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CVE-2026-99216— Drivers: hv: Don't reset VMBus connection state on error/exit paths

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： 驱动程序：hv：在错误路径或退出路径中，不再将 VMBus 连接状态重置为“已断开”。 在两个位置，当前代码在调用 之前，强制将 设置为 。然而， 会调用 ，而该函数仅在 为 时才会卸载 VMBus 连接。因此，连接实际上并未被卸载，Hyper-V 主机可能会继续发送消息或触发 VMBus 中断。 该问题由提交 74347a99e73ae（"x86/Hyper-V：在 hv panic 回调中卸载 vmbus 通道”）引入。在该提交中， 开始在卸载前检查当前连接状态。该

AI Predicted 5.5 Difficulty: Hard EPSS 0.16% · P5

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 74347a99e73ae00b8385f1209aaea193c670f901< f47ce27af80b87cc684d5c12b65506af498ac7e5 affected
74347a99e73ae00b8385f1209aaea193c670f901< 3195546a377c2d8d176d837e8baad5ce15d11195 affected
74347a99e73ae00b8385f1209aaea193c670f901< ec31dc39e835ccde0930daccece8c492d28282fc affected
5e059fc0f054309036d3f612bc8b0a502ca58545 affected
9f38f7b46de0747c1909e8c557aa21715dce20c5 affected
caeeb3787167c884b955404a7e669fd77f267e44 affected
4.19.118< 4.20 affected
5.4.35< 5.5 affected
… +6 more rows
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I. Basic Information for CVE-2026-99216

Vulnerability Information
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Vulnerability Title
Drivers: hv: Don't reset VMBus connection state on error/exit paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: Don't reset VMBus connection state on error/exit paths In two places, current code forces vmbus_connection.conn_state to DISCONNECTED prior to calling vmbus_disconnect(). But vmbus_disconnect() calls vmbus_initiate_unload(), which unloads the VMBus connection only if the conn_state is CONNECTED. Consequently, the connection remains and the Hyper-V host might continue to send messages or post VMBus interrupts. The problem was introduced in commit 74347a99e73ae ("x86/Hyper-V: Unload vmbus channel in hv panic callback"), in that vmbus_initiate_unload() started checking the current connection state before doing the unload. This commit removed some occurrences where conn_state was forced to DISCONNECTED, but these two remained, apparently due to an oversight at the time. Fix this by not forcing conn_state to DISCONNECTED during VMBus exit, or if a failure occurs when establishing the connection in the first place. Whatever value conn_state has at the time is then read by vmbus_initiate_unload() to determine if there is a connection to be unloaded.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 74347a99e73ae00b8385f1209aaea193c670f901 ~ f47ce27af80b87cc684d5c12b65506af498ac7e5 -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-99216

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III. Intelligence Information for CVE-2026-99216

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Patches & Fixes for CVE-2026-99216 (3)

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99129 selinux: fix BPF token permission checks
CVE-2026-99130 io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131 xfs: fix capability check in xfs
CVE-2026-99133 net/iucv: fix the recvmsg window update
CVE-2026-99132 xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134 mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135 dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137 cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136 dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140 tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141 tracing: Fix crash in print_graph_function_event()
CVE-2026-99142 tracing: Check operator stack capacity before pushing
CVE-2026-99154 scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151 drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
CVE-2026-99153 scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152 scsi: libiscsi: Validate the task named by a management response
CVE-2026-99150 drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

Showing top 20 of 117 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux