB
JSON
264 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47049",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-27T18:42:55.971Z",
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"datePublished": "2024-02-28T08:13:52.168Z",
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"dateUpdated": "2026-08-05T08:45:44.180Z"
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},
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: hv: vmbus: Use after free in __vmbus_open()\n\nThe \"open_info\" variable is added to the &vmbus_connection.chn_msg_list,\nbut the error handling frees \"open_info\" without removing it from the\nlist. This will result in a use after free. First remove it from the\nlist, and then free it."
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"metrics": [
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached only over the Hyper-V guest VMBus path (__vmbus_open during channel open after a host offer/rescind), which is local hypervisor IPC rather than an IP network or physical bus attack surface.\nAC:L - A malicious Hyper-V host fully controls CHANNELMSG_OFFERCHANNEL and CHANNELMSG_RESCIND_CHANNELOFFER timing relative to guest __vmbus_open(), so it can deterministically hit the rescinded-channel error path after open_info is linked onto chn_msg_list.\nPR:N - No privileges inside the guest are required; rescind/open messages are accepted from the Hyper-V parent over VMBus with no guest authentication, matching the untrusted-host/CoCo threat model used for similar vmbus bugs.\nUI:N - Channel probe/open and rescind handling run automatically in kernel workqueues when the host sends VMBus messages; no victim user action is required.\nS:U - The UAF corrupts guest-kernel heap state (chn_msg_list / vmbus_channel_msginfo) within the same guest OS security authority; it is not a guest-to-host escape.\nC:H - Use-after-free of open_info on a globally walked list enables heap reuse and arbitrary read primitives against kernel memory.\nI:H - The same UAF is exploitable for heap spraying and control-flow hijacking / arbitrary write in the guest kernel.\nA:H - Any subsequent chn_msg_list walk over the dangling entry can oops/panic the guest kernel even without a full exploit."
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}
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]
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}
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],
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"affected": [
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/hv/channel.c"
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{
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"version": "4.13.9",
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"lessThan": "4.14",
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"status": "affected",
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"version": "0",
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},
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{
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"version": "5.10.37",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.11.21",
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"lessThanOrEqual": "5.11.*",
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"status": "unaffected",
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},
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{
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"version": "5.12.4",
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"lessThanOrEqual": "5.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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