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CVE-2026-93086

Unknown

Last modified

CVE-2026-93086 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Avoid IDR updates while cleaning channels scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy(). The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state.

Description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Avoid IDR updates while cleaning channels scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy(). The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state. The callback also cannot be protected by rcu_read_lock(), because scmi_device_destroy() may sleep. Leave IDR teardown to the following idr_destroy() call and keep the callback limited to device destruction.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < aed24a3c63920539e9de7fbfe7929a2e7c888cd2; >= 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < 431c6b872ba7fedcc5a3afb0ec3517db4d95d088; >= 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < 54e5a4f7d83db4552d963d0785be32d9df680dcd; >= 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < bab26acebe55e8ad3ab545abda72faa7ca28c477; >= 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < c38b1e19485aaa820e52cfe162525a8af67563da
LinuxLinux6.3

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-93086?
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Avoid IDR updates while cleaning channels scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy(). The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state. The callback also cannot be protected by rcu_read_lock(), because scmi_device_destroy() may sleep. Leave IDR teardown to the following idr_destroy() call and keep the callback limited to device destruction.
How severe is CVE-2026-93086?
Severity scoring for CVE-2026-93086 is pending analysis.
How do I fix CVE-2026-93086?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST