firmware: arm_scmi: Drop handle on protocol bind failures
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Drop handle on protocol bind failures The SCMI bus notifier acquires an SCMI handle when the driver core emits BUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe callback. The protocol probe path only checks whether sdev->handle is set. If device_link_add() fails after the handle has been acquired, the protocol device can still bind with a valid handle but without the dependency link to the SCMI parent. A concurrent parent unbind can then miss the child and tear down the SCMI instance while the child still holds a handle into it. If the protocol driver probe later fails, for example with -EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather than BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the handle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind leaked the SCMI instance users refcount and left sdev->handle set after the failed probe. Make the link helper report failure and drop the acquired handle if the link cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the same cleanup path used for unbind so failed probes balance the earlier BUS_NOTIFY_BIND_DRIVER acquisition.
CVE-2026-93084
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93084
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "971fc0665f1361f23251e4d85fac4aed1b683505",
"lessThan": "0f860db24ee95e5da4866303a35e55098b9641b3",
"versionType": "git"
},
{
"status": "affected",
"version": "971fc0665f1361f23251e4d85fac4aed1b683505",
"lessThan": "df273eced7cec550465fd1bb82a5d2c3c7d3c437",
"versionType": "git"
},
{
"status": "affected",
"version": "971fc0665f1361f23251e4d85fac4aed1b683505",
"lessThan": "a54dc23e8bd2246c28eafffa60b4634f0d1a11cc",
"versionType": "git"
},
{
"status": "affected",
"version": "971fc0665f1361f23251e4d85fac4aed1b683505",
"lessThan": "77d2985d1e80e67f32026fc03e975c4c83cc543d",
"versionType": "git"
},
{
"status": "affected",
"version": "971fc0665f1361f23251e4d85fac4aed1b683505",
"lessThan": "e3a5c30d233ca5d3e799a80da806554c703bda13",
"versionType": "git"
}
],
"programFiles": [
"drivers/firmware/arm_scmi/driver.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/firmware/arm_scmi/driver.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93084
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37818 · Revision 1
- Added to Heist Feed
- Publisher date