firmware: arm_scmi: Drop handle on protocol bind failures
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.157, 6.12.110, 6.18.52, 7.2.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 971fc0665f1361f23251e4d85fac4aed1b683505 · fixed in 0f860db24ee95e5da4866303a35e55098b9641b3; From 971fc0665f1361f23251e4d85fac4aed1b683505 · fixed in df273eced7cec550465fd1bb82a5d2c3c7d3c437; From 971fc0665f1361f23251e4d85fac4aed1b683505 · fixed in a54dc23e8bd2246c28eafffa60b4634f0d1a11cc; From 971fc0665f1361f23251e4d85fac4aed1b683505 · fixed in 77d2985d1e80e67f32026fc03e975c4c83cc543d; From 971fc0665f1361f23251e4d85fac4aed1b683505 · fixed in e3a5c30d233ca5d3e799a80da806554c703bda13
- Linux Linux
6.3
- KernelLinux
From 6.3.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6