314 lines
17 KiB
JSON
314 lines
17 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-2026-99216",
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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": "2026-09-25T10:25:14.401Z",
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"datePublished": "2026-10-28T10:36:09.383Z",
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"dateUpdated": "2026-10-31T12:45:15.499Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-31T12:45:15.499Z"
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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: Don't reset VMBus connection state on error/exit paths\n\nIn two places, current code forces vmbus_connection.conn_state to\nDISCONNECTED prior to calling vmbus_disconnect(). But vmbus_disconnect()\ncalls vmbus_initiate_unload(), which unloads the VMBus connection\nonly if the conn_state is CONNECTED. Consequently, the connection\nremains and the Hyper-V host might continue to send messages or post\nVMBus interrupts.\n\nThe problem was introduced in commit 74347a99e73ae (\"x86/Hyper-V:\nUnload vmbus channel in hv panic callback\"), in that\nvmbus_initiate_unload() started checking the current connection\nstate before doing the unload. This commit removed some occurrences\nwhere conn_state was forced to DISCONNECTED, but these two remained,\napparently due to an oversight at the time.\n\nFix this by not forcing conn_state to DISCONNECTED during VMBus exit,\nor if a failure occurs when establishing the connection in the first\nplace. Whatever value conn_state has at the time is then read by\nvmbus_initiate_unload() to determine if there is a connection to\nbe unloaded."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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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 attacker-controlled CHANNELMSG_VERSION_RESPONSE reaches vmbus_connect() through sysvec_hyperv_callback, vmbus_isr(), vmbus_on_msg_dpc(), and vmbus_onversion_response(); this is local Hyper-V IPC, not a network or physical protocol.\nAC:L - A backend can reject versions through 5.2, accept 5.1 in an isolation guest, then post rescind messages while the patched vmbus_connect() cleanup destroys its queues. The same backend controls both the state setup and racing messages.\nPR:N - vmbus_onversion_response() accepts the Hyper-V parent's VERSION_RESPONSE from the SynIC message page without guest credentials, capabilities, or authentication; the backend needs no privilege inside the guest.\nUI:N - hv_acpi_init() automatically calls vmbus_bus_init(), vmbus_alloc_synic_and_connect(), and vmbus_connect() during driver initialization; the backend supplies the responses without any victim action.\nS:U - The stale rescind_work_queue/work_queue accesses and resulting corruption occur within the same guest kernel that contains the vulnerable VMBus driver; no guest-to-host escape or IOMMU boundary bypass is produced.\nC:H - Without CHANNELMSG_UNLOAD, __vmbus_on_msg_dpc() can queue a rescind through a workqueue already RCU-freed by vmbus_disconnect(); this kernel heap use-after-free permits object reuse and guest-kernel memory disclosure.\nI:H - queue_work() dereferences the freed workqueue's cpu_pwq and updates pool counters and work-list state, so reuse of that storage can turn continued host messages into kernel heap writes and control-flow corruption.\nA:H - Continued rescind or offer messages can make __queue_work() access a destroyed or freed workqueue before hv_synic_cleanup() disables the SynIC, causing a warning, invalid-pointer fault, kernel oops, or panic."
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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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{
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"product": "Linux",
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"vendor": "Linux",
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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/connection.c",
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"drivers/hv/vmbus_drv.c"
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],
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"versions": [
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{
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"version": "74347a99e73ae00b8385f1209aaea193c670f901",
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"lessThan": "2939215d57bc8e4189290544fca78f3809ac3ef8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "74347a99e73ae00b8385f1209aaea193c670f901",
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"lessThan": "a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "74347a99e73ae00b8385f1209aaea193c670f901",
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"lessThan": "deef3ab5129ae4c45662c957cdab3739eb047fb1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "74347a99e73ae00b8385f1209aaea193c670f901",
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"lessThan": "2e5ffbf1e41abbf6e02ce28115107938f55ff646",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "74347a99e73ae00b8385f1209aaea193c670f901",
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"lessThan": "2732210132f92aca0622b5134027990a809279d5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "74347a99e73ae00b8385f1209aaea193c670f901",
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"lessThan": "f47ce27af80b87cc684d5c12b65506af498ac7e5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "74347a99e73ae00b8385f1209aaea193c670f901",
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"lessThan": "3195546a377c2d8d176d837e8baad5ce15d11195",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "74347a99e73ae00b8385f1209aaea193c670f901",
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"lessThan": "ec31dc39e835ccde0930daccece8c492d28282fc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5e059fc0f054309036d3f612bc8b0a502ca58545",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9f38f7b46de0747c1909e8c557aa21715dce20c5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "caeeb3787167c884b955404a7e669fd77f267e44",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4.19.118",
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"lessThan": "4.20",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.4.35",
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"lessThan": "5.5",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.6.7",
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"lessThan": "5.7",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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/connection.c",
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"drivers/hv/vmbus_drv.c"
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],
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"versions": [
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{
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"version": "5.7",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.7",
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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": "5.10.273",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.224",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.161",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.115",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.59",
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"lessThanOrEqual": "6.18.*",
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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": "7.2.13",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "5.10.273"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "7.2.13"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.4.35"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.6.7"
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/2939215d57bc8e4189290544fca78f3809ac3ef8"
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},
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{
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"url": "https://git.kernel.org/stable/c/a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304"
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},
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{
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"url": "https://git.kernel.org/stable/c/deef3ab5129ae4c45662c957cdab3739eb047fb1"
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},
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{
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"url": "https://git.kernel.org/stable/c/2e5ffbf1e41abbf6e02ce28115107938f55ff646"
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},
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{
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"url": "https://git.kernel.org/stable/c/2732210132f92aca0622b5134027990a809279d5"
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},
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{
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"url": "https://git.kernel.org/stable/c/f47ce27af80b87cc684d5c12b65506af498ac7e5"
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},
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{
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"url": "https://git.kernel.org/stable/c/3195546a377c2d8d176d837e8baad5ce15d11195"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec31dc39e835ccde0930daccece8c492d28282fc"
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}
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],
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"title": "Drivers: hv: Don't reset VMBus connection state on error/exit paths",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |