Drivers: hv: Don't reset VMBus connection state on error/exit paths

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99216
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:43 UTC
Updated2026-10-31 13:17:59 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001710000 probability, percentile 0.064400000 (date 2026-10-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 74347a99e73ae00b8385f1209aaea193c670f901 2939215d57bc8e4189290544fca78f3809ac3ef8 git Not specified
CNA Linux Linux affected 74347a99e73ae00b8385f1209aaea193c670f901 a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304 git Not specified
CNA Linux Linux affected 74347a99e73ae00b8385f1209aaea193c670f901 deef3ab5129ae4c45662c957cdab3739eb047fb1 git Not specified
CNA Linux Linux affected 74347a99e73ae00b8385f1209aaea193c670f901 2e5ffbf1e41abbf6e02ce28115107938f55ff646 git Not specified
CNA Linux Linux affected 74347a99e73ae00b8385f1209aaea193c670f901 2732210132f92aca0622b5134027990a809279d5 git Not specified
CNA Linux Linux affected 74347a99e73ae00b8385f1209aaea193c670f901 f47ce27af80b87cc684d5c12b65506af498ac7e5 git Not specified
CNA Linux Linux affected 74347a99e73ae00b8385f1209aaea193c670f901 3195546a377c2d8d176d837e8baad5ce15d11195 git Not specified
CNA Linux Linux affected 74347a99e73ae00b8385f1209aaea193c670f901 ec31dc39e835ccde0930daccece8c492d28282fc git Not specified
CNA Linux Linux affected 5e059fc0f054309036d3f612bc8b0a502ca58545 git Not specified
CNA Linux Linux affected 9f38f7b46de0747c1909e8c557aa21715dce20c5 git Not specified
CNA Linux Linux affected caeeb3787167c884b955404a7e669fd77f267e44 git Not specified
CNA Linux Linux affected 4.19.118 4.20 semver Not specified
CNA Linux Linux affected 5.4.35 5.5 semver Not specified
CNA Linux Linux affected 5.6.7 5.7 semver Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.161 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.115 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2e5ffbf1e41abbf6e02ce28115107938f55ff646 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3195546a377c2d8d176d837e8baad5ce15d11195 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/deef3ab5129ae4c45662c957cdab3739eb047fb1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f47ce27af80b87cc684d5c12b65506af498ac7e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec31dc39e835ccde0930daccece8c492d28282fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2732210132f92aca0622b5134027990a809279d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2939215d57bc8e4189290544fca78f3809ac3ef8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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